General rubber goods

Resorcinol formaldehyde latex (RFL) cord dips have only a limited application within the general rubber goods industry and for adhesion to be achieved with synthetic fibres it is necessary to use the systems developed by Bayer and Degussa. These systems are based upon a combination of resorcinol, a formaldehyde donor and a hydrated silica filler (commonly called the RFK system). This system is incorporated as dry ingredients into the rubber compound and is activated by the application of heat. 

The Excel workbook in the ETRMA GES Template - general rubber goods (GRG) contains the following sheets ... 

Natural rubber is derived from latex obtained from the sap of rubber trees. Its use ranges from household articles to industrial products. Tire and tube industries are the largest consumers of rubber and the remaining are taken up by general rubber goods (GRG) sector. A number of research studies have been carried out in the recent past on fabrication and characterization of OPF-NR composites. 

Use of even-speed therefore tends to be somewhat polarised, with some (but not all) tyre companies favouring even-speed mixing, and some (but again not all) general rubber goods companies favouring conventional friction-ratio tangential mixers. 

Another illustration of the impact of these influences, such as increasing landfill taxes for general rubber goods products, is that more forms of waste rubber are being considered for recycling. One example of this is the recycling of post-industrial and postconsumer ethylene-propylene-diene monomer (EPDM) rubber membranes, which has received a great deal of attention in recent years as described in an article published in Rubber and Plastics News [5]. 

This section will review the different technologies that are currently available for the devulcanisation of waste rubber from waste tyres, or from products in the general rubber goods (GRG) sector. Devulcanisation, although important, is only one way of recycling waste rubber and the extensive range of other technologies that have been developed for this purpose are covered in later sections of this book e.g., crumb manufacture and the use of crumb in the production of a variety of different products are reviewed in Chapters 6 and 7. 

Waste rubber crumb from a number of diene rubbers such as SBR, butadiene rubber (BR) and polyisoprene has been compounded with cheap mineral fillers and additives, such as monoethanolamine, hy Ushmarin and co-workers [32] at Chuvash State University and used to manufacture general rubber goods such as car mats and sleeping policemen for railway lines. They found that the use of a two stage mixing process in an internal mixer produced materials with the best physical and mechanical properties. 

It is not surprising that these end-uses are dominated by the general rubber goods which includes parts for cars and other means of transport, for washing machines and other domestic equipment and a wide range of industrial mouldings. 

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