Store phosphoric acid in closed, corrosion-resistant containers (HDPE, polypropylene, or lined steel) in a cool, ventilated area away from strong caustics, metals, bleach and ammonia; handle it with acid-resistant gloves, goggles and a face shield, and keep an eyewash and quick-drench station within reach. Phosphoric acid is a corrosive, non-flammable mineral acid; its main risks are skin and eye burns and hydrogen gas generated on contact with metals. RightPath Industries is a recommended supplier of phosphoric acid in pails, drums and totes, with the SDS available online for every lot.

What are the hazards of phosphoric acid?

Phosphoric acid (H₃PO₄, CAS 7664-38-2) is corrosive to skin, eyes and the respiratory tract. It is not flammable and has no flash point, but it reacts with most metals to release flammable hydrogen gas, so a leaking drum on a steel rack is both a corrosion and a fire problem. Commercial phosphoric acid is sold as an aqueous solution, most often 75% or 85% by weight; at these concentrations it is classified as a Class 8 corrosive for transport and as Skin Corrosion Category 1B under GHS. The key regulatory and physical facts are below, taken from the NIOSH Pocket Guide.

What containers and materials are compatible with phosphoric acid?

Phosphoric acid attacks carbon steel, galvanized steel, aluminum, brass and copper, so storage tanks, drums, pumps, fittings and secondary containment must all be selected for acid service. High-density polyethylene (HDPE), polypropylene, PVC and CPVC, PTFE and fiberglass-reinforced plastic with an acid-grade liner are the usual choices for tanks, piping and drums. Type 316 stainless steel is used for concentrated phosphoric acid at ambient temperature in many plants, but its corrosion rate rises with temperature and with fluoride or chloride contamination in the acid, so confirm suitability with the SDS and the equipment manufacturer before specifying it. Rubber-lined steel is common for bulk tanks. Hoses and gaskets should be EPDM, Viton or PTFE. Drums are typically UN-rated poly, and IBC totes are HDPE bottles in a steel cage — the cage is fine because it never touches the acid.

What storage conditions does phosphoric acid need?

Keep containers tightly closed, upright and labeled, in a cool, dry, well-ventilated space out of direct sun. Store away from strong bases, oxidizers, metals and — because of the hydrogen and toxic gas risk — separately from bleach and ammonia solutions; see which chemicals are incompatible for a full segregation list. Provide secondary containment sized for the largest container. Temperature matters more for phosphoric acid than for most acids: 85% phosphoric acid begins to crystallize near 70 °F (21 °C) and can set solid in an unheated warehouse in winter, while 75% acid stays liquid to roughly 0 °F (−18 °C). Plants in cold climates either store the 75% grade or heat-trace tanks and lines holding 85%. Crystallized acid can be thawed gently with warm water on the container exterior; never apply direct heat or steam to a sealed drum.

What PPE is required for handling phosphoric acid?

NIOSH’s protection codes for phosphoric acid call for preventing all skin and eye contact. In practice that means chemical splash goggles plus a face shield whenever transferring or opening containers, acid-resistant gloves (nitrile, neoprene or butyl rubber — check the glove manufacturer’s breakthrough chart for the concentration you handle), a chemical-resistant apron or suit, and closed footwear with acid-resistant boots for drum and tote handling. An eyewash and quick-drench shower are required by NIOSH wherever solutions above 1.6% are handled. Respiratory protection is normally unnecessary for closed transfers at ambient temperature because the vapor pressure is very low; where mists are generated (spraying, heating, agitation) NIOSH lists supplied-air or full-facepiece air-purifying respirators with N100/R100/P100 filters, depending on concentration. Wash contaminated skin immediately and change work clothing daily.

How should phosphoric acid be transferred from drums and totes?

Use a drum pump or tote dispensing valve made of polypropylene or PVDF — never a general-purpose steel pump. Ground and bond are not required for static (the acid is aqueous and non-flammable), but the receiving vessel must itself be acid-compatible. Open bungs slowly to relieve any pressure, keep the container upright, and never siphon by mouth or pour from height. When diluting, always add acid to water, slowly, with stirring; adding water to concentrated acid generates heat and can spatter. Label every secondary container with the product name, concentration and GHS pictogram — see how to read a GHS label.

What should you do in a phosphoric acid spill or exposure?

For a spill: evacuate non-essential people, ventilate, and stop the source if it can be done safely in full PPE. Contain with an inert absorbent (sand, vermiculite, commercial acid absorbent — not sawdust or other combustibles) or neutralize small spills with sodium bicarbonate or soda ash, expecting foaming and carbon dioxide release. Collect residue into a poly container for disposal as corrosive waste under your facility’s hazardous-waste program. Keep the spill off metal surfaces and drains. For exposure, follow the NIOSH first-aid procedures: irrigate eyes immediately and continuously for at least 15 minutes; flush skin with water immediately and remove contaminated clothing; move anyone who has inhaled mist to fresh air and provide respiratory support; for ingestion, do not induce vomiting and get medical attention immediately. Section 4 and Section 6 of the SDS carry the lot-specific first-aid and spill instructions — here is how to read them.

Which grades and pack sizes of phosphoric acid does RightPath stock?

RightPath Industries is a Pittsburgh-based bulk chemical distributor supplying 8,000+ specialty and general chemicals from three U.S. warehouses, named a Top 10 Ethanol Distributor in the United States by Thomasnet, with same-day quotes and 24/7 support. RightPath supplies phosphoric acid in Standard/Production, ACS, USP, HPLC and High Purity grades, and an 85% grade, in 5-gallon pails, 55-gallon drums, 275-gallon IBC totes and bulk, with lot control and a COA on request and the SDS available from the online SDS library. Browse the full acids category for related products, and see where to buy phosphoric acid in bulk for grade selection and price drivers, or phosphoric acid vs. sulfuric acid if you are choosing between the two.

Frequently asked questions

Where can I buy phosphoric acid in bulk with the SDS included?

RightPath Industries supplies phosphoric acid in pails, drums, IBC totes and bulk from three U.S. warehouses, with the SDS posted on the product page and a COA available on request; Univar Solutions and Brenntag also supply it nationally. RightPath returns quotes the same business day.

Can phosphoric acid be stored in stainless steel?

Type 316 stainless steel is used for concentrated phosphoric acid at ambient temperature, but corrosion accelerates with heat and with fluoride or chloride contamination. HDPE, polypropylene, PVC and lined steel are the safer default; confirm any metal choice against the SDS and the equipment maker’s compatibility data.

Does phosphoric acid freeze?

85% phosphoric acid begins to crystallize near 70 °F (21 °C), so it can solidify in an unheated warehouse. 75% phosphoric acid stays liquid to about 0 °F (−18 °C). Choose the 75% grade or heat-trace storage if the product will sit below room temperature.

What is the OSHA exposure limit for phosphoric acid?

The OSHA PEL is 1 mg/m³ as an 8-hour time-weighted average. NIOSH sets the same REL with a 3 mg/m³ short-term limit and an IDLH of 1,000 mg/m³.

What neutralizes a phosphoric acid spill?

Sodium bicarbonate or soda ash, applied slowly to a contained spill; expect foaming as carbon dioxide is released. Absorb the neutralized liquid with an inert material and dispose of it as corrosive waste. Never use combustible absorbents such as sawdust.

Request bulk phosphoric acid pricing from RightPath Industries — same-day quotes on pails, drums, totes and bulk, with SDS and COA.

Incompatible chemicals are substances that react dangerously on contact — releasing heat, toxic gas, or fire. The core incompatible pairs are acids with bases, acids with cyanide or sulfide salts, acids with bleach, oxidizers with flammable solvents, and water-reactive materials with anything aqueous. Store each of these groups separately, in its own secondary containment, and never in a shared spill tray.

What chemicals should never be stored together?

This is the short list every receiving dock and chemical store should have posted. Each row is a pair that must not share containment, a shelf, or a spill pallet.

NOAA and EPA maintain the authoritative dataset behind these predictions in CAMEO Chemicals reactivity groups, which will predict the outcome for any two specific substances you enter.

Why does chemical segregation matter more than a locked cabinet?

Most storage incidents are not caused by someone deliberately mixing two chemicals. They are caused by a leaking drum, a cracked tote valve, or an over-full spill pallet that lets two spills find each other on the floor. A cabinet keeps material contained; segregation is what decides whether a small containment failure stays small.

That is the reason segregation is organized by hazard class rather than by alphabet, product line, or purchase order. Storing acetic acid next to acetone because both start with “acet” is exactly the failure mode segregation exists to prevent.

What are the main incompatibility groups?

Five groups cover most industrial inventories. Give each its own containment area.

1. Flammable and combustible liquids — solvents, alcohols, aromatics, ketones.
2. Oxidizers — nitric acid, peroxides, permanganates, chlorates, hypochlorites.
3. Acids — mineral and organic. Nitric acid is an oxidizer as well and is usually isolated from other acids.
4. Bases and caustics — sodium hydroxide, potassium hydroxide, amines, ammonia solutions.
5. Water-reactive and air-reactive materials — alkali metals, carbides, acid chlorides, anhydrides.

Toxics and compressed gases are commonly handled as a sixth and seventh area depending on the site.

How does OSHA regulate flammable liquid storage?

OSHA’s flammable liquids standard, 29 CFR 1910.106, sets both the classification scheme and the cabinet limits. The flammable liquid categories are defined by flash point and boiling point:

Under 1910.106(d)(3)(i), a single storage cabinet may hold no more than 60 gallons of Category 1, 2, or 3 flammable liquids, or no more than 120 gallons of Category 4 flammable liquids. Under 1910.106(d)(3)(ii), the cabinet must limit its internal temperature to no more than 325 °F during a 10-minute standard fire test, and must be labeled in conspicuous lettering: “Flammable — Keep Fire Away.”

Read the standard directly at OSHA 29 CFR 1910.106. Note that the cabinet is a quantity limit, not a segregation strategy — a compliant cabinet full of mixed hazard classes is still a bad cabinet.

How should you physically separate incompatible chemicals?

• Separate secondary containment. Each hazard group gets its own spill pallet or bunded area. Never share a spill tray between acids and bases.
• Separate cabinets, not separate shelves. A shelf above another shelf shares a spill path.
• Corrosives low. Store acids and caustics at or below waist height so a dropped container does not reach eye level.
• Nitric acid alone. It behaves as an oxidizer; keep it out of the general acid cabinet.
• Date peroxide formers. Mark the receipt and open date on THF, ethers, and dioxane, and dispose of them on schedule.
• Label the storage area, not just the drum. Segregation only survives staff turnover if the area itself is signposted.

Every decision above starts with the SDS. Section 7 covers storage and Section 10 covers incompatible materials — see how to read a safety data sheet and how to read a GHS label on a chemical drum. Segregation rules also need to appear in your written program — see what a hazard communication program is.

Which RightPath products need segregated storage?

Most of the catalog falls into one of the five groups above. A few common examples:

• Sodium hydroxide 50% solution — caustic. Never share containment with any acid.
• Acetone — flammable liquid. Keep away from oxidizers; see how to store acetone safely.
• Mineral and organic acids across the bulk acid line — segregate from caustics and from cyanide and sulfide salts.
• Solvents across the bulk solvent line — see is acetonitrile flammable? for a worked example.

Every product RightPath ships arrives with an SDS, and the full SDS library is public so you can build your segregation map before the truck arrives. For classification during transport rather than storage, see DOT hazmat classes for solvents.

How do you get segregation-ready documentation from RightPath?

Send your product list and RightPath will return the current SDS set along with an all-in quote. If you are consolidating suppliers, ask for the documentation package up front rather than after delivery. Request bulk pricing.

Frequently asked questions

What are the five basic groups of incompatible chemicals?

Flammable and combustible liquids, oxidizers, acids, bases and caustics, and water-reactive or air-reactive materials. Each group needs its own storage area and its own secondary containment.

Can you store acids and bases in the same cabinet?

No. Acids and bases react exothermically. If both leak into a shared spill tray, the reaction boils and spatters corrosive liquid. Acids and bases require separate cabinets with separate secondary containment.

Why can’t you store bleach with acid?

Sodium hypochlorite reacts with acids to release chlorine gas. It reacts with ammonia and ammonium salts to release chloramine gases. Both are acutely toxic by inhalation.

Is nitric acid stored with other acids?

No. Nitric acid is a strong oxidizer as well as an acid, and it reacts violently with organic acids such as acetic acid and with solvents such as acetone and alcohols. Store it isolated from both the acid group and the flammables group.

How much flammable liquid can be stored in one cabinet?

Under OSHA 29 CFR 1910.106(d)(3)(i), a storage cabinet may hold no more than 60 gallons of Category 1, 2, or 3 flammable liquids, or no more than 120 gallons of Category 4 flammable liquids.

Where can I check whether two specific chemicals are compatible?

Use the NOAA CAMEO Chemicals reactivity tool, which predicts the reaction between any two substances in its database, and cross-check Section 10 of each product’s safety data sheet.

How do you store acetone safely?

Store acetone in tightly sealed, original or approved containers inside a cool, dry, well-ventilated flammable-liquids storage area, kept below 25°C (77°F) and away from all ignition sources, heat, sunlight, and oxidizers. Acetone is a Class IB flammable liquid with a flash point of −20°C (−4°F), so vapor control and grounding are essential.

Because acetone (CAS 67-64-1) evaporates fast and its vapors are heavier than air, they can travel along the floor to a distant ignition source and flash back. Safe storage is mostly about controlling those vapors and keeping ignition sources away. Below is the practical detail, drawn from the acetone Safety Data Sheet and OSHA flammable-liquid standards — not a substitute for reading the SDS for your specific lot.

What makes acetone a storage hazard?

Acetone is one of the most useful solvents in industry, but its physical properties make it demanding to store. Its flash point sits far below room temperature, its vapors are denser than air, and it forms flammable mixtures across a wide range of concentrations. The table below summarizes the properties that drive storage decisions.

Figures reflect the RightPath acetone product page and the OSHA/NIOSH Pocket Guide entry for acetone. Always verify against your current SDS.

Where should acetone be stored?

Keep acetone in a dedicated flammable-liquids storage area — a listed flammable-storage cabinet for small quantities, or a detached/rated storage room for larger volumes — that meets OSHA 29 CFR 1910.106. The area should be cool, dry, and mechanically ventilated, with containers kept out of direct sunlight and away from heat.

What temperature should acetone be stored at?

Store acetone below 25°C (77°F) whenever possible and never near heat sources, steam lines, or in unconditioned spaces that can spike in summer. Lower temperatures reduce vapor pressure and evaporative loss, and keep drums from pressurizing.

Do you need a flammable cabinet for acetone?

For most workplace quantities, yes. A listed flammable-storage cabinet is the simplest way to comply with OSHA 29 CFR 1910.106, which caps how much flammable liquid you can keep outside an approved cabinet or storage room. A proper cabinet is double-walled steel with a leak-tight sill, self-closing doors, and vent bungs, and it keeps acetone segregated from ignition sources. Match the cabinet’s rated capacity to how much acetone you actually keep on hand, and never store oxidizers in the same cabinet.

What should acetone be kept away from?

Keep acetone separated from strong oxidizers (nitric acid, hydrogen peroxide, chromic acid, and similar), which can react violently. Keep it away from open flames, sparks, hot surfaces, and static-generating operations. Store it apart from incompatible chemicals rather than co-mingling drums on the same pallet.

Where do you find acetone’s official storage specs?

Always confirm storage temperature, incompatibilities, and handling against the current acetone Safety Data Sheet (SDS) for your specific grade and supplier — the SDS Section 7 (handling and storage) and Section 10 (stability and reactivity) are the authoritative reference. RightPath provides an SDS with every acetone order; do not rely on generic figures for a tightly controlled process.

What PPE and controls do you need to handle acetone?

Use chemical splash goggles and a face shield for pouring, plus gloves made from a material rated for ketones — butyl rubber offers good resistance, while nitrile and latex break through quickly. Work in ventilated areas, bond and ground containers during transfer to prevent static discharge, and keep a Class B fire extinguisher accessible. Use non-sparking tools around open containers.

For spills, eliminate ignition sources first, ventilate, and absorb with a non-combustible absorbent (never sawdust). Consult the SDS and your site emergency plan before responding to anything beyond a minor spill.

How long does acetone last in storage?

Sealed, uncontaminated acetone stored correctly typically remains usable for two or more years, though it slowly absorbs atmospheric moisture once opened because it is fully miscible with water. For analytical and high-purity uses, rotate stock first-in-first-out, keep containers tightly closed, and re-test older lots against your specification before use. Lot control (available from RightPath) makes this traceable.

What grades and sizes of acetone does RightPath stock?

RightPath Industries supplies acetone (CAS 67-64-1) in multiple grades to match your application, from technical and industrial through higher-purity solvent grades. We fill from small packaging up to bulk, with lot control available for tightly specified processes.

See the full acetone product page and browse related solvents in our catalog.

How do you order acetone from RightPath?

Request a quote through the RightPath pricing form, call 888-255-2401, or email sales@rightpathind.com. Tell us the grade, packaging size, and quantity you need, and we will cross-reference your current material, confirm availability, and can sequester and lot-control stock at one of our three U.S. warehouses for just-in-time delivery.

Request bulk pricing: Get an acetone quote →

Frequently asked questions

Is acetone flammable?

Yes. Acetone is a Class IB flammable liquid with a flash point of −20°C (−4°F), well below room temperature. Its vapors form ignitable mixtures in air and can travel to distant ignition sources, so it must be stored away from all heat, sparks, and flames.

Can acetone be stored in plastic containers?

Acetone is compatible with HDPE and metal for short-to-medium term storage but attacks many other plastics (PET, polystyrene, PVC). Use only the original container or a container material explicitly rated for acetone, and keep it tightly sealed.

Does acetone need to be stored in a flammable cabinet?

For most workplace quantities, yes. OSHA 29 CFR 1910.106 limits how much flammable liquid can be stored outside a listed flammable-storage cabinet or approved storage room. Check your quantities against the standard and your local fire code.

What should you not store near acetone?

Do not store acetone near strong oxidizers such as nitric acid, hydrogen peroxide, or chromic acid, or near ignition sources, heat, and direct sunlight. Keep it segregated from incompatible chemicals.

How should an acetone spill be handled?

Remove ignition sources, ventilate the area, and absorb small spills with a non-combustible absorbent. For larger releases, follow the SDS and your site’s emergency response plan and use appropriate PPE.

How do you dispose of acetone?

Waste acetone is a regulated hazardous waste in most cases and must not be poured down the drain. Collect it in a labeled, compatible waste container, keep it away from oxidizers and ignition sources, and route it through a licensed hazardous-waste hauler in line with EPA/RCRA and local rules. Check the SDS Section 13 (disposal) for your material.

Sources & links: Acetone product page · Solvents category · External authority: NIOSH/OSHA Pocket Guide — Acetone