... No post expansion after cured GNS A22 General Purpose PU Foam1,General Purpose2,Cost Effective3,Value for money4,No ... )25~30Specific Gravity (Kg/M3)12~18PRODUCT DESCRIPTIONGNS General Purpose PU Foam A22 is a one-component, ready ... adaptor head for use with a foam application gun or a straw. The foam will expand ... water sprayer prior to application.3. Fit the gun or straw on the adaptor. Firmly screw the ...