FCS3

An example of a test standard is an ASTM test method. Recognize that the TDP manufacturer may require additional or a tighter specification than the crumb rubber manufacturer offers. In this case, the TDP manufacturer may need to shop for a suitable crumb rubber. It may also require negotiation with a crumb rubber manufacturer to establish the required specification. Additional cost may be incurred by the crumb rubber producer to offer what amounts to a new or different product. If this is case the TDP manufacturer should expect to pay a premium and possibly to have a minimum order size. Sieve analyses from multiple crumb rubber producers were examined and compared as part of this project. Product specifications may need to include a precise measure of particle size distribution consistent with ASTM D5603. In addition, specifications on metal content, fiber content, moisture content, rubber hydrocarbon content, carbon black content, inorganic material and specific gravity may also be required and can be represented on a product specification sheet, as is presented in Table 2. Figure 3 shows industrial sieves used to separate crumb rubber by particle size. Table 2 Typical Specification Sheet

Specification Sheet

Product: 40 Mesh

Date: 1/1/2012

Customer(s): ABC Company Product Description: Ground rubber from truck tires.

ASTM D5603 Specifications Property

Test Method Units ASTM D5603 NA

Size Value

Tolerance

Grade

NA 1-4

Particle Size

ASTM D5644 % Retained 30

<1

40

<10

Metal Content Fiber Content

ASTM D5603 % ASTM D5603 % ASTM D1509 % ASTM D297 % ASTM D297 % ASTM D297 % ASTM D297 % ASTM D5603 lb/ft 3

NA 0.1 max NA 0.1 max NA 0.5 max NA 8-22 NA 8 max NA 26-38 NA 10-35

Moisture Content

Acetone Extractables ASTM D297 %

Ash

Carbon Black Natural Rubber

RHC

NA 42

Bulk Density

NA 22-28

Other Specifications

Contractor’s Report

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