Drums including empty ones should always be kept tightly sealed. The product
should never be allowed to come into contact with water, which reacts with
Desmodur 44V20 L to form polyureas and carbon dioxide. Contact with water
in any form (damp drums, solvents containing water, moist air) must be
prevented not only during storage, but also when removing material from
drums and during processing. Failure to do so may lead to a dangerous build
up of pressure in tanks and drums due to the generation of carbon dioxide. In
addition, polyureas forming in Desmodur 44V20 L can cause solids to separate
out, leading to blockages in the filters, pumps and pipelines of the processing
equipment and resulting in production problems.