The DMYO-V oscillograph
Properties of elastomers can be measured and computed by the DMYO-V oscillograph.
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New, used and rebuilt machinery directories
The editors of Rubber World Magazine have compiled a classified list of rubber machinery and equipment with supplier companies is followed by directories of the companies that supply process machinery to the rubber industry, including both new and used/rebuilt equipment. Company listings include addresses and complete contact information.
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Patents for July
Patents as compiled by the editors of Rubber World Magazine for July 2022
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Nitrile latex for gloves
The federal government, particularly the Defense Logistics Agency, recently indicated that its objective is to support the annual U.S. production of 50 billion nitrile gloves to satisfy the most critical U.S. medical PPE requirement. This quantity, while seemingly significant, represents about 11% of the examination gloves produced globally, and 30% of the gloves used in the U.S.
There are more than a handful of glove companies intending to contribute to the satisfaction of this government objective. The polymer designated for the gloves will be acrylonitrile butadiene latex, or nitrile latex. To produce 50 billion gloves, it will take approximately 1.1 billion pounds of nitrile latex. The U.S. presently has limited capability to manufacture nitrile latex. Most of this latex would be manufactured in Korea, Malaysia, Italy and Brazil
Dow, Bridgestone develop silicone tire sealant
Bridgestone Americas and Dow have partnered to develop BSeals, a recyclable, silicone based tire sealant technology. The extended mobility solution was introduced at the 2022 Silicone Expo in Detroit, MI, in June, and represents more than four years of joint research and development between the two companies.
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Effects of steam sterilization and gamma irradiation on halogenated butyl rubber compounds
by Kevin Kulbaba, Dana Adkinson, Greg Davidson and Sarah Elliott, Arlanxeo Butyl rubber (IIR) is formed from the cationically initiated
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Surface modification of aluminum trihydroxide to enhance arc and acid resistance of silicone compounds
High temperature vulcanization (HTV) silicone rubber is the polymer of choice with regard to housing material for high voltage applications. The requirements are challenging due to harsh environmental conditions like UV irradiation, humidity, industrial pollution, etc. The tracking and erosion performance of the compound needs to be evaluated to ensure the long term performance of the high voltage insulator. Another key aspect to increase the durability of the insulator is the resistance against nitric acid, as this is formed by a combination of unavoidable corona discharges in overhead power lines and atmospheric humidity.
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Evaluation of crosslinking coagents in HCR silicone
CR silicone՚s unique properties allow it to be used in many niche ways. These unique properties include temperature stability, weatherability, compatibility and processing ease. Silicone has a very low starting durometer in its raw state. High levels of reinforcing filler are typically needed to obtain high durometer specifications. Additionally, physical properties of silicone are generally lower than most other elastomers. This can often cause difficulties in meeting tear, modulus, compression set or dynamic property application requirements. Application segments for silicone include automotive, wire and cable, architectural,
aerospace, consumer products and medical devices.
Design and process parameter definitions
ond interview (published in the April 2022 issue of Rubber World) detailed the development and characterization of polymers for polymeric development through computer modeling. This third interview discusses parameters needed to guide product development. Future interviews will discuss polymer product design, analysis and optimization using finite element analysis, and product manufacturing establishment, simulation and fine tuning in molding, extrusion and thermoforming of thermoplastics and thermosets, rubber and plastics
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