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.

Functions: Binder & Resin, Impact Modifier, Processing Aid

Chemical Family: Butyl Rubber

Compatible Polymers & Resins: Butyl Rubber (IIR), Ethylene Propylene Diene Monomer (EPDM)

End Uses: Hot Melt Adhesive, Tires

Enhanced TDS

Identification & Functionality

Chemical Family
CASE Ingredients Functions
Plastics & Elastomers Functions


Relative Degree of Cross-Link


Features & Benefits

CASE Ingredients Features
Product Features & Benefits

KALAR® 5246 has controlled cross-linking which makes it an ideal material for soft sealants with a greater degree of creep and slump resistance. Other key performance benefits include:

  • Elimination of butyl rubber pre-mastication
  • Pellets may be metered to facilitate mixing
  • Requires no vulcanization
  • Readily acceptable in a wide range of solvents
  • Extends with high levels of fillers and plasticizers
  • Compatible with a wide choice of compounding ingredients
  • Compounding economy

Applications & Uses

Adhesive & Sealant Type
Plastics & Elastomers End Uses
Product Applications

KALAR® 5246 contains no monomeric materials that often impart an objectionable odor and potential instability under elevated temperature. Although widely used in the sealant industry, KALAR® 5246 is also ideal for a variety of other applications.


Physical Form
Typical Properties
ValueUnitsTest Method / Conditions
Mooney Viscosity (at 127°C)30 - 40-ASTM D1646
Specific Gravity1.05-ASTM D71
Density8.77lb/galASTM D71
Unsaturation1.1Mole %Ozone Analysis
Glass Transition Temperature-70.0°C-

Packaging & Availability

Packaging Type
Regional Availability
  • Global (Excluding Russia)
Typical Packaging

KALAR® 5246 is packaged in 50 lb. fiber boxes.

Storage & Handling

Shelf Life
1 Year
  • The suggested handling procedure varies with the desired product.
  • Coatings and adhesives are produced by adding the pellets to a solvent, mixing with a high-speed homogenizer-dispenser, and adding the rest of the ingredients.
  • Caulks and sealants may be mixed in Sigma blade mixers.
  • Stiff compounds may be mixed in a Banbury or on a two-roll rubber mill.
Storage Conditions
  • KALAR® 5246 product may agglomerate or hard-pack within the boxes, however this will have no effect on chemical or physical properties and the product may be used.
  • Store in a cool, dry environment.