| HS Code | 692855 |
| Product Name | Sulfuric Acid-Hydrogen Peroxide Mixture (SPM) |
| Grade | Electronic/EL Grade |
| Chemical Composition | Mixture of sulfuric acid (H2SO4) and hydrogen peroxide (H2O2), typically 3:1 volume ratio |
| Appearance | Clear colorless liquid |
| Physical State | Liquid |
| Odor | Pungent sharp odor |
| Density | Approximately 1.6 g/cm3 |
| Specific Gravity | Approximately 1.6 at 20°C |
| Boiling Point | Approximately 140°C with decomposition |
| Vapor Pressure | Low |
| Viscosity | Similar to concentrated sulfuric acid, approximately 1.5 to 2.0 cP |
| Ph | Less than 1 |
| Acidity | Strongly acidic |
| Oxidative Property | Strong oxidizing agent due to hydrogen peroxide content |
| Corrosiveness | Highly corrosive to metals, skin, and eye tissue |
| Miscibility | Fully miscible with water |
| Thermal Stability | Unstable when heated; decomposes exothermically |
| Flash Point | Non-flammable but supports combustion of organic materials |
As an accredited Sulfuric Acid-Hydrogen Peroxide Mixture (SPM) Electronic/EL Grade factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Packaged in 4 L clean HDPE jerrican with double-sealed cap, nitrogen blanketing, and outer polybag to maintain electronic-grade purity. |
| Container Loading (20′ FCL) | 20′ FCL loading of SPM (Electronic/EL Grade) uses dedicated, clean IBCs/drums, with secure bracing, segregation, and hazmat-compliant packaging for safe transport. |
| Shipping | Sulfuric Acid-Hydrogen Peroxide Mixture (SPM), Electronic/EL Grade, ships as UN 3149, Class 5.1/8, corrosive oxidizer. Pack in vented, compatible fluoropolymer-lined or HDPE containers, stabilized and kept cool. Segregate from combustibles, metals, and reducing agents. Requires hazardous-material labeling, trained handlers, and leak-proof secondary containment. Handle with appropriate PPE. |
| Storage | Store SPM in clean, sealed HDPE or PTFE containers with pressure-relieving vents. Keep in a cool, dry, well-ventilated area away from sunlight, heat, organics, and incompatible chemicals. Maintain temperatures below 25°C. Use secondary containment to catch leaks. Because SPM is unstable, prepare fresh and never store for extended periods. Label clearly with date and hazards. |
| Shelf Life | Shelf life is typically 6 months from manufacture when stored sealed, cool, and away from light and contaminants. |
On 300 mm front-end logic and memory production lines, SPM is used immediately after dry etch and ion implantation to remove positive deep-ultraviolet photoresist and organic residues. The mixture is generated by combining electronic-grade 96 wt% H₂SO₄ with 31 wt% H₂O₂ at a volumetric ratio between 3:1 and 4:1; the exothermic mixing reaction increases bath or spray temperature to the setpoint of 120–130 °C in single-wafer spin processors. In a typical 300 mm spray chamber, dispense rates of 0.5–1.5 L/min and rotational speeds of 500–1200 rpm are maintained for 60–120 s, depending on resist thickness and post-etch residue loading. The oxidant decomposes organic film components through carbon-carbon bond cleavage and converts carbon-rich residues into CO₂ and water-soluble species. Mixing protocol requires slow addition of H₂O₂ to H₂SO₄ under recirculation; reverse addition can generate a steam-oxidizer spray. Endpoint monitoring is routinely performed by optical inspection or temperature-corrected concentration control; bath-type operations rely on spiking H₂O₂ to sustain greater than 90 % of initial oxidizer concentration. Metal-grade control follows SEMI C30-0618 for hydrogen peroxide and SEMI C22 for sulfuric acid, with per-metal cation results typically reported at ≤0.1 ppb for Cu, Fe, Ni, and Zn. SPM from this application segment is not a post-etch residue remover for inorganic metal oxides or fluorinated residues; wafers are transferred to an SC1 step at 1:1:5 NH₄OH/H₂O₂/H₂O and an SC2 step at 1:1:6 HCl/H₂O₂/H₂O to cover particle and metal removal. Process excursions above 150 °C accelerate H₂O₂ decomposition and can increase silicon oxide attack, so temperature control is bounded by the specific tool recipe.
High-dose implants at >5E15 atoms/cm² create a dehydrogenated, cross-linked crust on top of photoresist that resists conventional solvent stripping. In these process sequences, plasma ashing is used to remove the carbonized shell before SPM is applied; SPM then dissolves the remaining bulk resist and organic byproducts. Batch immersion in quartz tanks with external heating and nitrogen purging is preferred for 200 mm and 300 mm wafer groups. A typical recipe uses H₂SO₄:H₂O₂ at 4:1, bath temperature 130 °C, and immersion time 10–20 min. The process window is narrow because crust residues may delaminate as thick flakes and deposit on wafer surfaces if the initial ash step is incomplete. On high-volume lines, gas evolution from peroxide decomposition and CO₂ generation leads to foaming; the tank must be equipped with continuous exhaust and liquid-level controls. The same SPM step after high-dose implant also removes organic contaminants from the wafer edge and backside, but does not remove implanted elemental contaminants. Subsequent SC1 and SC2 cleans are required before gate oxide growth. Evidence from high-volume lines shows batch-to-batch variation in resist strip time when H₂O₂ storage temperature exceeds 35 °C and stabilizer is consumed; therefore, material is replenished from sealed, refrigerated chemical delivery systems. Published data for specific etch rates during high-dose crust removal is limited because wafer-level film thickness and implant species affect the ash residual.
Prior to gate dielectric deposition, SPM forms part of the pre-diffusion clean sequence when trace organic carbon must be reduced below typical XPS detection limits on bare silicon or on thermally grown silicon oxide. In this application, SPM is prepared at 4:1 and maintained at 120 °C for 10 min in immersion tools or 60–120 s in single-wafer tools. The oxidizer generates a chemical oxide layer; ellipsometric measurements on polished 100-oriented silicon wafers typically record thickness in the region of 0.8–1.2 nm after SPM and rinse. This chemical oxide is later removed in dilute HF prior to gate oxidation. The process removes organic residues from previous polishing and handling operations, but SPM by itself is insufficient for metallic contamination control. An SC2 step using HCl/H₂O₂/H₂O at 1:1:6 is subsequently used to remove trace metals from the surface. Metallic contamination after the complete pre-diffusion sequence is customarily verified by vapor phase decomposition–inductively coupled plasma mass spectrometry, with commonly reported contaminant levels below 1E10 atoms/cm² for Fe, Cu, Cr, and Zn on 300 mm monitor wafers. This application is performed in ISO 14644-1 Class 3 cleanroom environments with chemical delivery lines constructed from perfluoroalkoxy alkane to avoid cation leaching. Use of SPM immediately before high-k dielectric deposition is often restricted because the chemical oxide must be completely removed and the surface passivated under controlled gas-phase HF or in situ thermal treatment.
Wafer reclaim operations use SPM to remove photoresist, polyimide, and organic debris from test wafers carrying polysilicon or silicon nitride films. SPM does not strip polysilicon or nitride; these layers are addressed by HF/HNO₃ or H₃PO₄-based wet etching before or after SPM. In a recirculating quartz bath at 110–130 °C, bath life is limited by H₂O₂ decomposition and dilution from drag-out and reaction water. The acid concentration is maintained above 80 % of initial assay, and H₂O₂ concentration is monitored by redox titration or density measurement; when H₂O₂ falls below 0.5 mol/L at the nominal 3:1 start ratio, strip time increases and organic residues remain. Particle counts in the recirculation loop are controlled to below 50 particles/mL at a 0.2 µm size threshold by filtration, because reclaimed wafers must re-enter the line without adding particle defects. Batch-to-batch variance in organic film thickness on reclaim wafers changes oxidizer consumption; high-volume reclaim lines often adjust replenishment after every 50-wafer batch. The finished product is a cleaned test wafer with residual film layers intact for subsequent selective film removal; SPM in this sector is therefore a surface conditioning and organic removal step, not a film-removal step. Metal cross-contamination on re-used test wafers is controlled by dedicating reclaim SPM tools to specific film families, because wafers with exposed Cu or W must not enter the shared acid bath due to cation carryover. The same tool is not used for device wafer cleaning unless validated for metal contamination at ≤1E10 atoms/cm².
In MEMS sacrificial organic layer removal, SPM is applied to release polymer micromolds and residual photoresist from silicon, oxide, or nitride microstructures. A mixture ratio of 3:1 at 110–125 °C in quartz immersion tanks is common; time is set from 5 min to 20 min according to the crosslink density of the sacrificial polymer. The oxidizing bath attacks the organic material without dissolving silicon dioxide, but extended processing above 125 °C may slowly etch thermal oxide and alter anchor geometries in released structures. Release processes in production often use intermediate clamp rings or fixture holders to keep wafer stacks separated and to prevent stiction caused by capillary forces during rinse. After SPM release, wafers are rinsed with overflowing deionized water and dried with isopropanol vapor at low surface-tension conditions; critical dimension loss on lightly doped polysilicon microstructures is typically below 0.1 µm per SPM cycle when the bath is controlled. The finished product is a released MEMS test wafer that proceeds to wet or vapor HF etching when the sacrificial layer is silicon dioxide rather than organic. SPM in this sector is incompatible with metalized MEMS wafers containing exposed Al or Cu, which are oxidized and etched by the hot acidic peroxide mixture.
SPM in advanced packaging is confined to the period before PVD barrier and Cu seed deposition when only dielectric and passivation surfaces are exposed. The target is organic residue from plasma etch, lithography rework, and handling on silicon wafers, fan-out packages, or polymer dielectrics. A lower-temperature SPM formulation with H₂SO₄:H₂O₂ at 5:1 and a temperature window of 90–110 °C is preferred to reduce oxidizer attack on organic dielectrics and to preserve surface roughness. Single-wafer spray or immersion processes run for 60–180 s; endpoint is determined by contact angle or by integrated surface organic monitors. The process removes organic contamination before barrier PVD, but exposed Cu is excluded; SPM attacks copper and raises dissolved Cu concentration in the process bath, which can subsequently contact Cu-free wafers and create mobile metal contamination. Bath metal contamination is monitored by inductively coupled plasma mass spectrometry per EPA Method 6020A, and Cu is maintained below 0.1 ppb before Cu-free wafer processing. Surface roughness on polyimide or benzocyclobutene dielectric after SPM is typically specified at an Ra below 0.5 nm by atomic force microscopy over a 1×1 µm scan area; exceeding this boundary reduces seed adhesion and increases the risk of via bottom delamination. In packaging lines, SPM tools are physically separated from post-Cu cleaning tools to prevent cross-contamination; waste streams are segregated because Cu-bearing peroxide waste requires different neutralization. Batch-to-batch variation in the polymer dielectric surface state is monitored by water contact angle; after SPM plus IPA vapor dry, the contact angle is normally reduced to below 20° on oxide surfaces, indicating a clean hydrophilic condition. For organic surfaces, published data for the specific contact angle is limited and varies with polymer composition.
Photomask blank fabrication and rework employ SPM at lower temperatures to strip e-beam and laser resist films and to remove organic contamination from quartz or glass substrates before chromium deposition. The process uses a H₂SO₄:H₂O₂ ratio near 4:1 at 90–100 °C, often inside quartz tanks equipped with 1 MHz megasonic agitation; the lower temperature reduces quartz surface roughening and preserves the polished surface specification. In production, cleaned photomask blanks are inspected for light transmission and particle contamination; residual organic contamination is characterized by water contact angle and surface-sensitive methods, with typical particle counts controlled to fewer than 10 particles per 6-inch blank at a 0.5 µm threshold. SPM stripping is completed before chrome or molybdenum silicide hard mask films are deposited; after metal film deposition, SPM is not used because acidic peroxide partially oxidizes and chromatizes the metal surface. The finished product is a cleaned quartz blank ready for sputter deposition of the mask stack. The high-purity constraints in photomask cleaning are stricter than in wafer reclaim; SPM components are supplied with sub-ppb metal specifications and are filtered through 0.1 µm chemical filters at point of use. Equipment failure modes in this segment include megasonic transducer delamination and quartz tank etching at the meniscus when fresh SPM is added too rapidly.
| Application segment | H₂SO₄:H₂O₂ volume ratio | Process temperature | Typical time | Equipment | Primary target | Critical boundary condition |
|---|---|---|---|---|---|---|
| FEOL photoresist strip | 3:1–4:1 | 120–130 °C | 60–300 s | 300 mm single-wafer spray | DUV photoresist and organic post-etch residue | Inorganic residues require SC1/SC2 |
| High-dose implant crust | 4:1 | 130 °C | 10–20 min | Quartz immersion bath with N₂ purge | Carbonized resist after plasma ash | Incomplete ash causes flake redeposition |
| Pre-diffusion clean | 4:1 | 120 °C | 10 min immersion or 60–120 s spray | PFA-lined immersion/spray | Trace organic carbon before gate oxidation | Chemical oxide must be removed before high-k |
| Wafer reclaim | 3:1–5:1 | 110–130 °C | 15–30 min | Recirculating quartz bath | Photoresist, polyimide, debris on test wafers | Polysilicon/nitride not stripped by SPM |
| MEMS sacrificial release | 3:1 | 110–125 °C | 5–20 min | Quartz immersion tank | Organic sacrificial polymer and resist | Exposed Al/Cu incompatible |
| Advanced packaging pre-seed clean | 5:1 | 90–110 °C | 60–180 s | Single-wafer spray/immersion | Organic dielectric residue before PVD seed | Exposed Cu must not enter SPM |
| Photomask blank preparation | 4:1 | 90–100 °C | 5–15 min with megasonics | Quartz tank with 1 MHz transducer | E-beam/laser resist and organic particles on quartz | Metal mask films must not be present |
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Sulfuric acid–hydrogen peroxide mixture (SPM) Electronic/EL Grade is a formulated oxidizer system used where metallic and particulate contamination must be controlled below the detection limits of conventional acid cleaning. The product is not a single fixed chemical compound; it is a dynamically prepared mixture of high-purity 96 wt% sulfuric acid (H2SO4, CAS 7664-93-9) and 30 wt% hydrogen peroxide (H2O2, CAS 7722-84-1), combined most commonly at 4:1 v/v. Model designations are ratio-based rather than brand-specific: standard configurations include SPM 3:1/EL, SPM 4:1/EL, and SPM 7:1/EL, with the 4:1/EL blend specified most frequently for front-end wafer cleaning. A representative 4:1 v/v blend has a calculated density of 1.69 g/cm³ at 20 °C. The oxidizer is generated in situ by the reversible formation of peroxymonosulfuric acid (H2SO5, Caro’s acid) through H2SO4 + H2O2 ⇌ H2SO5 + H2O. Electronic/EL grade controls the blend to lower trace metal, anion, and particle burdens than technical-grade acid; critical transition metals are typically specified in the single-digit to low double-digit parts-per-billion range. Lot release is supported by certificates of analysis and, where applicable, by conformance to semiconductor-grade chemical standards such as SEMI C35. Packaging is cleanroom-rinsed and the product is either delivered as separate high-purity components for point-of-use blending or as ready-to-use SPM in high-density polyethylene or fluoropolymer containers.
Electronic/EL-grade SPM is commonly supplied in 20 L, 200 L, and 1000 L cleanroom containers, with dedicated returnable fluoropolymer totes for high-volume fabs. The product is manufactured by blending filtered 96 wt% H2SO4 and 30 wt% H2O2 under controlled temperature to limit premature Caro’s acid formation and oxygen gas evolution. Because SPM mixing is exothermic, point-of-use blending is preferred for large-volume wafer fabs; preblended product is used where on-site blending is not permitted due to exhaust capacity or chemical-room constraints. The analytical certificate for each lot reports blend ratio, trace metals by inductively coupled plasma mass spectrometry, particle counts by laser particle counter, and anion concentrations by ion chromatography. For advanced nodes, the user may require additional elements such as titanium, cobalt, and molybdenum at reporting limits below 1 ppb; this is normally addressed through custom analytical panels rather than by altering the standard specification.
Commodity technical-grade sulfuric acid can contain iron, aluminum, calcium, and other metals at parts-per-million levels; electronic/EL-grade SPM typically reduces each critical metal to less than 10 ppb after blending, a reduction of approximately three orders of magnitude. Technical-grade hydrogen peroxide may contain phosphate or stannate stabilizers that leave surface residues after drying; electronic-grade hydrogen peroxide is stabilized with low-metal chemistry and is filtered to remove particulates. Compared with SC-1 (NH4OH/H2O2/H2O) and SC-2 (HCl/H2O2/H2O) cleans, which are used at 60–80 °C for particle, organic, and ionic contamination control, SPM operates at 110–130 °C and is specifically designed for aggressive oxidative removal of photoresist, post-etch polymer, and carbonized organic residues. Ozonated sulfuric acid (SOM) has been introduced as a lower-peroxide alternative, but SPM remains specified where higher redox capacity per bath volume and simpler point-of-use blending are required. The product is not interchangeable with buffered oxide etch or dilute hydrofluoric acid; those chemistries remove silicon dioxide and metals but do not effectively oxidize cross-linked photoresist.
The difference is not limited to trace metal concentration. Electronic/EL-grade SPM is filtered and handled under high-purity conditions, while commodity acid may be stored in carbon steel or stainless steel that contributes chromium, nickel, and iron. In photolithography rework, SPM removes positive resist by oxidation, but it does not remove inorganic particles as effectively as SC-1; therefore, SPM is frequently followed by SC-1 to remove particles and residual organic oxidation products. The sequence is material: SPM is generally run before SC-1 because the acidic, high-temperature oxidizer removes the bulk organic load, while SC-1 in high-pH conditions then lifts particles and trace metals. Some dry-etch processes create metal-bearing residues; SPM alone may not remove aluminum fluoride or titanium nitride residues, so a subsequent wet metal etch or solvent clean may be required. Published data for specific residue matrices is limited and is generated on the process by coupon tests rather than from a single universal cleaning sequence.
On a production wet bench for 200 mm and 300 mm wafers, SPM Electronic/EL Grade is blended at point of use from 96 wt% H2SO4 and 30 wt% H2O2, heated to 110–130 °C in a quartz bath, and applied as an immersion or single-wafer spray. Batch immersion times for positive-tone novolak/diazonaphthoquinone photoresist stripping are typically 10–20 min, while high-dose ion-implant resists and post-plasma-ashed residues may require sequential SPM clean followed by SC-1 and dilute hydrofluoric acid. In single-wafer spray processors, SPM is dispensed at 80–120 °C for 60–120 s with direct deionized water rinse to prevent crystal formation. The cleaning mechanism is carbon bond oxidation by Caro’s acid; residual sulfates are removed by hot deionized water rinse, and metal residues are subsequently chelated or undercut by SC-1 or dilute hydrofluoric acid. The bath is recirculated through 0.1 µm or 0.2 µm PFA/PTFE filters at 0.5–2.0 bath volumes per minute; wetted components are quartz, PTFE, PFA, and PVDF. Because hydrogen peroxide concentration declines with temperature and organic loading, closed-loop spiking of 30 wt% H2O2 is controlled by specific gravity, refractive index, or oxidation-reduction potential. Process bath life is set by particle counts, trace metal accumulation, and sulfate residue level, not solely by elapsed time.
For implanted photoresist with dose greater than 5 × 1014 ions/cm², the outer resist shell is carbonized and densified; SPM oxidation begins at the outer carbonized layer and undercuts the underlying bulk resist. The reaction rate depends on temperature, peroxide concentration, and resist cross-link density. At 120 °C, stripping of a standard 2 µm positive resist is often completed within 10–15 min, but high-dose implant resist may require 20–30 min or a two-step process with an initial ashing step. Endpoint detection is typically visual or based on optical absorbance/residue inspection; in-line inspection after rinse confirms complete removal. The mixture is aggressive toward organic materials but not toward thermal silicon dioxide or silicon nitride at typical process times, although repeated exposure can roughen the oxide surface and increase surface defect density if post-SPM rinsing is inadequate.
At 110–130 °C, the equilibrium concentration of Caro’s acid is kinetically short-lived; hydrogen peroxide decomposes to water and oxygen, so the oxidation potential drifts unless peroxide is replenished. In open quartz tanks, the headspace above the liquid must be exhausted through acid-resistant scrubbers to remove sulfuric acid mist and oxygen released by peroxide decomposition. Bath heating is executed with quartz immersion heaters or PTFE/PFA heat exchangers; metallic heating elements are not acceptable. Process control is based on mass balance and periodic titration: a 4:1 v/v blend may show density near 1.69 g/cm³ at 20 °C, but density at operating temperature is lower and is corrected for thermal expansion. When photoresist loading is high, oxygen evolution can generate foam above the liquid surface; bath level sensors and overflow weirs are designed to prevent foam carryover into adjacent rinse tanks. The upper operating limit is generally 130 °C; above this temperature, aerosol formation and peroxide decomposition increase without a proportionate rise in stripping rate. Below 90 °C, the oxidative reaction rate for organic residues decreases and cleaning time becomes excessive for production throughput. Particulate contamination is controlled by continuous recirculation through 0.1 µm membranes; dissolved metal contamination cannot be corrected by filtration, so incoming raw-material purity remains the limiting factor for metal-sensitive process steps.
Point-of-use blending systems use flow meters and mass flow controllers qualified for 96 wt% H2SO4 and 30 wt% H2O2; blend ratio errors above 5% can shift the Caro’s acid equilibrium and alter stripping rate. Because the density difference between the two precursor streams is large, static mixing is used prior to heater inlet. Recirculation pumps are typically PTFE- or PFA-lined magnetic-drive units; metal-canned pumps are avoided because acid permeation into the rotor cavity can cause corrosion and particle generation. Filter cartridge life is tracked by differential pressure; pressure drop above 0.15 MPa may indicate filter blinding by stripped resist debris. Dissolved metal contamination is monitored by collecting bath samples after a fixed etch-load turnover and analyzing by ICP-MS; excursions require bath dump, rinse, and passivation of wetted surfaces with high-purity acid. These process controls are derived from standard wet-bench practice and equipment specifications published by chemical delivery system vendors.
Procurement and incoming inspection for SPM Electronic/EL Grade typically reference the following release parameters. Limits vary among device manufacturers and process nodes; tighter control may be required for gate oxide and silicide processes.
| Parameter | Typical limit or value | Reference method |
|---|---|---|
| H2SO4 assay | 96.0 ± 0.5 wt% | Acidimetric titration; vendor CoA |
| H2O2 assay | 30.0–31.0 wt% | Potassium permanganate titration; vendor CoA |
| Blend ratio (H2SO4:H2O2) | 4:1 v/v ± 5% | Density or refractive index |
| Trace metal per element (Fe, Al, Ca, Cu, Ni, Cr, Zn) | < 10 ppb each | ICP-MS after matrix dilution |
| Total trace metals | < 50 ppb | ICP-MS |
| Particles ≥ 0.2 µm | < 100 counts/mL | Laser particle counting; SEMI C35 |
| Chloride (Cl) | < 200 ppb | Ion chromatography |
| Nitrate (NO3) | < 200 ppb | Ion chromatography |
| Packaging | Cleanroom-rinsed fluoropolymer or high-purity glass | Certificate of conformance |
Method suitability is important: ICP-MS is preferred for trace metals because it achieves reporting limits below 1 ppb after matrix dilution, while colorimetric methods are insufficient for electronic-grade SPM. Particle counting must be performed on freshly degassed samples to avoid false counts from oxygen bubbles. Chloride and nitrate are measured by ion chromatography with matrix separation; high sulfate background can interfere, so the analytical laboratory uses standard additions or matrix-matched calibration. Certificate of analysis data should be retained for lot traceability through impurity audits.
| Reference | Scope | Relevant material or system |
|---|---|---|
| SEMI C35 | Sulfuric acid/hydrogen peroxide mixture specifications | Finished SPM grade, trace metal and particle control |
| SEMI C30 | Electronic-grade hydrogen peroxide | 30 wt% H2O2 raw material |
| SEMI C44 | Electronic-grade sulfuric acid | 96 wt% H2SO4 raw material |
| REACH (EC) No 1907/2006 | EU chemical registration and safe use | Substance and mixture communication |
| OSHA 29 CFR 1910.1200 | Hazard communication | SDS and container labeling |
| ANSI Z358.1 | Emergency eyewash and shower equipment | Handling and emergency response |
Storage conditions differ for the two precursor streams. Electronic-grade 30 wt% hydrogen peroxide is stored in dedicated, vented, high-density polyethylene or fluoropolymer tanks at controlled temperature below 35 °C, away from transition-metal catalysts and organic contamination. Electronic-grade 96 wt% sulfuric acid is stored in sealed low-carbon steel or fluoropolymer-lined tanks, with inert gas blanketing where moisture sensitivity is a concern. Ready-to-use SPM product, if shipped, must be degassed and maintained in vented containers to avoid pressure accumulation. The mixture is incompatible with organic solvents, reducing agents, bases, ammonia-containing chemistries, and concentrated hydrochloric acid; drains and waste lines must be dedicated and continuously flushed with water to prevent exothermic reaction accumulation. Personnel handling requires full acid protective equipment, chemical goggles, face shield, and access to ANSI Z358.1-compliant eyewash and safety shower stations. Spill response uses inert absorbents that are free of organics and reducing materials; cleanup personnel must not use sawdust, rags, or solvent-based neutralizers.
