How To Identify The Type Of Rubber?

Identification of rubber type:
Rubber can be divided into natural rubber and synthetic rubber according to its preparation and source; Rubber can be divided into general type and special type according to use. First, introduce natural rubber and synthetic rubber:
1. Natural rubber (NR)
The raw material of natural rubber comes from rubber plant trees. The utility model has the advantages of good elasticity, high strength, good insulation, small deformation and convenient processing. Its disadvantages are: no oil resistance, poor temperature resistance, easy aging, and all are mixed. Generally, we produce automobile tires and some rubber parts with shock absorption and wear resistance.
2. Synthetic gum
Synthetic rubber includes: SBR, NBR, BR, EPDM, IIR, CR, ACM, HNBR, CSM, FKM, MVQ, etc.
2.1 EPDM
Advantages: excellent aging resistance, weather resistance, good electrical insulation, good impact elasticity and oil resistance.
Disadvantages: slow curing speed, poor self-adhesive property, poor hot tearing property, and poor processing property.
Uses: To manufacture heat-resistant conveyor belts, steam hoses, chemical resistant seals, shock pads, waterproof materials, and leather cups and rings for automobiles.
2.2 Nitrile butadiene rubber (NBR)
Advantages: excellent oil resistance, good heat resistance, aging resistance, wear resistance, corrosion resistance, etc.
Disadvantages: poor cold resistance, acid resistance, electrical insulation and tear resistance.
Usage: Mainly used for making oil seals, shaft seals, gaskets (O-rings) and other products, as well as oil resistant rubber hoses, conveyor belts, rubber cots, vacuum rubber hoses, shock absorption products and textile accessories.
2.3 Styrene butadiene rubber (SBR)
Advantages: good heat resistance, aging resistance and wear resistance.
Disadvantages: poor cold resistance, elasticity, bending resistance, chap resistance, tear resistance, poor processing performance, small plasticity change, large calendering deformation, poor self-adhesiveness.
Usage: mainly used for pneumatic tyres, and secondly for rubber shoes, rubber hoses, adhesive tapes, rubber rolls, adhesive tapes and model products, as well as vacuum cleaner seals, such as suction seals.
2.4 Neoprene (CR)
Advantages: good bending resistance, heat resistance, aging resistance, acid and alkali resistance, good elasticity and good air tightness. It has cold resistance and water resistance.
Disadvantages: poor storage stability, easy crystallization, and poor electrical insulation.
Usage: mainly used to produce rubber parts in household appliances and air conditioners.
2.5 Butadiene rubber or polybutadiene rubber (BR)
Advantages: good elasticity, low temperature resistance and wear resistance.
Disadvantages: low tensile strength and tear strength, poor wet skid resistance and poor viscosity.
Usage: Mainly used for making tires, but also for making wear-resistant products (such as rubber shoes, rubber rollers), cold resistant products and shock resistant products.
2.6 IIR
Advantages: It is characterized by good air tightness, weather aging resistance, light aging resistance, chemical resistance, high temperature resistance and cold resistance, and long-term working temperature can be below 130 ℃; The effect of absorbing shock or vibration is better, and the electrical insulation is better.
Disadvantages: elasticity is not as good as natural rubber, curing speed is slow, processing performance and viscosity are poor.
Application: It is most suitable for pneumatic inner tube, followed by underground cable, high-voltage cable, radiation proof gloves, lining of chemical equipment and shockproof rubber products.
2.7 Acrylic acid mastic (ACM)
Advantages: It has good heat resistance and oil resistance, and is stable in lubricating oil containing sulfur, phosphorus and chlorine additives. At the same time, it has good aging resistance, oxygen resistance, ozone resistance, ultraviolet resistance and air tightness. Operating temperature range: about - 25~+150 ℃.
Disadvantages: poor cold resistance, no water resistance, no resistance to steam, organic and inorganic acids and alkalis. In methanol, ethylene glycol, ketone ester and other water-soluble solutions, the expansion is serious. At the same time, the elasticity and wear resistance are poor, the electrical insulation is poor, and the processing performance is poor.
Application: It can be used to manufacture oil resistant, heat resistant and aging resistant products, such as seals, rubber hoses, chemical linings, etc.
2.8 Hydrogenated nitrile rubber (HNBR)
Advantages: high mechanical strength and wear resistance, heat resistance is better than NBR when cross-linked with peroxide, and other properties are the same as NBR. Operating temperature range: about - 30~+150 ℃.
Disadvantages: The price is high.
Application: mainly used in oil and high temperature resistant sealing products.
2.9 Chlorosulfonated polyethylene (CSM)
Advantages: excellent ozone resistance and aging resistance, weather resistance is superior to other rubbers. Flame retardancy, heat resistance, solvent resistance, resistance to most chemicals and acid and alkali resistance are good. The electrical insulation is acceptable, and the abrasion resistance is similar to that of styrene butadiene rubber. Operating temperature range: about - 20~+120 ℃.
Disadvantages: poor tear resistance and processing performance.
Usage: wire and cable sheath, rubber hose, adhesive tape, rubber roller chemical lining.
2.10 Fluoroelastomer (FKM)
Features: good abrasion resistance, good weather aging resistance, light aging resistance, ozone aging resistance, radiation resistance, good gasoline, benzene, toluene, alcohol, weak acid resistance, service temperature range: about - 20~+200 ℃, special grade - 35~+250 ℃ (can work at 250 ℃ for a long time).
Disadvantages: This glue is expensive.
Application: It is mainly used to produce rubber products that are resistant to vacuum, high temperature (such as aircraft and rocket), chemical corrosion, oil and high temperature.
2.11 Silicone rubber (MVQ)
Advantages: It can withstand both high temperature (up to 300 ℃) and low temperature (down to - 100 ℃). It is the best cold and high temperature resistant rubber at present; At the same time, it has excellent electrical insulation, high stability to thermal oxidation and ozone, and great chemical inertness.
Disadvantages: low mechanical strength, poor oil resistance, solvent resistance and acid and alkali resistance, difficult to vulcanize, and expensive.
Application: It is used to make high and low temperature resistant products (rubber hose, sealing element, etc.), high temperature resistant wire and cable insulation layer. Because it is non-toxic and tasteless, it is also used in food and medical industry.
2.12 Isoprene rubber (IR)
With its stable chemical properties, it is widely used in the tire manufacturing industry. It has good elasticity, cold resistance (vitrification temperature - 68 ℃) and high tensile strength. Under the conditions of oxidation resistance and multiple deformation resistance, the notch tear resistance is higher than that of natural rubber, but the processing properties such as mixing and calendering are slightly worse than that of natural rubber.
3. Rubber mix
The raw rubber is added with vulcanizing agent, accelerator, active agent, reinforcing agent, filler, softener, antioxidant, anti cross agent and other additives, which are uniformly mixed in the rubber mixing machine