Excellent Strength to Weight
Our #624/625 is a two-part, equal mix, self-rising, 6lb/cu. ft. density closed-cell foam system. When compared to lower density foams, 6# Mix and Pour Foam offers superior compressive strength for void filling. It is often used to make more detailed plugs and sculptures due to its higher density and smaller cell structure. It can also be used to make millwork, WWTP floats or coast guard buoys.
Foaming begins within 60 seconds after the two liquids are mixed and continues for several more minutes. The foam expands approximately 10 times its liquid volume before curing, and will fill any shape cavity. It does not react with oil or gasoline and it will not absorb water. With a compressive strength of 120psi, #624/625 is ideal for structural void filling applications. Unlike polyester foams, polyurethane foam is compatible with both polyester and epoxy resins. Polyurethane foam can be pigmented using urethane pigments, and is paintable using standard latex based paints.
When filling cavities for purposes of insulation, flotation or reinforcement; estimate the volume of the cavity and multiply the volume (in cubic feet) by 7.5 to determine the number of pounds of foam to mix. For instance if you wish to fill a cavity measuring 1ft. by 1ft. by 2ft., the cavity has a volume of 2 cubic feet. Multiplying that volume by 7.5 indicates you need 15 pounds of foam mix (7.2 lb. #624 and 7.8 lb. #625).
When properly mixed, this foam is designed to meet USCG Title 33, Chapter 1, Part 183.