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Crumb Rubber Particle Size Measurement
Name:Crumb Rubber Particle Size Measurement



Crumb Rubber Particle Size Measurement

Different crumb rubber market segments have different crumb rubber size requirements. Within a specific crumb rubber market, each application has its own requirements in terms of particle size and purity.

Although ASTM International, formerly known as the American Society for Testing and Materials (ASTM), has standards for specifying different size ranges of crumb rubber, such as 30 mesh or 80 mesh, it is often necessary for crumb rubber manufacturers to have a more detailed knowledge of the range of particle sizes, not just the maximum size. To accomplish this, some method of particle size determination is necessary.

Sieve analysis is the most common technique for determining particle size measurement. It consists of shaking and tapping a measured quantity of crumb rubber sample through a specified number of test sieves over a specified time. The amount of sample retained on each screen is weighed and results are given as the percentage of sample retained on each screen. The recommended procedure for sieve analysis using the Rotap method is provided in ASTM 5644. 

 

Inch, Millimeter, Mesh

In addition to sieve analysis, crumb rubber manufacturers need to understand the relationship between the inch, millimeter and mesh units of measure. There are some readily available tools commonly used in the crumb rubber processing industry to help crumb manufacturers. One such tool is the "inch to mm to mesh" chart. A sample listing from the chart shows sieve designations for test sieve openings expressed in inches, millimeters and mesh. In the example shown particles that are smaller than .111 inch or 2.80 mm in diameter, will fall through a 7 mesh screen. Processors also use ASTM specification E-11 "Standard Specification for Wire Cloth and Sieves for Testing Purposes" to conduct sieve analysis of crumb rubber. Another very useful chart is the dime chart. This compares a magnified dime to different particle sizes.

Crumb Rubber Standards

ASTM International, formerly the American Society for Testing and Materials (ASTM) produces the largest voluntary standards development systems in the world. This not-for-profit organization publishes thousands of standards per year used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. Working in an open and transparent process, ASTM producer, user and consumer members participate in developing industry standards, test methods, specifications, guides and practices that support industries and governments worldwide.

There are several ASTM standards that apply to crumb rubber:

ASTM D5603 Standard Classification for Rubber Compounding Materials-Recycled Vulcanizate Particulate, classifies vulcanized particulate rubber according to maximum particle size, size distribution and parent materials including whole tires, tire peels, buffings generated from the tire tread and shoulder, buffings generated from tire tread, shoulder and sidewall and non-tire rubber.

ASTM D5644 Test Methods for Rubber Compounding Materials-Determination of Particle Size Distribution of Recycled Vulcanizate Particulate Rubber, discusses methods of determining particle size and particle size distribution for crumb rubber. The standard refers to the use of a mechanical sieve shaker for determining particle size and particle size distribution for crumb rubber and gives experimental details of running the test. Particle size and particle size distribution of recycled rubber depends on the end use of the material and may affect its handling, processing, and properties. Therefore, methods for analyzing particle size and particle size distribution are important tools for the rubber recycling industry. 


 

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