The following material properties are for reference only, and the operating temperature and its characteristics may vary depending on the material design and formulation conditions.

NR

Natural rubber

NR refers to rubber materials obtained from natural plants. When you take out the liquid containing rubber latex from the rubber tree and dry it, it becomes raw. Latex makes an incision in the bark and harvests through a process called tapping.

NR is widely used in many applications and products, either alone or in combination with other materials. It has good elongation, elasticity and water resistance. However, NR rubber is vulnerable to vulcanization and is sensitive to ozone cracking. In addition, it has great elasticity at room temperature, but when it is below 10 ℃, it slowly crystallizes and hardens.


* Maximum operating temperature 60 ° C
* Minimum operating temperature -40 ° C
* GOOD : Tear strength, flexural crack resistance, elasticity
* BAD : Ozone resistance, weather resistance, heat resistance, oil resistance, chemical resistance

EPDM

Ethylene propylene diene methylene rubber

EPDM is a type of synthetic rubber that can be used for various purposes. This is an M-Class rubber and the 'M' of the M-Class represents the rating of ASTM standard D-1418.

EPDM is much more resistant to heat, light and ozone than natural rubber, unsaturated rubber such as SBR or CR. EPDM can be designed to withstand temperatures up to 150 ° C and can be used without degradation from the outside for decades. In addition, it has excellent low-temperature characteristics and can maintain its elasticity even at temperatures as low as -40 ° C depending on the grades and blending. EPDM is an electrical insulator with excellent resistance to heat, ozone, steam and weather.

It is a synthetic rubber which has a smaller specific gravity than other synthetic rubbers and which is capable of high filling of filler and oil, and is very economical.


* Maximum operating temperature 140 ° C
* Minimum operating temperature -40 ° C
* GOOD: Ozone Resistance, Acid Resistance, Alkali Resistance, Weather Resistance
* BAD: Oil resistance, chemical resistance

SBR

Styrene butadiene rubber

SBR refers to synthetic rubber derived from styrene and butadiene. It has similar physical and chemical properties to NR but has better abrasion resistance and aging resistance.

It also has good elasticity and dynamic properties and low heat generation.
Approximately 50% of car tires are made from various types of SBR.
SBR is used for coated paper, waterproofing agent for cement, damping rubber for shoes and speaker.


* Maximum operating temperature 90 ° C
* Minimum operating temperature -35 ° C
* GOOD: Aging resistance, abrasion resistance, elasticity
* BAD: Ozone resistance, weather resistance, oil resistance, chemical resistance

NBR

Nitrile butadiene rubber

Buna-N and NBR rubber, also known as acrylonitrile butadiene rubber, is a synthetic rubber of acrylonitrile (ACN) and butadiene.

It is a representative rubber of oil resistance, and wear resistance is good at the same time.
It is used in the automobile and aviation industries to manufacture parts requiring oil resistance such as fuel and oil hoses, seals, and grommets.
Also, it is used in various applications such as disposable gloves, automobile drive belt, o-ring, gasket, oil seal, synthetic leather, and wire cable.


* Maximum operating temperature 120 ° C
* Minimum operating temperature -25 ° C
* GOOD: Oil resistance, abrasion resistance
* BAD: Ozone resistance, weather resistance

HNBR

Hydrogenated nitrile butadiene rubber ( HNBR / HSN )

Hydrogenated nitrile rubber (HNBR) is a kind of synthetic polymer obtained by saturating a hydrogen chain of nitrile rubber with hydrogen.

HNBR has extremely good heat, ozone, chemical resistance and mechanical properties than standard nitrile rubber.
But the price is very expensive compared to NBR.

HNBR is widely used in the automotive and petroleum industries, and is usually used in the middle area between NBR and FPM.


* Maximum operating temperature 150 ° C
* Minimum operating temperature -40 ° C
* GOOD: Ozone resistance, aging resistance, oil resistance, abrasion resistance
* BAD: acid resistance, ketone, ester

CR

Chloroprene rubber

CR is a polymer of 2-chlorobutadiene and unlike ordinary rubber, it has weatherability, chemical resistance and flame retardancy. In addition, it has a low gas permeability and a strong point of adhesion (when it is made of rubber adhesive). The price is considerably higher than general rubber such as SBR EPDM.

It is mainly used for diaphragm and boots because of its flexibility. DuPont's Neoprene brand name is used as synonymous with CR.


* Maximum operating temperature 100 ° C
* Minimum operating temperature -30 ° C
* GOOD: weather resistance, ozone resistance, flex resistance, flame retardancy
* BAD: mineral oil resistance

IIR

Isobutylene isoprene rubber ( Butyl )

It is called Butyl rubber and similar to EPDM, it has good ozone, aging resistance, weatherability and electrical properties.

The properties of butyl rubber are low water permeability and high vibration absorption. The permeability of various gases is extremely small and the permeability of air is 1/10 of that of natural rubber.
It is widely used for automobile tubes, wire covers.


* Maximum operating temperature 120 ° C
* Minimum operating temperature -40 ° C
* GOOD: weatherability, ozone resistance, acid resistance, alkali resistance
* BAD: oil resistance

AR

Acrylic rubber ( ACM / ANM )

A generic term for polymers containing acrylic acid alkyl esters.

It is divided into spherical and new type. The spherical type is ACM (copolymer of acrylic acid alkyl ester and acrylonitrile) containing chlorine and ANM.
Also referred to as polyacrylate rubber, abbreviated AR.
Acrylic (AR) rubber has mechanical strength and rubber elasticity significantly lower than NBR, but it is used mainly for automotive transmission seals because it has oil resistance, oxidation resistance and heat resistance are superior to NBR.

ACM has no double bonds in the molecular structure and is not easily degraded by oxygen. However, hydrolysis is caused by heat and moisture, and cold resistance is not so good. In addition, processing is difficult and expensive. Although it is used as an oil seal, it is not suitable as a hydraulic motion seal due to lack of strength and lack of rubber elasticity.


* Maximum operating temperature 160 ° C
* Minimum operating temperature -10 ° C
* GOOD: Ozone resistance, oil resistance, heat resistance
* BAD: Water resistance, low temperature flexibility, chemical resistance

FKM

Fluorocarbon rubber ( FKM / FPM / VITON )

FKM (fluorocarbon rubber) is a family of fluoroelastomer materials as defined in ASTM International standard D1418. It is the same as FPM according to ISO / DIN 1629 standard.
FKM is more known as VITON rubber, a product name of fluorine rubber developed by DuPont.

Fluorine rubber is one of the most heat-resistant materials among rubber materials, and has excellent oil resistance and chemical resistance.
However, the price is expensive, the cold resistance is slightly lower, and there are vulnerabilities to ammonia. Also, the elongation and elasticity are relatively insufficient.

It is widely used for fuel systems such as aircraft, missile, and rocket, packing of hydraulic system, and gasket material.


* Maximum operating temperature 200 ° C
* Minimum operating temperature -25 ° C
* GOOD: weather resistance, ozone resistance, heat resistance, chemical resistance, oil resistance
* BAD: Alkaline, ketone

SI

Silicone rubber ( SI / Q / MQ / VMQ )

Silicone rubber has a stable chemical structure that is incomparable to any other type of elastomeric material.
It is a non-corrosive and non-oxidizing compound with various properties such as heat resistance, cold resistance, electrical insulation, chemical safety, gloss and abundant elasticity .

IIn addition, the permeability of gas and heat is high, and the permeability of air is about 100 times of polyethylene and 10 to 20 times of synthetic rubber.
It is a state-of-the-art material that can impart physical and electrical properties (super insulation, super heat resistance, super flame retardation, etc.) freely by means of chemical synthesis, reaction and compoing technology.
However, there is a drawback that the tear strength is weak and the wear resistance is poor.

Silicone rubber has the highest temperature range available among rubber materials. It is also applicable to food processing facilities and appliances approved by the FDA, the US Food and Drug Administration.
It is widely used for fuel systems such as aircraft, missile, and rocket, packing of hydraulic system, and gasket material.


* Maximum operating temperature 250 ° C
* Minimum operating temperature -95 ° C
* GOOD: weather resistance, ozone resistance, heat resistance, cold resistance, chemical resistance, elasticity, insulation, flame retardancy, non-toxicity
* BAD: Oil resistance, tear strength, abrasion resistance, compression set permanent compression

PU

Polyurethane rubber ( PU / AU / EU )

Polyurethane rubber that can be processed is divided into two types.
One is polyester urethane (AU) and the other is polyether urethane (EU).
The AU type urethane has extremely good oil resistance, flame retardancy and solvent resistance, but is eroded by water.
EU type urethanes are not eroded by water and have good flame resistance and oil resistance compared to nitrile rubber or HNBR.

Urethanes are commonly used in the mechanical industry. Particularly, it is used for relatively high abrasion resistance and relatively high strength materials.


* Maximum operating temperature 80 ° C
* Minimum operating temperature -40 ° C
* GOOD: weather resistance, abrasion resistance, flexural resistance, tear strength
* BAD: Chemical resistance, heat resistance, elasticity

CSM

Chlorosulfonated polyethylene rubber ( Hypalon )

Hypalon(하Hypalon (Hypalon) is a registered trademark of chlorosulfonated polyethylene synthetic rubber.
It has excellent weatherability, ozone resistance, chemical resistance, flame retardancy and heat resistance.
In addition, the color remains unchanged and bright even when exposed to the outside for long periods.
Depending on the formulation, excellent mechanical properties, high tensile strength and abrasion resistance can be obtained.


* Maximum operating temperature 130 ° C
* Minimum operating temperature -25 ° C
* GOOD: weather resistance, abrasion resistance, flame retardancy, ozone resistance, chemical resistance, discoloration resistance
* BAD: Compression set, low temperature oil, heat aging

BR

Polybutadiene Rubber

Polybutadiene rubber (BR) is a polymer prepared by solution polymerization of 1,3-butadiene. It has three forms of cis-1,4, trans-1,4, viny1 structure.
Based on the content of cis-1,4, it is classified into High cis BR (HBR) and Low cis BR (LBR).

BR is transparent, has low heat generation, excellent abrasion resistance, rebound resilience and good dynamic properties.
It is also the most universal rubber with natural rubber, SBR and is used in tires, belts, hoses, shoes, golf balls and so on.


* Maximum operating temperature 90 ° C
* Minimum operating temperature -45 ° C
* GOOD: abrasion resistance, rebound resilience, high transparency
* BAD: oil resistance, ozone resistance