Efficient Sulphuric Acid Pump for Agrochemical Manufacturing

Sulphuric Acid Pumps Engineered for Agrochemical Operations

Sulphuric acid pump systems designed specifically for agrochemical processing represent a critical intersection of chemical engineering and industrial reliability. These pumps handle one of the most widely used industrial chemicals on the planet, transferring sulphuric acid at various concentrations through fertilizer production lines, pesticide synthesis reactors, and soil amendment facilities. Unlike general-purpose chemical pumps, agrochemical-grade sulphuric acid pumps must contend with unique operational demands: continuous duty cycles during peak agricultural seasons, exposure to varying acid concentrations from dilute 10% solutions up to concentrated 98% grades, and the presence of abrasive particulates that can accelerate wear on internal pump components. The agrochemical sector depends on these pumps for the uninterrupted production of phosphate fertilizers, ammonium sulphate, and numerous crop protection chemicals that sustain global food production.

The engineering behind modern sulphuric acid pumps for agrochemicals incorporates advanced materials science and precision manufacturing to deliver leak-proof, corrosion-resistant performance across thousands of operating hours. Magnetic drive technology eliminates traditional mechanical seals, removing the single most common failure point in chemical transfer pumps. Polypropylene, PVDF, and Kynar housings provide exceptional resistance to sulphuric acid attack at varying temperatures, while carefully selected elastomers such as Viton ensure long-term sealing integrity. Every component from the impeller to the casing is selected based on the specific acid concentration, operating temperature, and flow requirements of the target agrochemical process. This application-specific engineering approach ensures that agrochemical plants achieve maximum uptime, minimal maintenance costs, and complete containment of hazardous fluids throughout the production cycle.

The range of available pump configurations spans from compact magnetic drive units delivering 5 GPM for laboratory and pilot-scale agrochemical synthesis, to robust industrial pumps moving 200 GPM or more through full-scale fertilizer manufacturing lines. Each pump is built with the understanding that sulphuric acid is not merely corrosive: it is also dense, with specific gravity values that can exceed 1.8 at high concentrations. This density demands careful impeller trimming, appropriate motor sizing, and precise hydraulic balancing to prevent decoupling in magnetic drive designs or motor overload in direct-drive configurations. The result is a pump category that combines chemical inertness, mechanical durability, and energy efficiency in a single reliable package purpose-built for the agrochemical industry's most demanding acid handling applications.

Why Agrochemical Processing Demands Specialized Sulphuric Acid Pumps

Standard industrial pumps fail rapidly when exposed to the aggressive chemical environment found in agrochemical sulphuric acid service. The combination of acid corrosion, elevated temperatures, and continuous operation creates a punishing duty cycle that exposes every weakness in pump design and material selection. Sulphuric acid is hygroscopic, meaning it actively draws moisture from the atmosphere and from the materials it contacts, which can accelerate the degradation of metallic pump components through hydrogen embrittlement and stress corrosion cracking. In agrochemical fertilizer production, the acid often carries dissolved minerals and phosphate rock particulates that act as abrasives, eroding impeller vanes and wearing down casing walls. A pump not specifically engineered for these conditions may survive only weeks or months before catastrophic failure leads to costly production downtime, environmental release risks, and worker safety hazards.

The concentration-temperature matrix of sulphuric acid presents a unique material selection challenge that demands specialized pump engineering. At concentrations below 70% and ambient temperatures, sulphuric acid is aggressively corrosive to carbon steel and most stainless steels, requiring non-metallic materials such as polypropylene or PVDF. At concentrations above 93%, the oxidizing nature of the acid allows certain stainless steels like 316L and specialty alloys such as 904 to form a protective passive layer, making metallic pumps viable again. However, agrochemical processes frequently operate across multiple concentration ranges within the same facility: dilute acid for pH adjustment in one area, concentrated acid for phosphate rock digestion in another. This variability means that a one-size-fits-all pump approach is fundamentally incompatible with agrochemical operational realities. Each pump installation must be specified based on its exact service conditions, with material selections validated against the acid concentration and temperature extremes expected during normal operation, startup, and shutdown cycles.

Beyond material compatibility, the agrochemical industry imposes additional demands that elevate the need for specialized pump designs. Continuous production schedules during pre-planting and growing seasons require pumps that can operate 24 hours per day, 7 days per week, without unscheduled maintenance interruptions. The financial impact of a pump failure during peak fertilizer production season can exceed hundreds of thousands of dollars in lost output and contractual penalties. Furthermore, agrochemical facilities are increasingly subject to stringent environmental regulations governing fugitive emissions and chemical containment. Sealless magnetic drive pumps address this requirement by eliminating the mechanical seal, which is the primary leak path in conventional centrifugal pump designs. This zero-emission capability is not merely a desirable feature; in many modern agrochemical plants, it is a regulatory requirement for acid handling equipment located near plant boundaries or sensitive environmental receptors.

Core Applications of Sulphuric Acid Pumps Across Agrochemical Manufacturing

Sulphuric acid pumps serve as the circulatory backbone of modern agrochemical facilities, enabling the precise transfer, dosing, and recirculation of acid across multiple production stages. The single largest application is in phosphate fertilizer manufacturing, where concentrated sulphuric acid is used to digest phosphate rock in a process known as the wet acid route. Large magnetic drive or mechanically sealed centrifugal pumps transfer 93-98% sulphuric acid from storage tanks into attack tanks where it reacts with ground phosphate rock to produce phosphoric acid and gypsum. The pump must handle the acid's high specific gravity, often exceeding 1.84, without decoupling in mag-drive configurations or stalling direct-drive motors. Flow rates in these applications typically range from 100 to 500 GPM, with pumps operating continuously for weeks at a time during peak production campaigns that align with pre-planting fertilizer demand spikes.

Beyond bulk acid transfer, these pumps play a critical role in ammonium sulphate production, where sulphuric acid is reacted with ammonia in saturator vessels to produce one of the world's most widely used nitrogen-sulphur fertilizers. The pump circulates the acid through heat exchangers and spray nozzles, maintaining precise pH control that directly influences crystal size distribution and final product quality. In pesticide and herbicide synthesis, sulphuric acid acts as a catalyst and dehydrating agent in the production of active ingredients such as glyphosate intermediates, 2,4-D esters, and various organophosphate compounds. These fine chemical applications demand low-flow, high-head pumps capable of delivering acid with exceptional accuracy and pulsation-free flow characteristics, often achieved through magnetically coupled gear pumps or sealless turbine pumps constructed from PVDF or ETFE for maximum corrosion resistance at elevated temperatures.

Sulphuric acid pumps also find extensive use in agrochemical wastewater treatment and acid recovery systems. Spent acid from nitration processes, metal pickling operations within fertilizer plants, and reactor cleanouts must be transferred to neutralization basins or regeneration units. Pumps in this service encounter acid contaminated with organic residues, dissolved metals, and fine particulates, demanding robust designs with wide internal clearances and abrasion-resistant impellers. Many facilities now incorporate acid dilution and pH adjustment loops where pumps meter precise quantities of 98% acid into process water to produce dilute solutions for soil amendment injection systems and fertigation applications. This versatility across concentration ranges, from oleum-strength acid to 10% dilute solutions, demonstrates the pump's critical importance throughout the entire agrochemical value chain.

• Phosphate Rock Digestion: Pumps transfer 93-98% concentrated sulphuric acid into attack tanks where it reacts with phosphate rock to produce phosphoric acid, the foundational step in manufacturing diammonium phosphate (DAP), monoammonium phosphate (MAP), and triple superphosphate (TSP) fertilizers.
• Ammonium Sulphate Crystallization: Sulphuric acid pumps circulate acid through ammonia-sparged saturators, maintaining a precise pH environment that controls crystal nucleation and growth rates for granular ammonium sulphate fertilizer used on sulfur-deficient soils worldwide.
• Pesticide Active Ingredient Synthesis: Metering pumps deliver precise volumes of sulphuric acid as a catalyst or dehydrating agent in the synthesis of organophosphate insecticides, phenoxy herbicides, and carbamate fungicides, where acid purity and flow consistency directly impact reaction yield.
• Acid Dilution and pH Adjustment: Specialized metering pumps blend concentrated acid with process water in controlled ratios to produce dilute sulphuric acid solutions for soil pH correction, fertigation systems, and microirrigation acid injection, requiring high turndown capability and chemical-resistant wetted ends.
• Sulphonation Reactor Circulation: In the production of sulphonated agrochemical surfactants and wetting agents, pumps recirculate sulphuric acid through jacketed reactors, maintaining temperature uniformity and mass transfer that prevents localized overheating and product degradation.
• Spent Acid Recovery and Regeneration: Pumps transfer spent sulphuric acid contaminated with organic byproducts and metal salts from agrochemical reaction vessels to regeneration plants, where the acid is purified and reconcentrated for reuse, reducing fresh acid consumption and waste disposal costs.
• Scrubber and Off-Gas Treatment: Pumps circulate dilute sulphuric acid through packed bed scrubbers to neutralize ammonia and amine vapors from fertilizer granulation plants, protecting downstream air pollution control equipment and ensuring compliance with emission limits.

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Key Features of Sulphuric Acid Pumps for Agrochemical Service

Modern sulphuric acid pumps purpose-built for the agrochemical industry incorporate a suite of engineering features that collectively deliver unparalleled reliability, safety, and operational efficiency. The cornerstone of advanced pump design is the magnetic drive technology, which completely isolates the process fluid from the atmosphere by replacing the traditional dynamic mechanical seal with a static containment shell. This eliminates the most common leak path in conventional centrifugal pumps, where seal faces can wear, crack, or misalign due to thermal cycling, acid crystallization, or particulate ingress. The static shell, typically constructed from thick-walled polypropylene, PVDF, or fluoropolymer-lined steel, provides a hermetic barrier that prevents fugitive acid emissions entirely. This not only protects plant personnel and the environment from exposure to hazardous acid vapors but also eliminates the maintenance burden of replacing mechanical seal components, which can account for up to 70% of conventional pump repair costs in aggressive chemical service.

Material innovation represents another defining feature of these specialized pumps. Wetted components are available in a range of engineered thermoplastics and fluoropolymers, each offering distinct advantages for specific acid concentration and temperature combinations. Polypropylene (PP) provides economical corrosion resistance for dilute to medium acid concentrations up to 180°F, while PVDF (polyvinylidene fluoride) extends the temperature capability to 250°F with superior resistance to chemical attack across a broader spectrum of agrochemical process fluids. For the most demanding applications involving high-purity acid or elevated temperatures, wetted parts manufactured from Kynar, ETFE, or PFA offer near-universal chemical inertness. In metallic pump designs suitable for concentrated sulphuric acid (93-98%) at ambient temperatures, specialty alloys such as 316L stainless steel, Alloy 20, and Hastelloy C-276 provide the passive film stability necessary to resist the acid's oxidizing nature. Impellers are precision-molded with closed, semi-open, or recessed vortex geometries to handle clear liquids, crystallizing solutions, and solids-laden slurries without clogging or performance degradation.

• Sealless Magnetic Drive Technology: The hermetically sealed design eliminates mechanical seals, packing, and dynamic O-rings that are prone to acid attack, ensuring zero process fluid leakage and reducing annual maintenance costs by up to 60% compared to conventionally sealed pumps.
• Sealless Magnetic Drive Technology: The hermetically sealed design eliminates mechanical seals, packing, and dynamic O-rings that are prone to acid attack, ensuring zero process fluid leakage and reducing annual maintenance costs by up to 60% compared to conventionally sealed pumps.
• Advanced Non-Metallic Wetted Components: All fluid-contact parts are available in polypropylene, PVDF, Kynar, or ETFE, providing superior corrosion resistance across acid concentrations from 10% to 98% and temperatures up to 250°F without the passivation instability that plagues metallic alloys in dilute acid service.
• High-Torque Neodymium Magnetic Coupling: Rare-earth magnet assemblies transmit power across the containment shell without slip or decoupling, even at fluid specific gravities exceeding 1.8, ensuring reliable transfer of dense sulphuric acid in phosphate fertilizer reactors and attack tank recirculation loops.
• Abrasion-Resistant Impeller Designs: Semi-open and recessed vortex impellers handle phosphate rock particles, gypsum crystals, and catalyst fines without clogging, while closed impellers with hardened wear rings provide maximum efficiency for clean acid transfer applications across agrochemical plants.
• Dry-Run Protection Capability: Composite wear rings and specialized bearing materials allow limited dry-run operation without catastrophic failure, protecting the pump during process upsets, tank level fluctuations, or operator errors that can occur in agrochemical batch manufacturing environments.
• Thermally Stable Containment Shell: The thick-walled static barrier is designed to withstand thermal shock from acid dilution exotherms and rapid temperature changes during reactor charge cycles, preventing cracking or deformation that could compromise the hermetic seal.
• Low NPSH Requirement Hydraulics: Optimized suction geometries allow the pump to operate with minimal net positive suction head, enabling safe transfer of sulphuric acid from atmospheric storage tanks and railcar unloading stations without cavitation damage in hot agrochemical process environments.

Technical Specifications for Agrochemical-Grade Sulphuric Acid Pumps

The technical performance envelope of agrochemical sulphuric acid pumps spans a broad range to accommodate every application from pilot plant synthesis to full-scale fertilizer manufacturing. Flow capacities typically range from 2 GPM for laboratory-scale metering pumps to over 500 GPM for bulk transfer and reactor circulation duties. Total dynamic head capabilities reach up to 320 feet (140 PSI) in single-stage configurations, with multi-stage designs available for processes requiring higher discharge pressures such as spray dryer feed, high-pressure reactor injection, and long-distance acid pipeline transfer. Motor power ratings are selected based on the acid's high specific gravity, with standard motor sizes from 0.5 HP to 75 HP, and premium high-efficiency TEFC or explosion-proof motor options for hazardous-area classifications commonly found in solvent-based agrochemical processing buildings. Every pump is hydraulically trimmed and magnetically balanced at the factory to ensure the drive coupling remains locked across the full operating range, preventing the decoupling that can occur when undersized magnets are paired with dense fluids like concentrated sulphuric acid.

Material construction specifications are strictly controlled to ensure chemical compatibility across the widest possible range of agrochemical processes. Standard casing and impeller materials include glass-filled polypropylene for economical dilute acid service up to 180°F, unfilled PVDF for high-purity acid handling up to 250°F with exceptional mechanical strength retention, and carbon-filled ETFE for applications requiring simultaneous resistance to sulphuric acid and aromatic solvents commonly used in pesticide formulation. The containment shell, which serves as the primary safety barrier, is manufactured from a minimum of 3/16-inch thick PVDF or metallic materials with integral fluoropolymer liners, depending on the pump size and pressure rating. O-ring materials are supplied in Viton A, EPDM, or Kalrez perfluoroelastomer based on the specific acid concentration, temperature, and the potential presence of solvent contaminants that can cause swelling in standard elastomers. Bearing materials utilize silicon carbide or carbon-graphite against ceramic or tungsten carbide mating surfaces, selected to provide dry-run tolerance and extended service life in the marginal lubrication conditions that characterize high-temperature sulphuric acid pumping.

• Flow Rate Range: Available from 2 GPM to 550 GPM in standard models, covering the entire spectrum of agrochemical needs from precise metering for active ingredient synthesis to high-volume phosphate rock digestion acid transfer at rates exceeding 400 GPM.
• Maximum Discharge Head: Single-stage designs deliver up to 320 feet TDH, while multi-stage configurations push heads beyond 600 feet for long-distance transfer, high-pressure reactor feed, and acid injection into pressurized ammonia saturator vessels.
• Operating Temperature Range: Pumps are rated from -4°F to 250°F depending on material selection, with PVDF and ETFE constructions handling the highest temperature duties typical of exothermic sulphonation and esterification reactions in agrochemical synthesis.
• Maximum System Pressure: Standard casings are rated for 150 PSI (PN10) working pressure, with high-pressure variants available up to 230 PSI (PN16) for applications involving tall vertical lift, backpressure from downstream equipment, or high-density acid service.
• Suction Lift Capability: Self-priming designs achieve suction lifts up to 16 feet when equipped with integral priming chambers, enabling top-mount installations on acid storage tanks and railcar unloading sumps without the need for foot valves that can become corroded and fail.
• Viscosity and Specific Gravity Compensation: The magnetic coupling is sized to handle fluid densities up to 2.0 g/cm³ with a minimum safety factor of 1.5 against decoupling, ensuring reliable power transmission even when handling concentrated 98% sulphuric acid at its maximum specific gravity of 1.84 without requiring oversized motors.
• Motor and Drive Options: Standard IEC and NEMA frame motors are available in TEFC, explosion-proof (ATEX/IECEx), and inverter-duty configurations, with direct-drive tight-coupled designs eliminating alignment issues and belt-drive options providing speed flexibility for process optimization in agrochemical plants.
• Particle Handling Capacity: Recessed impeller designs pass solids up to 1.5 inches in diameter without clogging, enabling reliable transfer of acid slurries containing phosphate rock residue, catalyst fines, and crystallization scale that would stall conventional closed-impeller pumps.

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Material Compatibility: Selecting the Right Pump for Your Acid Concentration

Material selection is the single most critical decision in specifying a sulphuric acid pump for agrochemical service. The corrosion behavior of sulphuric acid changes dramatically with concentration and temperature, creating distinct material compatibility zones that must be respected. In the concentration range below 70% at ambient and moderately elevated temperatures, the acid is aggressively reducing and will rapidly attack most metallic materials including carbon steel, 316 stainless steel, and even many higher-alloyed stainless steels. This region demands non-metallic pump construction: polypropylene (PP) provides excellent resistance to dilute sulphuric acid up to approximately 180°F, offering an economical solution for applications such as pH adjustment dosing, scrubber recirculation, and dilute acid transfer. Polyvinylidene fluoride (PVDF) extends the temperature capability to 220-250°F with enhanced chemical resistance and superior mechanical strength, making it the material of choice for moderate concentration acid transfer and reactor circulation loops in pesticide intermediate synthesis where exotherms can elevate fluid temperatures above the limits of polypropylene.

At concentrations above 93%, sulphuric acid becomes strongly oxidizing, forming a protective sulfate layer on the surface of certain stainless steels that renders them effectively passive. Alloy 316L exhibits adequate corrosion resistance to 93-98% acid at temperatures up to approximately 100°F, making it a viable material for ambient-temperature transfer of concentrated acid from storage to phosphate rock reaction vessels. However, the elevated temperatures encountered in many agrochemical processes – particularly the heat generated by acid dilution and exothermic reactions – can destabilize this passive film, leading to rapid localized attack. Alloy 20 (Carpenter 20) provides improved resistance with higher molybdenum and nickel content, while Hastelloy C-276 offers the broadest corrosion resistance across both oxidizing and reducing acid environments. These specialty alloys are important for pumps serving dual-purpose applications where acid concentration may cycle through both oxidizing and reducing regimes. For the most demanding and temperature-elevated concentrated acid services, fluoropolymer-lined metallic pumps combine the structural strength of a metal casing with the universal chemical inertness of PFA or ETFE linings, providing a robust solution for continuous high-temperature 98% acid recirculation in fertilizer plants.

• Polypropylene (PP): Suitable for acid concentrations from 0-60% up to 180°F. Economical, readily available, and resistant to most agrochemical process streams. Not recommended for highly oxidizing concentrated acid or aromatic solvent co-contamination common in pesticide synthesis.
• PVDF (Polyvinylidene Fluoride): Handles acid concentrations up to 98% at ambient temperatures and up to 90% at temperatures reaching 250°F. Its low extractables profile makes it ideal for applications where acid purity must be maintained to avoid catalyst poisoning in fine agrochemical reactions.
• ETFE and PFA (Fluoropolymers): Offer near-universal chemical inertness across the entire sulphuric acid concentration range and temperature up to 300°F. Used as lining materials on metallic pump casings or as solid-molded wetted components for the most aggressive acid solvent mixture duties.
• 316L Stainless Steel: Acceptable for 93-98% concentrated acid at temperatures below 100°F with low velocity (under 5 fps). The passive layer is fragile and can fail if acid dilution occurs, making it risky for applications with concentration variability in agrochemical multi-purpose plants.
• Alloy 20 (Carpenter 20): Provides reliable resistance to 93-98% acid at temperatures up to 150°F and resists intergranular corrosion better than 316L. Often selected for hot concentrated acid transfer in phosphate fertilizer attack tank recirculation where process temperatures can exceed ambient by 50-80°F.
• Hastelloy C-276: The premium solution for variable acid concentration service, handling both oxidizing and reducing environments. Used in critical pump components (shafts, wear rings) and for multi-purpose reactor feed pumps that must switch between concentrated and dilute acid operations without material change.
• Elastomer Seal Materials: Viton (FKM) for general dilute acid service up to 200°F, EPDM for compatibility with solvent-free acid streams, and Kalrez for high-temperature concentrated acid or applications involving organic solvent co-contamination that could swell standard elastomers.

Sulphuric Acid Pump Selection Guide for Agrochemicals

Selecting the correct sulphuric acid pump for an agrochemical application requires a systematic evaluation of process conditions, fluid characteristics, and operational requirements. The selection process begins with a precise definition of the acid concentration range the pump will encounter, including any transient conditions during startup, shutdown, and process upsets. A pump handling primarily 98% concentrated acid for phosphate rock digestion may experience significant dilution during flushing cycles or when feeding auxiliary processes, creating corrosion hazards if metallic materials were selected based solely on concentrated acid compatibility. The fluid temperature profile is equally critical, as the corrosion rate of most materials doubles for every 18°F increase in temperature. Agrochemical processes frequently generate exothermic heat during acid dilution and reaction steps, making it essential to specify pumps based on maximum operating temperature, not just normal steady-state conditions. Additional fluid properties including specific gravity, viscosity, and the presence of abrasive solids (such as phosphate rock fines, gypsum crystals, or activated carbon from decolorization steps) directly influence impeller geometry, motor sizing, and magnetic coupling torque requirements.

Beyond fluid compatibility, the selection process must account for the specific agrochemical process function the pump will perform. Continuous bulk transfer pumps operating 24 hours per day during peak fertilizer production campaigns require different design priorities than intermittent metering pumps used for batch-wise pesticide synthesis. Bulk transfer applications prioritize efficiency, low NPSH requirements for safe tank unloading, and large solids-handling capability. Metering applications demand precise flow control, linear pump curves, and pulsation-dampened discharge for consistent reaction stoichiometry. The pump's hydraulic configuration (end suction, self-priming, vertical cantilever, or close-coupled) must be matched to the available footprint, suction source configuration, and net positive suction head available. Installation factors such as hazardous area classification, ambient temperature extremes in outdoor agrochemical storage areas, and accessibility for maintenance also influence the final pump specification. A pump that is chemically compatible but physically inaccessible for routine bearing inspection or magnetic coupling monitoring will eventually cause operational headaches.

• Define the Acid Concentration Range: Document the minimum, normal, and maximum acid concentrations the pump will experience, including dilution during line flushing and upsets. This determines whether non-metallic, stainless steel, or exotic alloy construction is required.
• Establish Maximum and Minimum Operating Temperatures: Include heat from exothermic reactions, pump recirculation heating, and ambient solar radiation on outdoor storage tanks. Select materials with adequate corrosion resistance at the upper temperature limit, not just at ambient conditions.
• Calculate Required Flow Rate and Total Dynamic Head: Perform hydraulic calculations accounting for the acid's elevated specific gravity (1.4-1.84) which significantly increases power consumption and reduces pump head relative to water performance curves. Size the pump for the best efficiency point (BEP) at normal flow, with adequate margin for maximum demand.
• Assess Solids Content and Abrasion Potential: Determine if the acid stream contains phosphate rock residue, gypsum scale, or catalyst particles. If solids exceed 1% by weight or particle sizes exceed 100 microns, select semi-open or recessed vortex impellers to prevent clogging and reduce wear.
• Evaluate Available Net Positive Suction Head (NPSHa): Sulphuric acid's density reduces NPSHa compared to water. For hot, concentrated acid near its vapor pressure, carefully calculate NPSHa and select pump designs with low NPSHr requirements to prevent cavitation damage to impellers and containment shell.
• Consider Containment Requirements and Emission Controls: If the pump must meet zero-fugitive-emission standards, magnetic drive sealless designs are mandatory. Ensure the containment shell material is compatible with acid concentration and temperature, and that secondary containment provisions are available for drain connections.
• Review Utility and Space Constraints: Check motor voltage and hazardous area classification (Zone 1 vs Zone 2) to specify TEFC, explosion-proof, or flameproof motors. Verify that pump dimensions fit within existing pipe racks, and that maintenance access for magnetic coupling inspection or impeller removal is adequate.
• Validate Material Compatibility with Process Additives: Many agrochemical processes use sulphuric acid in combination with solvents, surfactants, or other acids. Ensure that wetted elastomers (O-rings, gaskets) and plastics are resistant to all chemical components, not just sulphuric acid alone, to prevent swelling, cracking, or catastrophic seal failure.