CR-4 ZINC OXIDE CAS# 1314-13-2

CR-4 Zinc Oxide is used in natural and synthetic rubber compounds as part of the cure system activation. It can also enhance heat aging properties of the vulcanized rubber. It is typically added at a 3.0 – 5.0 phr level early in the mixing process except with polychloroprene compounds.

Packaging: 50 lb. bags

Shelf life: CR-4 is 24 months from the date of manufacture.


Appearance: Fine white powder
*Zinc Oxide

99.9% Min.


30 ppm Max.


10 ppm Max.


10 ppm Max.


10 ppm Max.

*Loss at 110°C

0.07% Max.

*Loss at 825°C

0.20% Max.

*Retained 325 mesh sieve

0.02 Max.

Specific Gravity, typical


Surface Area

4.0 – 5.0 m2/g

Average Particle Size

0.46 – 0.58 microns

Bulk Density

35.0 – 45.0 lb/ft3

*Actual tech data / technical data values reported on Certificate of Analysis  

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      • Akron, OH 44305

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