Technical Notebooks
It is a challenging task for many of the thermoset EPDM rubber product manufacturers to meet the continuing increase in CUTR requirements and other more stringent design criteria for auto parts, such as under-the-hood coolant hose, wire and cable, and others
For the rubber industry, there currently are 346 ASTM International standards and 441 ISO standards in use globally. This paper will review the scope of these ASTM International and ISO standards used throughout the rubber world, briefly comparing them by categories such as rubber processing tests, chemical tests, physical tests of vulcanizates, specifications for compounding materials and a variety of product tests including automotive products, hose and latex, among others.
Rubber dandelion (Taraxacum kok-saghyz) produces natural rubber (cis-1,4,-polyisoprene), almost identical to rubber from the tropical rubber tree (Hevea brasiliensis), in root latex vessels (laticifers). Cost-effective field production is not yet possible because of low rubber content, slow growth rates, poor competition with weeds and short season when crops are established by economical direct seeding instead of expensive transplants.
The purpose of this study is to better understand the potential three routes (compound changes) to improve wet and dry traction of a model tire tread compound.
Precipitated silica use can improve the in-service performance of passenger car radial tires by increasing the wet traction, reducing rolling resistance, and maintaining tread wear life if dispersed to a similar degree as carbon black.
Elastomeric seals used in oil and gas production have to maintain sealing during the life of the wells, which can span 20-30 years. Long-term exposure of elastomeric seals to severe oil and gas downhole environment inevitably leads to degradation of elastomers.
The latest development of ultra-high molar mass EPDM rubbers enables the formulation of compounds with up to date unseen, superior mechanical and dynamic properties, especially at elevated temperatures.
Precipitated silica use improves the lab predictors of a passenger car radial tire tread compared to carbon black. Wet traction is improved by increasing the measured tangent delta at 0°C, and rolling resistance is improved by decreasing the measured tangent delta at 60°C.
Dry ice cleaning is non-abrasive, protecting the dimensions on parting lines and sealing surfaces of the mold. It is effective at keeping cavities and vents clean of mold release buildup, cured rubber residues and out-gassing.