Covestro (formerly Bayer) Desmodur W H12MDI dicyclohexylmethane diisocyanate hydrogenated MDI HMDI 5124-30-1

Type	fat Cyclic Diisocyanate Monomer
Chemical Description	Asia Methyl bis(4-cyclohexyl isocyanate) or dicyclohexylmethane diisocyanate or H12MDI
Molecular formula	OCN-C6H10-CH2-C6H10-NCO
Molecular Weight	262
equivalent	131
CASIndex number	5124 —30 —1
Use	Use For the preparation of polyisocyanates and polyurethanes

Product Specifications

Features

Security
Since this product is an isocyanate monomer, special care should be taken when handling it.
This product safety information needs to be read carefully, it contains label posting, transportation, storage and product disposal, product safety and ecological impact information. Please also note the supplementary data in the technical documentation. Furthermore, the current national regulations governing the handling of polyisocyanates must be observed and observed.
In Germany, the maximum permissible concentration of Desmodur W for occupational exposure (sum of vapor and smoke) is 0.054 mg/m3 (8-hour TWA). Do not exceed this limit value, even for short periods of time. Remarks: H (= able to be absorbed through the skin) (TRGS00, October 2000).
In the United Kingdom, the maximum allowable concentration of incidental exposure (based on 8-hour TWA) for all isocyanates is 0.02 mg/m3. The maximum allowable concentration for short-term exposure (based on 10-minute STEL) is 0.07 mg/m3, and this data is based on isocyanate content. In other countries, the maximum allowable concentration for methylene bis-(4-cyclohexyl isocyanate) should be reported Inquire with local authorities.
Avoid skin and eye contact with this product or inhalation of its vapor. Also avoid the formation of fumes, eg when purging mixing equipment with air streams, or by opening safety valves on pressurized containers.
When handling Desmodur W products, protective gloves of different materials must comply with the following requirements:

	Thickness	Penetration time
Butyl Rubber－IIR	≥0.5	≥480 min
Viton-FKM	≥0.4	≥480 min
Nitrile Rubber－NBR	≥0.35	≥480 min

Safety goggles, protective gloves and overall protective clothing must be worn. Contaminated clothing must be removed and disposed of immediately. When working in poorly ventilated conditions, especially when dealing with large quantities of open products, it is necessary to wear a gas mask (for a short time, a mask that filters harmful gases; for a long time, in poorly protected conditions) work, must be equipped with an assisted breathing system that can work independently).
If the smell of Desmodur W is smelled, it means that the maximum permissible air concentration has been exceeded and the exposed area should be evacuated immediately.

For a long time, you can wear a mask that can filter harmful gases; for a long time, you must be equipped with an auxiliary breathing system that can work independently if you work under poor protection conditions).
If the smell of Desmodur W is smelled, it means that the maximum permissible air concentration has been exceeded and the exposed area should be evacuated immediately.

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