Shaking Canisters
Effect of Not Shaking the Can
Is there a negative effect on the foam if the can is not shaken thoroughly prior to use?
Polyurethane foam consists of a prepolymer and a propellant gas, which form two layers during storage. The can must be shaken vigorously before use to create a homogeneous mixture. Insufficient shaking will result in poor foam properties such as a coarse cell structure and reduced foam volumes.
Degree of Shaking
How much must the cans be shaken to ensure a homogeneous mix of the two constituents?
A canister should be shaken 15 to 20 times.
During Use
Does the canister need to be shaken again during use?
It is recommended to shake the can occasionally during use, and especially after interruptions, to avoid re-separation of the propellant und prepolymer.