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TOPLINK@ 439, substitute for Sartomer SR634, same performance, different cost.

Zinc dimethacrylate is an unsaturated hydroxy acid salt that polymerizes in peroxides and cadmium-magnesium vulcanization systems and is partially grafted onto rubber molecular chains to produce a large number of salt-bonded cross-links, thereby greatly improving the degree of cross-linking of vulcanizates.
Modified Zinc Dimethacrylate improves its dispersion in the rubber compound and reduces the risk of scorch.
 
Toplink® 439 is Modified Zinc Dimethacrylate, a difunctional solid dimethacrylate for general applications requiring enhanced adhesion and scorch retarding. Toplink® 439 is recommended for use in peroxide cured systems for coatings and formulations requiring enhanced adhesion.

ADVANTAGE: 
1. Contains non-nitroso inhibitor package for scorch resistance 
2. High crosslink density 
3. Fast cure response 
4. Improves metal adhesion 
5. increasing hot tear strength 
6. Better elongation, high tear strength, higher tensile strength
7. Much lower cost

 https://drive.google.com/open?id=1hE-yEoUZpW03-ZlvWOb--slmliGTVpwy

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