Elastomer materials

(NBR) Acrylonitrile Butadiene Rubber

Main features:

• good mechanical strength properties
• very good oil resistance
• good  abrasion resistance
• low ageing and weathering resistance
• moderate compression set

Hardness range:

• 30 to 90 Shore A

Chemical resistance:

• good resistance to mineral oils and fuels, vegetable and animal oils, silicon oils, water, dilute acids and bases at room temperature
• insufficient resistance to solvents and flame-retardant hydraulic fluids

Temperature resistance:

• -30°C to +100°C (+120°C)

Additional references:

• the properties of NBR vulkanizates are mainly contingent upon the acrylic nitrile content (ACN) and show good mechanical properties.
• the resistance to oils and fuels improve with higher ACN content compounds, whereby the to the same extent the low-temperature flexability and compression set decrease.
• NBR-LT "low-temperature" feature a temperature resistance of -60°C to +80°C (+100°C) - Special materials upon request.

(HNBR) Hydrogenated Nitrile Butadiene Rubber

Main features:

• very good mechanical properties
• very good oil resistance
• very good abrasion resistance
• very good hot air resistance
• very good ozone and weathering resistance
• good low-temperature flexibility
• low compression set

Hardness range:

• 35 to 90 Shore A

Chemical resistance:

• good resistance to mineral oils, flame-retardant hydraulic fluids, hot water, steam, dilute acids and bases
• insufficient resistance to aromatic and polar solvents as well as concentrated acids and bases

Temperature resistance:

• -30°C to +150°C (+175°C)

Additional references:

the properties of HNBR vulcanizates are mainly contingent upon the acrylic nitrile content (ACN) and show good thermal and mechanical properties. 

• HNBR-LT "low-temperature" feature a temperature resistance of -50°C to +150°C - Special materials upon request.

(EPDM) Ethylene Propylene Diene Rubber

Main features:

• good elastic characteristics
• very good weathering resistance
• good ageing, cold and hot temperature resistance
• good chemical resistance
• low compression set
• good hot water and steam resistance

 Hardness range:

• 40 to 90 Shore A

Chemical resistance:

• good resistance to hot water and steam, glycol based brake fluids, many acids and bases, polar solvents
• insufficient resistance to mineral oils and solvents

Temperature resistance:

• -40°C to +130°C

Additional references:

Due to the good resistance and the many potable water approvals, EPDM is the preferably used elastomer in water applications. Peroxide crosslinking compounds are typically used for water applications. 

• EPDM-perox: temperature range: -50°C to +140°C (+160°C) - Special materials upon request.

(FKM) Fluoro Rubber

Main features:

• moderate tensile strength
• very good resistance to ozone, oxygen, ageing and weathering
• very good hot temperature and chemical resistance
• low gas permeability, good use for high vacuum applicaitons
• flame-retardant
• limited flexibility at low-temperatures
• low compression set resistance

Hardness range:

• 60 to 90 Shore A

Chemical resistance:

• good resistance to mineral, vegetable and animal oils, fuels, many acids, bases and solvents
• insufficient resistance to polar solvents, certain bases, superheated steam

Temperature resistance:

• -20°C to +200°C (+250°C)

Additional references:

Special materials:

• low temperature FKM-GLT: -40°C to +200°C (+220°C)
• low temperature FKM-LTFE: -50°C to +200°C

(FFKM) Perfluoro Rubber

Main features:

• very good resistance to the most chemicals, amines, ketones and esters
• limited low temperature resistance
• the basic costs of this material are quite high, therefore this elastomer is mainly used in applications where other materials fail. 

Hardness range:

• 60 to 90 Shore A

Chemical resistance:

• outstanding chemical resistance similar to that of PTFE materials
• limited resistance to very hot steam (special compounds on request for this purpose) 

Temperature resistance:

• -15°C to +260°C (+320°C)

(ACM) Acrylic Rubber

Main features:   

• good ozone and ageing resistance
• very good mineral oil and mineral oil base grease resistance
• good transmission oil resistance (with EP additive), ATF oils
• limited low-temperature flexibility

Hardness range:   

• 50 to 80 Shore A

Chemical resistance:   

• low chemical resistance
• good against aliphatic hydrocarbons

Temperature resistance:

• -20°C to +150°C (+165°C)

Additional references:

ACM is frequently used in the automotive segment.

(AEM) Ethylene Acrylic Rubber

Main features:   

• very good ozone and weathering resistance
• very good mineral oil and mineral oil based grease resistance
• good resistance in water and refrigerants

Hardness range:   

• 50 to 80 Shore A

Chemical resistance:   

• good chemical resistance in general
• good against aliphatic hydrocarbons

Temperature resistance:

• -30°C to +150°C (+175°C)

Additional references:

AEM is frequently used in the automotive segment.

(VMQ) Vinyl Methyl Rubber (Silicone)

Main features:    

• outstanding heat and hot air resistance, top low-temperature flexability
• very good ozone, ageing and weathering resistance, very good dielectric properties
• very good physiological properties, anti-adhesive surface properities
• good elastic behaviuor
• high gas permeability

Hardness range:  

• 30 to 80 Shore A

Chemical resistance:   

• good against synthetic and vegetable oils, glycols, flame-retardant hydraulic fluids, certain solvents, water up to +100°C
• poor resistance against mineral oils, solvents, acids, bases, steam and silicon oils

Temperature resistance:    

•  -60°C to +200°C

Additional references:

Silicon rubbers distinguish themselves through their high thermal resistance, good low-temperature flexibility, good electrical properties and very good resistance against oxygen and ozone.

Special material - FVMQ - Fluorosilicon:

Fluorosilicon rubber (FVMQ) has in addition to the typical properties of silicon (VMQ), a significant resistance against oils, fuels and solvents. This is particulary for aromatic and chlorinated hydrocarbons and alcohols. Due to the high temperature range of -60°C to +200°C and the excellent chemical resistance, also against aggressive media, FVMQ gives a numerous application options.

Temperature resistance of FVMQ:

• -60°C to +200°C

(CR) Chloroprene Rubber

Main features:   

• excellent ozone and weathering resistance
• good refrigerating agent, ammonia
• good low-temperarture flexibility

Hardness range:    

• 40 to 80 Shore A

Chemical resistance:   

• good silicon oil and silicon based grease resistance
• limited mineral oil resistance (free of aromatics)

Temperature resistance:    

• -35°C to +100°C 

Additionol references:

CR is used in particular with many types of refrigerating agents like frigene/freon. CR exhibits a very good ozone and weathering resistance.

(SBR) Styrene Butadiene Rubber

Main features:    

• has good mechanical properties i.e. abrasion resistance, low compression set, rebound, tensile strength and elongation.

Hardness range:    

• 30 to 90 Shore A

Chemical resistance:   

• very good alcohol and glycol resistance
• good silicon oil and silicon oil based grease resistance
• no resistance against fuels, benzene, mineral oils and mineral oil based grease

Temperature resistance:    

• -30°C to +70°C 

Additional references:

SBR is used in particular for the production of tires, conveyor belts, brake pads and clutch linings, due to its good mechanical properties.