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Educational content for trained professionals. Not a Safety Data Sheet, not medical advice. In an emergency, call your local poison control or emergency services immediately. Terms of use.

Hydrogen iodide

Also known as: Hydriodic acid · HYDROGEN IODIDE · Hydroiodic acid · 10034-85-2

CAS No.
10034-85-2
Formula
HI
Molar mass
127.9124 g/mol
PubChem CID
24841
GHS pictograms
GHS pictogram: Compressed gasCompressed gas
GHS pictogram: CorrosiveCorrosive
GHS pictogram: ToxicToxic
GHS pictogram: Health hazardHealth hazard
2D structure of Hydrogen iodide
2D structure · PubChem CID 24841
New to Safety Data Sheets? What is an SDS · SDS vs MSDS · The 16 sections explained · Read an SDS in 5 min · Compatibility chart

Summary

Hydrogen iodide (HI), CAS 10034-85-2. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.

Background

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Physical properties

Boiling point°C
-35.1
-35.1 °C at 760 mm Hg
Melting point°C
-50.8
-50.8 °C
Densityg/mL
—
Vapor pressuremmHg
5.938
5,938 mm Hg at 25 °C
Vapor density(air = 1)
4.4
4.4 (Air = 1)
Water solubility
—

Sourced from PubChem Experimental Properties. Values may vary between sources and conditions.

Hazards

GHS pictogram: Compressed gas
Compressed gas (GHS04)

Contents under pressure, may explode if heated.

GHS pictogram: Corrosive
Corrosive (GHS05)

Attacks skin, eyes and materials.

GHS pictogram: Toxic
Toxic (GHS06)

May be fatal even in small doses.

GHS pictogram: Health hazard
Health hazard (GHS08)

Serious long-term health effects (CMR, respiratory sensitizer).

Hazard statements

Storage

Temperature

Keep at room temperature, below 30 °C, out of direct heat.

Ventilation

Store somewhere well-ventilated and away from any ignition source.

Containers

Metal drums or tinted glass, tightly sealed.

Keep away from

Strong acids, strong bases and powerful oxidizers.

Personal protective equipment

Gloves

Nitrile or butyl, at least 0.4 mm thick.

Eye protection

Safety goggles with side shields.

Respirator

A2 organic-vapor cartridge if the room isn't well ventilated.

Occupational exposure limits (HSE)

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EU harmonised classification (ECHA C&L)

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Transport

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FDA recalls & enforcement

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Compatibilities

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Practical safety notes

  • Compressed gas. Secure cylinders upright, protect valves, store in ventilated areas.
  • Corrosive. Wear chemical goggles, faceshield and chemical-resistant gloves. Have an eyewash within reach.
  • Acute toxicity. Work under a fume hood, restrict access, keep a specific antidote plan available.
  • Serious health hazard (carcinogen, mutagen, reprotoxic, respiratory sensitizer). Substitute if possible; otherwise closed systems and medical surveillance.

Derived from the GHS classification shown above. These notes are generic guidance and do not replace the manufacturer's SDS or your local risk assessment.

FAQ

Is Hydrogen iodide flammable?+

Hydrogen iodide (CAS 10034-85-2) does not carry the GHS02 flame pictogram in our records. Always confirm with the manufacturer's SDS section 9 (flash point) before assuming a product is non-flammable.

What PPE should I wear when handling Hydrogen iodide?+

Chemical-splash goggles and a faceshield, chemical-resistant gloves (nitrile or butyl) and an apron are the minimum. Work inside a fume hood or use a suitable respirator. Check SDS section 8 for material-specific breakthrough times.

How should Hydrogen iodide be stored?+

Store Hydrogen iodide (CAS 10034-85-2) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials. Segregate acids from bases and keep away from metals that can be attacked.

Is Hydrogen iodide dangerous for the environment?+

No specific environmental pictogram (GHS09) is listed in our records for Hydrogen iodide, but any chemical waste should be handled through your site's hazardous-waste procedure, not poured down the drain.

Where can I find the official Safety Data Sheet for Hydrogen iodide?+

Official, up-to-date SDS documents are published by each manufacturer (Sigma-Aldrich, Merck, Thermo Fisher, VWR, Carl Roth, etc.) and by regulators such as ECHA and NIOSH. This page is an educational summary and does not replace the manufacturer's SDS.

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