Closed cell sponge

Closed-cell sponge is used in a number of articles such as insulation and shock absorbing media and in seals of various types. 

There is a great difference between a compressible expansion joint material and a deformable joint material. A true compressible material is one that can be squeezed together without extruding from the joint. The majority of the useful compressible joint fillers are closed-cell sponges or foams of the type best suited for the environment in which they will be employed. (They are required in totally enclosed joints where materials may not be extruded without disrupting the masonry.) They are installed by compressing them about 25% of their volume and then sliding them into the joint. 

If the joint Is made in this manner in a food plant, such as a dairy, and milk (or other fluid food) penetrates the joint, it will form a static pool on top of a properly installed membrane, in the area of the joint, and slowly become rancid or ferment, creating odors, and causing troubles with the food inspector. For this reason, it is common practice in food areas to fill the entire joint with deformable material rather than use closed-cell sponge at the bottom, leaving no void in which the milk (or other food materials) can collect. As the joint closes, the sealant is extruded at the joint top. Any excess can be removed with a sharp knife leaving the joint full, but not protruding. 

Monex . [Uniroyal] Thiuram accelerator for tires, air-cured footwear, molded soling, closed-cell sponge, insulated wire. 

Processes and ingredients used in the manufacture of rubber latex foams and open- and closed-cell sponge rubber are described. 11 refs. 

Some other applications are rollers for the printing and textile industry, coated fabrics, membranes, air bags, tank linings, closed cell sponge surf, and diving suits. 

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