Production of Rubber Crumb

Irrespective of whether the source of waste rubber is whole tyres, tread buffings or GRG, the crumbing operation is sometimes carried out under cryogenic conditions (i.e., it is cooled to below around 

Another example of applying characterisation tests in this way concerns a group in Brazil [2], who started with scraps generated during the extrusion of SBR and EPDM profiles, and ground them under ambient conditions. The rubber crumb materials that were obtained had irregular-shaped particles with a high surface area and 

Other examples of the types of tests that are mentioned above have been covered in Chapter 5, Section 5.1.1, where they are used to characterise rubber crumb and other waste rubber products to assist in devulcanisation work. 

To assist in the marketing of tyre-derived rubber products, a categorisation system has been established as part of the UK Waste Resources Action Programme (WRAP) Quality Protocol (Section 6.4.1.5), which will help avoid possible confusion in the use of terms such as rubber crumb and rubber powder . The categories and definitions that are in the protocol are shown in Table 6.1. 

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One objective of this book is to describe the techniques used to devulcanise waste rubber so it (fin he reprocessed into high specification products. The production of rubber crumb from waste rubber products and its use to manufacture a wide range of products are also covered. 

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