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Chloromethane

CAS No.: 74-87-3

Molecular formula: CH3Cl

Molecular weight: 50.49

RTECS No.: PA6300000

HS No.: 2903110000

UN No.: 1063

Hazard cargo No.: 23040

IMDG Page: 2158 

I.Physicochemical properties:

1. Appearance and property: Colorless, combustible, toxic gas, with the ether-like sugar smell.

2. Melting point: -97.7°C

3. Boiling point: -24°C (760mmHg)

4. Liquid weight (D20°): 0.95

5. Solubility: (In water, 25°C): 0.95

6. Explosion limit (In the air V%): 8.1-17.2

7. Maximum allowable concentration: 5mg/m3

II. Usage:

Used in the production of methyl chlorosilane, tetramethyllead, methyl cellulose, and a small amount is used in the production of quaternary ammonia compounds, pesticide, and used as solvent in the production of butyl rubber.

III. Quality standard

Implement Q/73484587-0.2-2002 business standard

Item

Index

Superior

First class

Qualified

Purity a/%  ≥

99.6

99.1

98.60

Residue after evaporation/%  ≤

0.003

0.005

0.008

Moisture/%  ≤

0.040

0.070

0.10

Acidity (Calculated by HCl) /% ≤

0.0015

0.005

0.008

Color/Hazen unit (Pt-Co color No.)   ≤

10

15

25

Colorless transparent liquid, no suspended matter

IV. Precautions:

This product is toxic, inhalation of it can cause dizziness and nausea. Maximum allowable concentration is 80mg/ m3 in working place. The operator should wear the protective equipment to avoid contact with it. In case of contact with skin, rinse immediately with plenty of water; if inhalation, rapidly from the scene to fresh air, seek medical attention.

V. Packing, storage and transportation

Hazard rank: 2.3 type toxic gas

Hazard cargo packing mark: 6; 32

Packing type: II

Packing materials: Steel cylinder or tank car

Precautions: Inflammable compressed gas. Stored in cool and ventilated warehouse. The warehouse temperature should be lower than 30°C. Away from fire, and heat, avoid direct sun light. Should be separated with oxygen, compressed air, oxidant, etc. The lighting, ventilating equipment in the warehouse must explosion proof and the switch should be installed outside the warehouse. The warehouse shall have the corresponding fire-fighting equipment. The fireproofing and explosion proofing measures are required during tank storage and cooling measures are required during the tank storage open-air in summer. Prohibition of the use of mechanical equipment or tools which is easy to produce a spark, shall not stay in the residential area and congested area.

ERG guide: 115

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