SAAB WIS ONLINE

(101-2056) Handling of isocyanates

TECHNICAL SERVICE BULLETIN
Bulletin Nbr: 101-2056
Date: ........... OKTOBER 1998
Market: SE
Handling of isocyanates

Background

Various studies, which have been performed as part of a project analysing isocyanates and amines in the car industry, have shown that varying quantities of isocyanates are briefly produced during high temperature work (such as welding, drilling, cutting and grinding painted metal). This can constitute a health risk, not just for the person performing the work but also for those in the immediate surroundings.

Procedure

To minimize the risk of isocyanates from being produced, the paint must be removed using a low speed grinder from 10 cm around the point at which high-temperature work is to be carried out.

Important

Bear in mind that the reverse of panels and the inside of members are painted. Provide adequate local extraction in these areas.


The handling of products containing isocyanates varies with regards to health risks. However, when handling such materials standards regarding Thermosetting plastics must be followed.

There is no need to change present procedures for the fitting of window glass, as there is no evidence that work with glass adhesives is one of the "very dangerous" tasks.

Removing window glass using heat emitting tools does however produce isocyanates. Follow therefore the method described in Saab's workshop information.

Protective equipment

For all so-called "high-temperature" work (heating to temperatures of approx. 170° C or above), where polyurethane or isocyanates are present, the work must be regarded as presenting a risk or high risk of exposure to isocyanates, with subsequent health risks if protective equipment is not used.

Respiratory protection, at a minimum a respirator with carbon filter and dust filter P3 , must be used. If large amounts of fumes are produced or if two component products (with free isocyanates) are used, an oxygen supply/welding mask with oxygen supply should be used.

Work must be performed in premises that comply with thermosetting plastic regulations. In large premises, part of the premises should be screened off so that those in the surroundings are not unnecessarily exposed to isocyanates.

Continuous inspection

The working environment shall be regularly inspected, in accordance with Internal Control of the Working Environment AFS 1996:6 .