KALAR® 5215 is a partially cross-linked butyl rubber compound pelletized for easy handling. KALAR® products feature all the performance attributes expected of butyl rubber. KALAR® 5215 is off-white in color and is a moderately cross-linked butyl rubber, providing an excellent butyl intermediate base for general-purpose sealants and tapes.

KALAR® 5246 is a partially cross-linked butyl rubber compound pelletized for easy handling. KALAR® products feature all the performance attributes expected of butyl rubber. KALAR® 5246 is off-white in color and is the least cross-linked butyl rubber of the KALAR® series of products, providing an excellent butyl intermediate base for general-purpose sealants and tapes. Its controlled cross-linking facilitates easily compounded sealants that can be applied with a minimum of effort.

KALAR® 5263 is a partially cross-linked butyl rubber compound pelletized for easy handling. KALAR® products feature all the performance attributes expected of butyl rubber. KALAR® 5263 is amber in color and is a more tightly cross-linked butyl rubber than KALAR® 5215. It is designed as the starting point product for butyl sealants that require higher modulus and/or superior durability at elevated temperatures.