Safety Data Sheet Quick Reference
Quick reference for essential safety information for common chemicals used in metallography laboratories.
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IMPORTANT: This is a QUICK REFERENCE only. This is NOT a substitute for complete Safety Data Sheets (SDS). Always refer to the complete SDS provided by the manufacturer for comprehensive safety information, handling procedures, and emergency response details.
Nitric Acid (HNO₃)
CAS: 7697-37-2
Hazards:
Corrosive, oxidizing, toxic
Storage:
Store in cool, dry, well-ventilated area. Keep away from organic materials, reducing agents, and metals.
Handling:
Use in fume hood. Wear acid-resistant gloves, safety goggles, and lab coat. Avoid contact with skin and eyes.
First Aid:
Eyes: Flush with water for 15 minutes. Skin: Remove contaminated clothing, flush with water. Inhalation: Move to fresh air. Seek medical attention.
Disposal:
Neutralize with base (sodium carbonate) before disposal. Follow local regulations.
Hydrochloric Acid (HCl)
CAS: 7647-01-0
Hazards:
Corrosive, toxic, releases toxic fumes
Storage:
Store in cool, dry, well-ventilated area. Keep away from bases, oxidizing agents, and metals.
Handling:
Use in fume hood. Wear acid-resistant gloves, safety goggles, and lab coat. Avoid contact with skin and eyes.
First Aid:
Eyes: Flush with water for 15 minutes. Skin: Remove contaminated clothing, flush with water. Inhalation: Move to fresh air. Seek medical attention.
Disposal:
Neutralize with base (sodium carbonate) before disposal. Follow local regulations.
Hydrofluoric Acid (HF)
CAS: 7664-39-3
Hazards:
Highly corrosive, toxic, bone-seeking. Causes deep tissue damage that can be DELAYED — small painless splashes can still cause systemic hypocalcemia and death hours later.
Storage:
Store in HF-compatible polyethylene or polypropylene containers (NEVER glass — HF etches glass). Cool, dry, well-ventilated area. Secondary containment.
Handling:
Calcium gluconate 2.5% gel must be within arm's reach BEFORE opening any HF container — locating it during exposure is too late. Use only in a fume hood. Wear HF-rated nitrile or neoprene gloves over standard nitrile, full face shield, splash apron, and lab coat. Apply by swab; never immerse a finger to wipe.
First Aid:
IMMEDIATE MEDICAL ATTENTION REQUIRED EVEN FOR PAINLESS EXPOSURE. Skin: flush with water for 5 minutes, then apply calcium gluconate gel and massage into the affected area; continue applying gel and seek emergency care. Eyes: flush with water for at least 15 minutes; do NOT use gluconate gel in the eyes — seek emergency care immediately. Inhalation: move to fresh air; emergency care immediately.
Disposal:
Neutralize with calcium carbonate, calcium hydroxide, or lime. Follow strict local regulations.
Picric Acid
CAS: 88-89-1
Hazards:
Explosive when dry — shock, friction, or heat can detonate dry crystals. Forms shock-sensitive picrate salts with metals. Toxic by ingestion and skin absorption.
Storage:
Store wetted with at least 30% water by weight (visible water layer). Use plastic or amber-glass bottles with plastic-lined caps — NEVER metal caps or metal-lined closures. Keep away from copper, lead, zinc, and other metals (reactive metals form shock-sensitive picrate salts). Store away from heat, sparks, oxidizers, and reducing agents. Inspect periodically for water-layer loss; refill before crystals dry out.
Handling:
Verify the bottle is wetted (water layer visible) BEFORE opening. Mix in a fume hood; standard PPE — gloves, splash goggles, lab coat. Avoid friction, shock, and heat. Never grind dry crystals; never evaporate to dryness.
First Aid:
Eyes: Flush with water for 15 minutes. Skin: Wash with soap and water (yellow staining indicates contact). Inhalation: Move to fresh air. Ingestion: Do not induce vomiting; seek medical attention.
Disposal:
Keep wetted. Collect for organic-acid hazardous-waste pickup. Do not allow to dry. Bottles found with crusted necks or dried crystals should NOT be opened — call hazardous-materials specialists for safe handling.
Ethanol
CAS: 64-17-5
Hazards:
Flammable, toxic
Storage:
Store in cool, well-ventilated area away from heat, sparks, and flames. Keep containers tightly closed.
Handling:
Use in well-ventilated area. Wear gloves and safety goggles. Avoid open flames and ignition sources.
First Aid:
Eyes: Flush with water. Skin: Wash with soap and water. Inhalation: Move to fresh air. Ingestion: Do not induce vomiting, seek medical attention.
Disposal:
Follow local regulations. Can often be disposed of as flammable waste.
Sodium Hydroxide (NaOH)
CAS: 1310-73-2
Hazards:
Corrosive, caustic, toxic
Storage:
Store in cool, dry area. Keep away from acids, water, and moisture. Store in tightly closed containers.
Handling:
Wear alkali-resistant gloves, safety goggles, and lab coat. Avoid contact with skin and eyes. Use in well-ventilated area.
First Aid:
Eyes: Flush with water for 15 minutes. Skin: Remove contaminated clothing, flush with water. Seek medical attention.
Disposal:
Neutralize with acid before disposal. Follow local regulations.
Potassium Dichromate (K₂Cr₂O₇)
CAS: 7778-50-9
Hazards:
Oxidizing, toxic, carcinogenic, environmental hazard
Storage:
Store in cool, dry area away from reducing agents and organic materials. Keep containers tightly closed.
Handling:
Use in fume hood. Wear gloves, safety goggles, and lab coat. Avoid contact with skin and eyes. Avoid inhalation of dust.
First Aid:
Eyes: Flush with water. Skin: Wash with soap and water. Inhalation: Move to fresh air. Seek medical attention.
Disposal:
Follow strict local regulations. Chromium compounds require special disposal procedures.
Copper Chloride (CuCl₂)
CAS: 7447-39-4
Hazards:
Toxic, irritant, environmental hazard
Storage:
Store in cool, dry area. Keep containers tightly closed.
Handling:
Wear gloves, safety goggles, and lab coat. Avoid contact with skin and eyes. Avoid inhalation of dust.
First Aid:
Eyes: Flush with water. Skin: Wash with soap and water. Inhalation: Move to fresh air. Seek medical attention if symptoms persist.
Disposal:
Follow local regulations. Copper compounds may require special disposal.
Ferric Chloride (FeCl₃)
CAS: 7705-08-0
Hazards:
Corrosive, toxic, irritant
Storage:
Store in cool, dry area. Keep containers tightly closed. Hygroscopic - keep away from moisture.
Handling:
Wear gloves, safety goggles, and lab coat. Use in well-ventilated area. Avoid contact with skin and eyes.
First Aid:
Eyes: Flush with water. Skin: Remove contaminated clothing, flush with water. Inhalation: Move to fresh air. Seek medical attention if symptoms persist.
Disposal:
Neutralize before disposal. Follow local regulations.
Ammonium Hydroxide (NH₄OH)
CAS: 1336-21-6
Hazards:
Corrosive, toxic, releases ammonia vapors
Storage:
Store in cool, well-ventilated area. Keep containers tightly closed. Store away from acids.
Handling:
Use in fume hood. Wear gloves, safety goggles, and lab coat. Avoid contact with skin and eyes. Avoid inhalation of vapors.
First Aid:
Eyes: Flush with water. Skin: Flush with water. Inhalation: Move to fresh air. Seek medical attention if symptoms persist.
Disposal:
Neutralize with acid before disposal. Follow local regulations.
Hydrogen Peroxide (H₂O₂)
CAS: 7722-84-1
Hazards:
Oxidizing, corrosive, can decompose violently
Storage:
Store in cool, dark area away from heat and organic materials. Keep containers tightly closed. Store away from reducing agents.
Handling:
Wear gloves, safety goggles, and lab coat. Use in well-ventilated area. Avoid contact with skin and eyes. Do not mix with organic materials.
First Aid:
Eyes: Flush with water. Skin: Flush with water. Inhalation: Move to fresh air. Seek medical attention if symptoms persist.
Disposal:
Dilute before disposal. Follow local regulations.
Sulfuric Acid (H₂SO₄)
CAS: 7664-93-9
Hazards:
Highly corrosive, toxic, dehydrating
Storage:
Store in cool, dry, well-ventilated area. Keep away from bases, oxidizing agents, and organic materials.
Handling:
Use in fume hood. Wear acid-resistant gloves, safety goggles, face shield, and lab coat. Avoid contact with skin and eyes.
First Aid:
Eyes: Flush with water for 15 minutes. Skin: Remove contaminated clothing, flush with water. Inhalation: Move to fresh air. Seek immediate medical attention.
Disposal:
Neutralize with base (sodium carbonate) before disposal. Follow local regulations.
Acetic Acid
CAS: 64-19-7
Hazards:
Corrosive, flammable, toxic
Storage:
Store in cool, well-ventilated area away from heat, sparks, and flames. Keep containers tightly closed.
Handling:
Use in well-ventilated area. Wear gloves, safety goggles, and lab coat. Avoid contact with skin and eyes.
First Aid:
Eyes: Flush with water. Skin: Flush with water. Inhalation: Move to fresh air. Seek medical attention if symptoms persist.
Disposal:
Neutralize before disposal. Follow local regulations.
Glycerol
CAS: 56-81-5
Hazards:
Low hazard, may cause mild irritation
Storage:
Store in cool, dry area. Keep containers tightly closed.
Handling:
Wear gloves and safety goggles. Generally low hazard but avoid prolonged contact.
First Aid:
Eyes: Flush with water. Skin: Wash with soap and water. Generally low hazard.
Disposal:
Follow local regulations. Generally can be disposed of as regular waste.
Perchloric Acid (HClO₄)
CAS: 7601-90-3
Hazards:
Strong oxidizer. Anhydrous or hot perchloric mixed with organic solvents (alcohols, acetic anhydride, glycerol) is EXPLOSIVE. Even cold dilute perchloric vapors accumulate explosive residues in ordinary fume-hood ductwork over time.
Storage:
Store in original glass container in a perchloric-acid-only cabinet, away from organic materials, reducing agents, dehydrating agents, and metals. Do NOT store on a wood shelf or near combustibles. Inspect for crystallization or discoloration — discolored acid must be removed by hazardous-waste specialists.
Handling:
Use ONLY in a perchloric-rated wash-down fume hood with dedicated ductwork — NEVER a standard organic-chemistry fume hood. For metallographic electropolishing, use a chilled commercial cell (Lectropol, etc.) rather than benchtop mixing. Wear acid-resistant gloves, full face shield, splash apron, and lab coat. Add acid to water slowly, with cooling.
First Aid:
Eyes: Flush with water for at least 15 minutes; emergency care. Skin: Remove contaminated clothing, flush copiously with water; emergency care for any thermal/chemical burn. Inhalation: Move to fresh air, emergency care.
Disposal:
Never pour perchloric down a drain shared with organic waste. Collect for inorganic-oxidizer hazardous waste pickup. Standard fume hoods that have seen perchloric work require specialist decontamination before disposal.
Dangerous mixtures specific to metallography
The hazards above describe each chemical individually. Most metallographic etchants are mixtures, and some of those mixtures introduce hazards that don't appear in any single component's SDS. The following are the load-bearing rules every metallography lab should treat as non-negotiable.
Perchloric acid + organic solvents
Anhydrous or hot perchloric mixed with alcohols, acetic anhydride, glycerol, or other organics is EXPLOSIVE. Use only in a perchloric-rated wash-down hood, ideally in a chilled commercial electropolishing cell. Do NOT mix on the bench.
Murakami's reagent + acid
Potassium ferricyanide + any acid releases hydrogen cyanide gas. Murakami's is alkaline (NaOH + K₃Fe(CN)₆); never combine with acidic etchants and never dispose down the same drain as acid waste.
Aqua regia (3 HCl : 1 HNO₃)
Decomposes after mixing — generates NOₓ + Cl₂ + NOCl, and pressurizes a sealed container until it ruptures. Mix in a fume hood, in small volumes, immediately before use. NEVER store the mixture. Same rule for Glyceregia.
NH₄OH + H₂O₂ (copper/brass etch)
Decomposes rapidly; activity decays in minutes and a sealed container can rupture from gas evolution. Mix in an open beaker immediately before use. Discard within hours; never store.
Picric acid + metals
Picric acid forms shock-sensitive picrate salts with copper, lead, zinc, and iron. NEVER store in metal-capped bottles or near metallic fixtures. Use plastic-lined caps only.
Hot acids (>50 °C)
Fume generation rises dramatically with temperature. Wherever possible, increase concentration rather than temperature, or use a longer etch at room temperature.
IMPORTANT SAFETY NOTES
- This is a QUICK REFERENCE only. Always refer to complete Safety Data Sheets (SDS) from manufacturers.
- Have emergency eyewash stations and safety showers readily accessible.
- Know the location of fire extinguishers and emergency exits.
- Always work in well-ventilated areas or fume hoods when handling chemicals.
- Wear appropriate Personal Protective Equipment (PPE) as specified in SDS.
- Never mix incompatible chemicals (e.g., acids and bases, oxidizers and reducers).
- Store chemicals according to compatibility groups.
- Always pour acid into water, never water into acid.
- For HF work, calcium gluconate gel must be within arm's reach BEFORE opening any HF container.
- For picric acid, verify the bottle is wetted before opening; bottles with crusted necks or dried crystals are not safe to open.
- Keep emergency contact numbers readily available.
- Report all accidents and incidents immediately.
- Follow local regulations for chemical storage, handling, and disposal.
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