Anti-foam AF-4 is a "surface tension relieving" agent recommended as an additive for urethane elastomer systems. Its purpose is to assist in the vacuum degassing procedure (deaeration), by reducing the surface tension on entrained air bubbles in the resin mixture. Also, it assists in better resin flow and wet out in molds. Anti-foam is completely silicone free and does not affect the color, appearance or bond ability of cured urethane parts.
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