50 Questions About Isopropyl Alcohol & Surgical Spirit, Answered

This is a structured reference of fifty common questions about isopropyl alcohol (IPA) and surgical spirit — what they are, what concentrations exist, where each is used, how to handle and store them, and how distributors source them in bulk. Each answer is short, direct and self-contained. For deeper context, see The Complete Guide to Isopropyl Alcohol & Surgical Spirit or the shorter Isopropyl Alcohol FAQ.

Basics

1. What is isopropyl alcohol?

Isopropyl alcohol (IPA), also called 2-propanol or isopropanol, is a clear, colourless flammable liquid alcohol used as a solvent, cleaner and disinfectant. Chemical formula: (CH₃)₂CHOH.

2. Is isopropyl alcohol the same as rubbing alcohol?

Rubbing alcohol typically contains 70% isopropyl alcohol in water. So they are related but not identical — rubbing alcohol is a specific consumer product, IPA is the chemical.

3. What is surgical spirit?

Surgical spirit is denatured ethanol with added methyl salicylate and methylene blue. It is similar in use to 70% IPA for external antiseptic purposes but is not interchangeable with pharma-grade IPA in clinical compounding.

4. What is the difference between isopropyl alcohol and ethanol?

Both are alcohols and good solvents/disinfectants. IPA is slightly more effective at lower concentrations against many pathogens; ethanol is approved for human consumption (in beverages) while IPA is not.

5. Is methylated spirit the same as surgical spirit?

No. Methylated spirit is denatured ethanol intended for industrial use. Surgical spirit has additional ingredients (methyl salicylate) for external skin use.

6. What does "IPA" mean in chemistry?

Isopropyl alcohol (also called isopropanol or 2-propanol). Not to be confused with India Pale Ale (the beer style) in casual conversation.

7. What is the smell of isopropyl alcohol?

A sharp, characteristic alcohol smell — similar to but distinct from ethanol. Many people describe it as more "chemical" or "medicinal" than drinking alcohol.

Concentrations and grades

8. What concentrations of IPA are common?

70% (most common antiseptic and disinfectant strength), 90–91% (intermediate), and 99–100% (anhydrous, for electronics and water-sensitive applications). Lower dilutions are sometimes prepared for specific uses.

9. Why is 70% IPA the standard for disinfection?

Water helps the alcohol penetrate microbial cell walls and slows evaporation, giving more contact time. Pure or near-pure IPA evaporates too fast for effective kill. See our note on why 70% is the standard.

10. Is 99% IPA better at disinfection than 70%?

No, generally worse for surface disinfection. 99% evaporates too quickly and has less water to help penetrate cell walls. See our IPA 70% vs 99% comparison.

11. When should I use 99% IPA?

Electronics cleaning (water-sensitive components), optics, anhydrous lab applications, and as a feedstock for diluting to lower concentrations on site.

12. What is pharma-grade IPA?

IPA that meets a pharmacopoeial monograph (IP/BP/USP) with full Certificate of Analysis. Pharma 70% uses purified water for the dilution; industrial-grade is for non-clinical use.

13. What is industrial-grade IPA?

IPA without pharma-grade documentation. Used for cleaning, manufacturing solvent, and other non-clinical applications. Cheaper than pharma-grade.

14. Is denatured IPA available?

Less common than denatured ethanol. Denatured IPA (with added bittering or marker) exists for some industrial uses where excise savings matter.

15. What is reagent-grade IPA?

High-purity IPA (99.5%+) meeting analytical reagent specifications for laboratory use. Even tighter purity than electronics-grade in some respects.

Uses

16. What is isopropyl alcohol used for?

Surface disinfection, skin antiseptic, electronics cleaning, glass and lens cleaning, removing adhesive residue, paint and resin solvent, and a feedstock for chemical manufacturing.

17. Can IPA disinfect skin?

Yes. 70% IPA on intact skin is an effective antiseptic — used routinely before injections and minor procedures.

18. Can IPA disinfect surfaces?

Yes. 70% IPA is effective against many bacteria and viruses with adequate contact time. Pre-clean visible dirt before disinfecting.

19. Can IPA clean electronics?

Yes — 99% IPA is the standard solvent for electronics cleaning because it leaves no water residue. Allow to evaporate fully before reapplying power.

20. Can IPA remove permanent marker?

Often yes — 70% or higher IPA dissolves many marker inks on non-porous surfaces. Test in a hidden spot for surface compatibility first.

21. Can IPA remove sticker adhesive?

Partially. IPA works on water-soluble adhesives; for stronger adhesives (heavy-duty tape) a citrus-based remover works better. See our troubleshooting guide on IPA cleaning.

22. Can IPA be used to clean a phone screen?

70% IPA on a microfibre cloth (not sprayed directly on the device) is acceptable for most smartphone screens. Check the manufacturer's guidance.

23. Can IPA be used to clean eyeglasses?

Not recommended for plastic lenses (can damage anti-reflective coatings). Use lens-specific cleaners or warm soapy water for plastic lenses.

24. Can IPA be used to clean wounds?

70% IPA stings considerably on open wounds and is not the modern first-aid choice. Wash with mild soap and clean water; cover; see a doctor for non-trivial wounds.

25. Can IPA be used in hand sanitizer?

Yes. Many alcohol-based hand sanitizers use IPA, ethanol, or a blend. WHO formulations include both options. Concentrations of 60–80% in the finished gel are effective.

26. Can IPA be used to defrost a car windscreen?

Pure IPA depresses the freezing point and clears light frost. Spray 70%+ IPA on a frosty windscreen and wipe.

27. Can IPA be used as a paint thinner?

For some water-based and shellac paints, yes. For oil-based and most enamels, mineral spirits or specific thinners are required.

Safety

28. Is isopropyl alcohol flammable?

Yes. IPA has a flash point around 12°C — well below room temperature. Keep away from open flames and store away from heat sources.

29. Is isopropyl alcohol toxic?

IPA is more toxic than ethanol when ingested. Swallowing meaningful quantities causes intoxication, respiratory depression and organ damage. Keep away from children.

30. Can IPA be absorbed through skin?

Minimal absorption through intact skin in short contact. Prolonged or repeated occlusive exposure can cause dryness, irritation, and some systemic absorption.

31. Is it safe to inhale IPA?

Brief exposure to vapours is generally low-risk. Prolonged inhalation of concentrated vapours causes headache, dizziness and respiratory irritation. Use in ventilated areas.

32. Can IPA cause skin irritation?

Yes — particularly with repeated or prolonged contact. The alcohol strips skin oils and can cause dryness, cracking, and contact dermatitis.

33. What should I do if IPA contacts eyes?

Rinse with cool running water for at least 15 minutes; seek medical care if irritation persists.

34. What should I do if IPA is swallowed?

Do not induce vomiting; seek emergency medical care. Even modest quantities can cause significant intoxication and harm.

35. What should I NOT mix with IPA?

Do not mix with bleach (hazardous reaction), concentrated peroxide (peracetic-acid formation risk), or strong acids. See our note on what not to mix with IPA.

Storage and shelf life

36. How should IPA be stored?

In closed containers, away from heat, sparks and open flames, in a cool well-ventilated area, away from oxidisers. Above modest threshold quantities, fire-safety storage requirements apply.

37. Does IPA evaporate quickly?

Yes — 99% IPA evaporates very fast at room temperature. 70% IPA evaporates slower because of the water content. Always keep containers closed.

38. How long does IPA last unopened?

Well-stored 99% IPA: typically 2+ years from manufacture. 70% pharma: 24 months from manufacture.

39. How long does IPA last after opening?

If well-sealed, 12+ months. Open dispensers lose alcohol through evaporation — replace from sealed bulk every few weeks for institutional use.

40. What does expired IPA look like?

Expired IPA may not look different. A faint reduced alcohol smell can indicate evaporation losses. For pharma use, periodic assay is the definitive check.

Buying and supply

41. Where can distributors source bulk IPA in India?

Several specialty chemical manufacturers and bulk distributors in India supply pharma and industrial grades. See our bulk IPA 70% supplier guide for pharma and diagnostics.

42. What is the typical MOQ for bulk IPA?

For pharma-grade: one 200L drum or four 25L drums. For industrial-grade: often available in smaller quantities through chemicals distributors.

43. What is the 2026 price range for IPA in India?

Indicative 2026: 70% pharma in 25L drums ₹140–200 per litre; 99% industrial in 200L drums ₹110–170 per litre. See our 2026 IPA price analysis.

44. What documents should accompany a bulk IPA order?

Certificate of Analysis (assay range, specific gravity, refractive index, residue on evaporation), Material Safety Data Sheet, transport declaration (UN 1219 for IPA, packing group II).

45. How is bulk IPA packaged?

5L jerrycans (HDPE), 25L drums (HDPE), 200L drums (HDPE), 1000L IBCs (HDPE). Pharma-grade typically in food-grade HDPE; industrial in standard HDPE.

Standards and regulatory

46. What standards apply to IPA in India?

Indian Pharmacopoeia monograph for pharma-grade 70% IPA. BIS specification IS 1334 for industrial-grade. State excise rules apply for transport and warehousing of large quantities.

47. Does a distributor need a licence to sell IPA?

For pharma-grade, a state drug-licence stockist permit. For industrial alcohol above threshold quantities, state excise registration and storage approval.

48. Is IPA covered by GST?

Yes. IPA is taxed under GST at the applicable rate (typically 18% for industrial chemicals, with specific rates for pharma-grade depending on packaging and intended use).

49. How is IPA assayed?

Gas chromatography is the modern method. Specific gravity and refractive index are simpler indicators of purity but less specific. Pharmacopoeial methods include identity tests and limit tests for specific impurities.

50. What is the UN dangerous-goods classification for IPA?

UN 1219, IATA/IMDG Class 3 (flammable liquid), packing group II. This affects transport, labelling and insurance.

Pioma Chemtech, a specialty chemical manufacturer based in India, supplies isopropyl alcohol 70%, 99% and surgical spirit in bulk to distributors, pharmacies and institutional buyers. For further reading see the complete IPA guide.