Celebrating 132 years of service to the world-wide rubber industry
many EPDM grades are still produced using conventional Ziegler-Natta catalysts, molecular catalysts for EPDM production have been adopted readily and have grown rapidly. Dow has introduced its Advanced Molecular Catalyst (AMC) technology as a new benchmark in the EPDM industry by enabling even higher process sustainability and catalyst efficiency
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HNBR is rated for continuous use at temperatures from125°C to 150°C, depending on several compounding factors, with the choice of cure system being one of the most critical. While a sulfur cure can provide flex fatigue and high tensile properties, it does not have high temperature stability. Peroxide cured HNBR is the only suitable cure system for long term, 150°C temperature resistance. Peroxide cured HNBR also provides high modulus and low compression set, making it an ideal material for sealing applications. HNBR is the sealing material of choice in many automotive and oil well applications where high mechanical strength is needed, in addition to high temperature and chemical resistance
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Liquid poly(butadiene) resins can be defined as oligomers with a degree of polymerization (Dp) of 100 and molecular weights below the critical molecular weight. These materials have rheology defined as viscous flow at temperatures of less than 60°C. In this regime, properties such as glass transition temperature and viscosity are determined by both microstructure and macrostructure. In applications such as adhesives, thermoplastic modification or tire compounding, liquid poly(butadienes) are often used as high value additives, imparting specific performance enhancement
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Polypropylene (PP) is one of the most widely used polyolefins owing to its low density, low cost, high softening temperature and easy processing. PP is used in the form of molded pieces, sheets, films and fibers in medical, cosmetic and electronic applications. In the automotive industry, it represents 9% of the market, and is used in dashboards, door panels, bumpers and grilles. PP based composites are increasingly becoming preferred materials in automotive applications, and in particular for both exterior and interior parts. In the automotive industry, PP based composites are generally used for the manufacture of bumpers.
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April Issue
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Patents from United States Patent Office Tire with tread of carbon black reinforced rubber composition containing specialized styrene/butadiene elastomerU.S. patent:
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In aerospace, demand has increased for actuator designs that meet and exceed more rigorous performance standards, while providing unprecedented safety and reliability. Some of these requirements, such as the fire and flammability resistance defined in ISO 2685 and RTCA DO-160, go beyond the use of standard hydraulic seal designs. These high temperature, challenging requirements significantly impact commercial aircraft engine safety, and often force the use of heavy, bulky, easily damaged and costly external fire shielding. As a result, Greene Tweed developed the Fireproof Hydraulic Seal (FPH Seal), which has been specifically engineered to meet this need and establish a shielding alternative.
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The world today uses 12,000 medical gloves per second. Prior to the UP publication, U.S. glove production had been satisfied by a number of medical device manufacturers, namely, Safeskin, Ansell, Aladan, Baxter, Smith & Nephew and Johnson & Johnson. In addition, glove imports in the U.S. prior to 1985 were 1 billion pieces. In 1996, imports exceeded 21 billion pieces.
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The disposal of scrap rubber has been a concern since its vulcanization with sulfur and heat was accidentally discovered by Charles Goodyear in 1839. In addition to the scrap generated in production, there is the question of discarded rubber goods that have outlived their usefulness for their original function. Traditionally, this waste had ended up in landfills, contributing to the growing problem of overcrowding. Scrap tires are a well-publicized category of scrap rubber, as each year automobiles produce 246 million waste tires in the United States alone.
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