جدیدترین بلاگ ها

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14 Nov 2022
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Carboxylated Nitrile ( XNBR )

XNBR Carboxylated Nitrile ( XNBR ) Cabboxylated Nitrile is similar to Nitrile rubber, but the polymer backbone has been chemically modified with Carboxylic Acid containing group. This result is XNBR with more excellent abrasion and tear resistance than traditional NBR. For this reason, XNBR based parts are usually applied in dynamic assembly such as seals and rod wipers. Cure system - Sulfur - Cured Standard XNBR compounds are sulfur-cured Performs Well In… ►Aliphatic hydrocarbon ►Vegetable and mineral oils and greases ►Diesel ►Water Dilute acids, alkali and salt solutions Doesn't Perform Well ...

نوشته شده توسط admin_ghaemi
14 Nov 2022
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Silicone Rubber ( MQ, VMQ, PVMQ )

VMQ Silicone Rubber ( MQ, VMQ, PVMQ ) Physically, silicones are based on silicon, an element derived from quartz. To create this class of synthetic elastomers, pendant organic groups such as methyl, phenyl and vinyl are attached to silicon atoms. The different addition of side chains can achieve significant variations in properties. Silicones have excellent heat, ozone and corona resistance, very well dielectric stability, and resistance to many oils, chemicals, and solvents. And for all elastomers, silicones possess the best flexible property ...

نوشته شده توسط admin_ghaemi
14 Nov 2022
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Thermoplastic Polyurethane ( TPU )

TPU Thermoplastic Polyurethane ( TPU ) Thermoplastic polyurethane (TPU) is an elastomer that is fully thermoplastic. Like all thermoplastic elastomers, TPU is elastic and melt-processable. Further, it can be processed on extrusion as well as injection, blow and compression molding equipment. Thermopalstic polyurethane ( TPU ) is a unique category of plastic created when a polyaddition reaction occurs between a diisocyanate and one or more diols that results in high resilience, good compression set, plus resistance to impacts, abrasions, tears, weather, and ...

نوشته شده توسط admin_ghaemi
14 Nov 2022
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Styrene – Butadiene Rubber ( SBR )

SBR Styrene - Butadiene Rubber ( SBR ) The most widely used synthetic rubber in the world is SBR, a copolymer of styrene and butadiene. SBR was also was called Buna® S ( from the first trade name of Bayer ). Where SBR rubber is used the most is in tire by blending it with natural rubber and butadiene rubber. SBR is weak and unusable without reinforcement by carbon black, but with carbon black it is strong and abrasion resistant. The defects ...

نوشته شده توسط admin_ghaemi
14 Nov 2022
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Polyurethane ( PU, AU, EU )

PU, AU, EU Polyurethane ( PU, AU, EU ) The millable Polyurethane rubbers are distinguished into two types; one is polyester urethane (AU), the other is polyether urethane ( EU ). AU type urethanes have outstanding oil, fuel and solvent resistance but can be attacked by hydrolysis, EU type urethanes are not attacked by hydrolysis and still offer a fuel and oil resistance comparable to low ACN ( 18~22% ACN ) Nitriles or HNBRs. Any type polyurethane has excellent wear resistance, high ...

نوشته شده توسط admin_ghaemi
14 Nov 2022
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Natural Rubber ( NR )

NR Natural Rubber ( NR ) Natural rubber is produced from the latex of the Hevea brasiliensis, and the chemical name of this polymer is polyisoprene. Polyisoprene also can be synthesized by polymerization from its monomer isoprene. Natural rubber possesses many excellent physical properties including high resilience and strength and good abrasion resistance. The defects are like SBR, having poor resistance to hydrocarbon oil and not suitable in UV, oxygen,ozone because of the double bond in the polymer backbone. But its poor ...

نوشته شده توسط admin_ghaemi
14 Nov 2022
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Liquid Silicone Rubber ( LSR )

LSR Liquid Silicone Rubber ( LSR ) Liquid Silicone Rubber ( LSRs ) are low viscosity and high purity elastomers with two-part catalyzed silicone specifically designed for liquid injection molding. Each elastomer is supplied in a twopart kit (Part A and Part B),equal portions ( by weight ) of which must be thoroughly blended together prior to use. When blended and cured as indicated, the resulting elastomer consists of cross-linked dimethyl and methyl - vinyl siloxane copolymers and reinforcing silica. Cure system - ...

نوشته شده توسط admin_ghaemi
13 Nov 2022
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Nitrile Rubber ( NBR )

NBR Nitrile Rubber ( NBR ) Nitrile rubber, also known as NBR or Buna ® N, is one of the most commonly used sealing elastomers due to its resistance to petroleum based fuels and lubricants and its relatively low price. Nitrile elastomers are copolymers of acrylonitrile and butadiene.There are a number of common variations of nitrile compounds. Acrylonitrile Content The acrylonitrile ( CAN ) content of the polymer chains can be varied from 18% to 50%. Lower ACN content gives better low temperature properties ...

نوشته شده توسط admin_ghaemi
13 Nov 2022
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Butyl Rubber ( IIR )

IIR Butyl Rubber ( IIR ) Butyl rubber is composed by copolymerizing isobutylene which is with small amount of isoprene. It is like EPDM possessing excellent resistance to chemical and polar fluid, outstanding electrical insulation and good ozone resistance. The special properties of butyl rubber are low gas and moisture permeability and high shock absorption. These properties have made butyl rubber the polymer choice in a variety of applications. Cure system – Peroxide - Cured Standard IIRs are sulfur-cured. Other Common Variations: IIRs can be formulated ...

نوشته شده توسط admin_ghaemi
13 Nov 2022
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Hydrogenated Nitrile Rubber ( HNBR )

HNBR Hydrogenated Nitrile Rubber ( HNBR ) Hydrogenated Nitrile ( HNBR ) is a synthetic polymer that is obtained by saturating the double bonds in butadiene segments with hydrogen, and it is also called HSN ( Highly Saturated Nitrile ). This special hydrogenation process reduces lots of double bonds in main chains of NBR polymer, thus HNBR possesses superior heat, ozone, chemical resistance and mechanical characteristics over standard Nitrile. Acrylonitrile Content Same as NBR, there are different levels of Acrylonitrile ( CAN ) contentin ...