FCS3

Figure 3 Sieves Used to Separate Crumb Rubber by Particle Size

Sieve Sizes

Industry Standards Industry standards for crumb rubber have been established by ASTM. ASTM D5603 and D5644 focus on particle size, particle size distribution and rubber chemistry. In addition to these two standards there are other material characteristics that may be as important or even more important depending on how the crumb rubber is being used and on what benefits it is providing to the final product. There are several methods for producing crumb rubber that yield crumb rubber with different material characteristics. See Appendix 1 for additional ASTM supportive documentation. ASTM D5603 - Standard Classification for Rubber Compounding Materials—Recycled Vulcanizate Particulate Rubber This method covers the compounding material commercially known as recycled vulcanizate particulate rubber. Recycled vulcanizate particulate rubber is the product that results when vulcanizate rubber has been processed by some means to obtain a desired particle size distribution. ASTM D5603 also provides classification recommendations on particle size distribution, polymer type, chemistry and foreign matter. The guidelines provided by ASTM D5603 are summarized in Table 3.

Contractor’s Report

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