⚠️ Safety & Handling Guide
Butyric Acid Safety, Handling and Storage: A GHS Guide
Corrosive, pungent and classified as Danger. Here is how to work with butyric acid (CAS 107-92-6) safely - from PPE to spill response to compliant storage.
Butyric acid (butanoic acid, CAS 107-92-6) earns its place across feed, flavors, coatings and pharma - but it demands respect on the plant floor. It is corrosive to skin, eyes and many metals, and its penetrating rancid-butter odor means that even a minor release announces itself immediately. ⚠️ This guide gives handlers a practical, standards-aligned overview of the hazards and the controls that keep people safe and operations compliant.
This is general guidance, not a substitute for the product-specific Safety Data Sheet. Always read the current SDS on the N-Butyric Acid product page and follow your local regulations. For the full picture of where this acid is used, see our pillar guide, Butyric Acid Uses and Applications.
🚨 GHS Classification at a Glance
| Signal word | Danger |
| Key hazard statement | H314 - Causes severe skin burns and eye damage |
| Also commonly cited | H302 (harmful if swallowed); other statements may apply by supplier classification |
| Precautionary (examples) | P280 (wear protection) · P305+P351+P338 (eye rinse) · P310 (call poison center/doctor) |
| Transport | UN 2820, Class 8 (corrosive), Packing Group III |
| Physical hazard note | Combustible liquid - flash point ~71–72 °C |
Classification can vary slightly between suppliers and jurisdictions. Verify against your SDS and authoritative sources such as ECHA and PubChem (CID 264).
🔍 Understanding the Hazards
Three hazard categories matter most day to day:
Curious why the odor is so overpowering even in trace amounts? The chemistry is covered in Why Does Butyric Acid Smell So Bad?
🧤 PPE & Engineering Controls
Because the dominant hazard is corrosivity, protection focuses on keeping the liquid and its vapor away from skin, eyes and airways: ✅
✅ Eye protection - chemical splash goggles; a face shield for pouring or transfer operations.
✅ Gloves - chemical-resistant gloves compatible with carboxylic acids; inspect and replace as needed.
✅ Body protection - acid-resistant apron or suit and closed footwear.
✅ Respiratory protection - where ventilation is inadequate, use an appropriate organic-vapor respirator (e.g., ABEK-type filter).
✅ Ventilation - work under local exhaust or in a fume hood; keep vapor concentrations low.
✅ Facilities - an eyewash station and safety shower must be immediately accessible in the work area.
For occupational exposure guidance and control principles, consult OSHA and NIOSH.
✋ Safe Handling Practices
🔹 Handle in well-ventilated areas, away from ignition sources.
🔹 Avoid all contact with skin and eyes; never rely on smell as an "all clear."
🔹 Use corrosion-resistant equipment; the acid attacks many common metals.
🔹 Keep containers tightly closed to limit vapor release and odor spread.
🔹 Do not eat, drink or smoke while handling; wash thoroughly afterward.
🔹 Keep incompatible materials (strong oxidizers, strong bases) separated.
🧯 Spill Response & First Aid (Overview)
Spill: Evacuate and ventilate the area; wear full PPE. Contain the spill and absorb with an inert material (sand, vermiculite). Neutralize cautiously per your SDS, then collect into a labeled, compatible container for disposal. Keep out of drains and watercourses. 🧪
Skin contact: Remove contaminated clothing; rinse skin with plenty of water; seek medical attention for burns.
Eye contact: Rinse cautiously with water for several minutes (remove contact lenses if present and easy to do); continue rinsing and get medical attention promptly (P305+P351+P338, P310).
Inhalation / ingestion: Move to fresh air; do not induce vomiting; get medical advice. Always follow the detailed first-aid section of the current SDS.
📦 Storage & Compatibility
🔹 Store in a cool, dry, well-ventilated area, away from direct sunlight and heat.
🔹 Keep containers tightly closed and upright; use corrosion-resistant materials and secondary containment.
🔹 Segregate from strong oxidizers and strong bases (incompatibles).
🔹 Store away from foodstuffs and feed to prevent odor transfer.
🔹 Label clearly; keep an up-to-date SDS accessible to all handlers.
🚚 Transport & Classification
Butyric acid is a regulated dangerous good, shipped under UN 2820 as a Class 8 corrosive liquid, typically Packing Group III. Ensure packaging, labeling and shipping documents comply with the applicable transport rules for your route. The correct grade and its documentation should accompany every shipment - see How to Choose a Butyric Acid Grade, and for the regulatory framework, Butyric Acid Regulatory Status.
💬 Frequently Asked Questions
🔹 Is butyric acid dangerous?
Yes. It is corrosive and classified GHS Danger with hazard statement H314 - it causes severe skin burns and eye damage. It is also a combustible liquid. With proper PPE, ventilation and handling procedures, it can be worked with safely.
🔹 What PPE do I need for butyric acid?
At minimum: chemical splash goggles (plus a face shield for transfers), chemical-resistant gloves, an acid-resistant apron or suit, and adequate ventilation or a suitable organic-vapor respirator. An eyewash and safety shower should be nearby.
🔹 How should butyric acid be stored?
In a cool, dry, well-ventilated area, in tightly closed corrosion-resistant containers with secondary containment, away from heat, sunlight, oxidizers, bases and any foodstuffs or feed. Keep it clearly labeled with an accessible SDS.
🔹 What is the UN number for butyric acid?
Butyric acid ships as UN 2820, a Class 8 corrosive liquid, typically Packing Group III. Confirm the exact transport classification and requirements for your shipping route.
🔹 Does the strong smell mean it is toxic?
The odor is extremely potent and detectable at very low levels, but the smell itself is not the primary hazard - corrosivity is. That said, a strong smell indicates vapor is present, so treat it as a cue to improve ventilation and check your controls. Never use odor as a safety gauge.
📚 Related Reading
📋 Compliance
Butyric Acid Regulatory Status: REACH, TSCA, FCC →The regulatory framework behind the hazard classification and grade documentation.
👃 Chemistry
Why Does Butyric Acid Smell So Bad? →The odor chemistry behind that unmistakable rancid-butter smell - and why it lingers.
🛒 Buyer's Guide
How to Choose a Butyric Acid Grade →Match grade, specification and documentation to your application and market.
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