Summary. Per the SDS, store formic acid 85% in a cool, well-ventilated place below 30 C, in tightly closed HDPE, stainless steel or glass containers. Avoid carbon steel and copper alloys, and keep it away from oxidisers, alkalis and reactive metals. The SDS lists a melting point of 8.4 C and notes the product may solidify below it. Wear goggles with a face shield, resistant gloves and, where vapour is present, acid-gas/organic-vapour respiratory protection.
Why formic acid needs more care than a typical process acid
Under the safety data sheet (SDS Rev 3.1, section 2) formic acid 85% carries the signal word Danger and several classes at once: Flammable Liquid Category 3, Corrosive to Metals Category 1, Skin Corrosion Category 1, Serious Eye Damage Category 1, acute toxicity by inhalation Category 3 and acute oral toxicity Category 4, with STOT RE 2 for repeated exposure. The hazard statements are H226, H290, H302, H314, H318, H331, H332 and H373. Put plainly, the SDS says it burns skin and eyes, its vapour is toxic to breathe, it attacks some metals, and it is classed as a flammable liquid.
Supreme Petro Chemicals is a Chennai importer and bulk distributor of formic acid, not a manufacturer. This guide separates two kinds of statement. Points taken from the SDS are stated plainly with the section cited. Anything else is marked General practice (not from the SDS) or General knowledge, and your own site safety assessment, the maker's SDS and local rules always take precedence.
Choosing a container
SDS section 7 lists HDPE, stainless steel or glass as compatible containers and says to avoid carbon steel and copper alloys. We quote formic acid in 35 kg HDPE drums and IBC tanks.
| Material | Guidance |
|---|---|
| HDPE | Listed as a compatible container |
| Stainless steel | Listed as a compatible container |
| Glass | Listed as a compatible container |
| Carbon steel | Avoid |
| Copper and copper alloys | Avoid |
| Aluminium, zinc, magnesium | Listed as incompatible reactive metals |
General practice (not from the SDS): check pumps, hoses, valves and gaskets as well as the tank, because a compatible tank fitted with an incompatible valve defeats the purpose. Ask your fittings supplier to confirm compatibility with 85% formic acid rather than assuming it.
Where and how to store it
- Temperature and place: SDS section 7 gives below 30 C and a cool, dry, well-ventilated area away from direct sunlight and heat sources. Shelf life is 12 months from manufacture.
- Segregation: SDS sections 7 and 10 list strong oxidising agents, strong bases, reactive metals (aluminium, zinc, magnesium), halogens and concentrated mineral acids as incompatible. Do not store next to food, drink or animal feed.
- Ignition sources: the SDS classifies the product as a flammable liquid (Category 3, H226) and says to keep it away from ignition sources. It also quotes a flash point of 69 C as a literature value to verify. A flash point of 69 C does not sit within the usual Category 3 range (general knowledge: 23 C to 60 C), so the classification and the quoted figure are not consistent with each other. Confirm both against the maker's current SDS.
- Labelling: keep the original label. The transport entry is UN 1779, Class 8, Packing Group II, with a subsidiary Class 3 risk for concentrations of 85% and above (SDS section 14).
General practice (not from the SDS): many sites store corrosive liquids on a bunded, acid-resistant floor so that a leak is contained. Follow your own site standard.
Freezing: what the 8.4 C figure means
The SDS notes the product may solidify below its melting point (8.4 C), so plan storage temperature with that in mind. General knowledge: 8.4 C is the melting point of pure formic acid, and a water-diluted acid usually freezes at a different temperature, so confirm the behaviour of the 85% grade with the maker's SDS. Treat 8.4 C as a cautious planning figure when you choose where to keep containers in cooler months.
If a drum has solidified or partly solidified, do not improvise. Follow the maker's SDS and your own site procedure, and involve your safety officer. We do not give thawing or mixing instructions here, because formic acid 85% is corrosive, toxic by inhalation and classed as a flammable liquid, and the SDS does not describe a thawing method.
Personal protective equipment
| Area | Recommendation |
|---|---|
| Hands | Butyl, neoprene or PVC gloves |
| Eyes and face | Chemical goggles plus a face shield |
| Respiratory | Acid-gas/organic-vapour respirator cartridges |
| Eye contact | Rinse for 15 minutes and obtain medical attention |
| Exposure limits | OSHA PEL 5 ppm TWA; ACGIH TLV 5 ppm TWA, STEL 10 ppm; NIOSH REL 5 ppm |
For local exposure limits the SDS says to consult the latest MoLE / State Factories Inspector exposure-limit schedule. SDS section 8 also says to provide eyewash stations and safety showers in the working area. Refer to the full SDS for skin, inhalation and ingestion first aid.
Spills and waste
SDS section 6 says to contain a spill by bunding or by absorbing it with an inert, non-combustible absorbent such as sand, earth or vermiculite, not to use combustible absorbents, and to collect the material into clearly labelled, compatible, closed containers for disposal through an approved waste contractor. SDS section 15 names the Manufacture, Storage and Import of Hazardous Chemicals (MSIHC) Rules 1989 (as amended), the Hazardous and Other Wastes (Management and Transboundary Movement) Rules 2016 and the Environment (Protection) Act 1986 as relevant Indian regulation.
General practice (not from the SDS): keep people without PPE away from the area, ventilate it, and do not wash product to a drain. Site emergency procedures and your waste contractor's instructions govern the actual response.
Receiving a delivery
The following receiving checks are general practice (not from the SDS), offered as a starting point for your own goods-in procedure.
- Check that each container is sealed, undamaged and carries the product name and the UN 1779 Class 8 label.
- Match the batch Certificate of Analysis, supplied with every delivery, to the batch marked on the containers, and record the batch number for traceability.
- Compare the reported results with the TDS rows on the formic acid 85% specification table.
- Keep the SDS to hand where the acid is unloaded, and confirm that the receiving area has an eyewash and safety shower.
- Record the receipt date, so that the 12-month shelf life from manufacture can be tracked for your own batch rotation.
What this guide deliberately leaves out
Some questions buyers often ask are not answered by the SDS, and we would rather say so than guess. The SDS does not give a method for thawing a solidified drum, a mixing procedure after freezing, or a recommended spill neutralising agent. For any of these, rely on the maker's SDS, your site procedure and your safety officer. The hazard classification, freezing and storage points are summarised in the formic acid safety and storage table, which cites the SDS section for each row.
Handling checklist
- HDPE, stainless steel or glass containers; no carbon steel or copper alloys.
- Store below 30 C, ventilated, away from oxidisers, alkalis, reactive metals and food or feed.
- Plan for freezing: the SDS notes the product may solidify below 8.4 C.
- Goggles, face shield, resistant gloves; eyewash and shower in the working area.
- Inert, non-combustible absorbent for spills; no combustible absorbents.
- Keep the batch CoA and SDS on file.
Related reading
Formic acid is one of several industrial acids we supply from Chennai. If your process could use a milder acid, compare it with acetic acid; we also supply oxalic acid. To request formic acid, send strength, quantity, pack type and delivery location; we quote within 4 working hours.