Hexamethylene diisocyanate (HDI)
Hexamethylene diisocyanate (HDI) is the most volatile diisocyanate and a
common cause of occupational asthma. One of its main uses is as a spray
paint for vehicles and airoplanes, where it copes with bending of the
underlying metal/plastic. It is often present as a "pre-polymer" or
"blocked" diisocyanate when the presence of a diisocyanate may be
missing from the material data sheet. Despite this occupational asthma
has not been shown to be reduced by using a "blocked" compound.
The Oasys Audit scheme started midway through 2010 and collects agents typed in through the Oasys program. The years before 2010 show old data entered during 2010 or later and are likely to have many fewer notifications. We expect Oasys to become more widely adopted as time goes by so increasing notifications does not necessarily mean an increasing problem.