Which Rubber is Fire Resistant

What Are the Fire Resistant Rubber? Neoprene, Viton, and silicone are all fire resistant rubber. Neoprene’s Fire Resistance Although Neoprene was designed for its various oil and chemical resistant properties, Neoprene can also withstand burning and high temperatures. Neoprene is rated for operating temperatures up to 200°F. When heated past 200°F, Neoprene may stiffen. Neoprene […]

Rubber Deterioration in an Air Oven – Test Method

Classification Systems are important for making good quality rubber products.  ASTM – Rubber Guidelines are necessary in ensuring that proper values are not only repeatable but accurate in an lab environment.  Coi Rubber also recommends other testings just as JIS, MILSPEC, and many other OEM guideline, however, a proper ASTM – Rubber Guildline must be […]

Rubber Property – Effects of Liquids – D471

This standard is issued under the fixed designation D 471; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision […]

ASTM – Rubber Guidelines

What is ASTM – Rubber Guidelines? The ASTM has over 12,000 standards.  Within those standards, we’ll focus mostly on the D-2000.  This is a classification system that covers the properties of vulcanized rubber materials (natural rubber, reclaimed rubber, and so much more.).  This not limited but are designed around the automotive standards.   What else does […]

Rubber Durometer of Rubber Hardness

In the rubber business, one of the most common terms you will encounter is rubber durometer.  Durometer is both a measure of hardness of the material and the instrument used to measure it. A rubber durometer can be used to measure the hardness of not only solid rubber but also cellular rubber (e.g. foams, sponges), plastics, […]

Hot Runner vs Cold Runner Molding Systems

What is the difference between hot runner vs cold runner systems? With the increasing cost of steel and raw materials, supply chain professionals are often looking for options to reduce part prices, cycle times, and material waste. Cold runner systems may be a cost saving solution compared to hot runner systems for the right application. […]

Rubber Product Design Guidelines

Introduction Rubber molding processes, such as extrusions, compression molding, or injection molding, take liquid raw rubber into a mold where the rubber is then cured into the mold shape by heat and pressure. As such, the mold cavity is cut to represent the desired geometry of the molded rubber product. Products such as o-rings, seals, […]

Tolerance Factors for Molded Rubber Products

What are the factors that affect the tolerances of molded rubber products? Many factors in the manufacturing process can affect the tolerances of the molded rubber product. In general, the consistency of dimensions will be contingent on the rubber material, mold tool, product design, and conditions of measurement. Shrinkage All rubber go through some degree […]

Ultra-High MW EPDM as a Replacement for NR

Natural Rubber (NR) is usually the material of choice in vibration and noise damping applications due to their excellence in strength and resilience. However, technological strides have been leading to ever smaller equipment and compartments, therefore decreasing the available airflow for components. This has led to rising temperatures under the hood, exposing the limited stability […]

Rubber Engineering: Resilience & Hysteresis

Definitions Resilience is the percent of energy required for a deformed pieces of rubber to rebound back to its original shape after a deformation. Hysteresis is the percent of energy loss per each deformation. Hysteresis results from friction happening inside the rubber which creates heat build-up. The heat build-up in the rubber is measured as […]

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