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Elastomer products

Rubber and rubber-metal parts according to customer specifications

AS-KA offers a broad product range of elastomer products. Standard products are produced even for minimum quantities (production related) and are made with existing tools so they can be offered at low prices.

If our standard product range does not offer the specific rubber or metal-rubber product for your application, then we are happy to manufacture according to your specifications. Send us a technical drawing or a sample, we will immediately submit you a non-binding offer.

Our website only presents a selection of our total product range. We can advise you about other products, materials and applications by phone.

 


 Elastomer-/TPE- Productrange

 As-Ka product range with moulded hoses, rubber profiles, moulded rubber parts and rubber metal parts

 


Advantages of (TPE-) Elastomer products

  • Great tensile strength
  • Low abrasion values
  • Resistance to chemical influences
  • High pressure resistance (large selection of shore hardness)
  • High deformation resistance/flexibility
  • Temperature resistance
  • Long lifespan
  • Absorption of shocks
  • Reliable damping of vibrations
  • Best price/performance ratio
  • Own compound manufacturing
  • Own tool production

AS-KA – Your specialist for demanding elastomer solutions.

 


 

Material and production information

Natural rubber

Natural rubber is an elastic polymer and is derived from rubber trees in a rubber latex form. Natural rubber is mainly used for the production of (synthetic) rubber by vulcanization. AS-KA uses natural rubber for the production of rubber-metal parts, vibration dampers and anti-vibration elements.

The hardness of the natural rubber is measured according to DIN 53 505. The unity of the hardness is indicated in SHORE A (C and D).

Elastomers

Elastomers are relatively highly deformable plastics. Their form is solid, but reacts elastically to tensile and compressive stress. After their deformation, elastomers pull back into their original shape.
Elastomers are relatively highly deformable plastics. Their shape is fixed, but reacts elastically to tensile load and compressive stress. After their deformation, elastomers pull back into their original shape. There are two main groups of elastomers: chemically cross-linked elastomers (rubber materials) and thermoplastic elastomers. Due to its elastic property elastomers are particularly suited for the manufacture of seals. (Elastomers are often referred to as “rubber, but are actually a type of plastic)

Chemically cross-linked elastomers cannot be melted by vulcanization and decompose at high temperatures.

Thermoplastic elastomers are not chemically cross-linked in its macromolecular structure and can therefore be melted at high temperatures. Thermoplastic elastomers show the characteristics of elastomers in a wide temperature range.

Generally, elastomers and thermoplastic elastomers are indispensable due to their properties in the production of seals in the field of sealing technology.

Thermoplastics

Thermoplastics are high-polymer materials. They are fusible and much harder and stiffer than elastomers.
Expansion is irreversible for thermoplastics, they remain deformed. For this reason, the materials are also referred to as plastomers. Plastomers are mainly found in the application of sealing technology.

AS-KA uses PVC for the production of rubber profiles.

Thermoplastic Elastomers

TPE are structurally and behaviorally in-between plastics (thermoplastics) and rubber (elastomers). Thermoplastic elastomers, called TPE, are plastics which can be plastically deformed under heat to exhibit thermoplastic behavior. At room temperature, thermoplastic elastomers behave similar to conventional elastomers.

Mostly TPE contributes to product upgrading and provides advantages over elastomers. The TPEs include PVC, which is used at AS-KA for the production of molded rubber hoses and profiles. TPE, or TPO, stands for ThermoPlastic Elastomers based on Olefin, which is mainly PP/EPDM. TPE-V or TPV stands for cross-linked Thermoplastic elastomer olefins, predominantly PP/EPDM.

Vulcanization

Vulcanization is a chemical engineering principle in which natural and/or synthetic rubber is transferred to rubber-elastic polymers. Here, the raw rubber is combined with sulfur, or sulfur donating substances (e.g., sulfur monochloride) and heated. Because of the elevated temperature and additional pressure, the long chain molecules of the rubber are linked three dimensionally by sulfur bridges. This ensures that the plastic properties of the rubber are gone, allowing it to reach an elastic state. The degree of elasticity depends on the number of sulfur bridges formed during the reaction. The number of bridges behaves proportional to the amount of sulfur inserted and the duration of the vulcanization process. This is crucial, as the strength and hardness of the rubber material increases with the amount of sulfur bonds inserted.

Distinction is being made between hot and cold vulcanization. During the vulcanization, sulfur, either elemental or SC|², is used and the rubber-sulfur mixture is heated up to a temperature of 120-160° Celsius. During cold vulcanization S²Cl² is used at room temperature.

Rubber containing no double bonds (e.g. EPM) requires other methods. Peroxides, metal oxides, or energy radiation are the possible alternatives to sulfur bonds.

As a result of vulcanization, the rubber is much more resistant to mechanical stress as well as atmospheric and chemical influences. Over long periods, the sulfur bridges are replaced by oxygen bridges. Therefore rubber is porous in the aging process.

Almost all AS-KA elastomers can be vulcanized. We also offer angle-vulcanization with our rubber profiles.

Extrusion

Extrusion is a method for processing rubber mixtures. Granulate is inserted from above into a charging cylinder, where it is heated as well as plasticized and homogenized. The resulting mass is pressed out of the lower end of the cylinder with the use of pressing force. The continuous strand receives its shape via corresponding openings, after the production of the rubber strand the final vulcanization takes place. This method is mainly used for the production of profiles and hoses.

Compression-molding

The principle of compression-molding is used in the rubber molded parts manufacturing. A prepared still cold rubber blank, which is adapted to the end product´s weight and shape, is inserted into the opened part of a tool. Under high pressure and with the required heat for vulcanization, the upper part is pressed onto the blank. The rubber mixture flows into the cavity between the two parts of the tool, the so called nest, and thus receives its desired shape.

Injection molding

The injection molding process is an alternative to molding production. Here, the rubber material is plasticized and homogenized in warmed screw injection molding machines. The warm rubber compound is injected into the respective special tool by pressing. A solid form is achieved again by simple cooling of the material or a crosslinking reaction. Thus the cavity of the tool determines the final shape of the rubber molding. After this process, the product is already a finished product.

Differences between compression-molding and injection molding

The compression-molding process requires relatively long cycle times, because the rubber material must be heated by each tool individually before any operation can take place. It is also less accurate in the use of resources than the injection molding process, which demands a higher amount of rubber and might require a follow up of products. The injection molding process has a shorter cure time, caused by the already warm rubber. This does not only makes the corresponding cycle time shorter, but, because of the shorter thermal stress, may also implicate a better product quality. The final products of the injection molding process also have a higher dimensional accuracy, this mostly makes a follow up unnecessary.

ACM (acrylate rubber)

ACM has a high resistance to heavy oils and is characterized by good resistance to ozone, high temperatures and oxygen. This plays an important role, especially in the production of sealing parts for the automotive industry.

Temperature resistance: from -40 °C up to 180 °C

AEM (ethylene-acrylate VAMAC®)

AEM - Ethylene-acrylate rubber is a polymer of ethylene-methyl acrylate with carboxyl groups. It is a heat resistant version of ACM and has superior strength, although it has a lower resistance to mineral oils. AEM is suitable for demanding automotive applications such as turbocharger hoses and air guide elements. Therefore, it is particularly useful for the production of molded rubber hoses and O-rings. AEM is also known under the trade name ACM VAMAC® Fa. DuPont.

Temperature resistance: up to 180 °C, briefly up to 200 °C

CR (polychloroprene)

CR is a synthetic rubber which is used in automotive engineering. Polychloroprene is resistant to refrigerants such as ammonia and alcohol. It is usually used in conjunction with silicone oils and fats or at places where it comes in contact with salt water. It has a better ozone, weather and aging resistance than compared to NBR. Due to its good elastic behavior, it is particularly suitable for the production of special rubber molded parts and rubber molded hoses.

Cable sheathing, molded hoses, extruded profiles and seals based on chloroprene rubber match the automotive industry well due to the convenient possible combinations of properties.

The good abrasion resistance of polychloroprene rubber speaks for itself regarding its use for rubber profile making and molding production. Due to its self-extinguishing behavior, it is suitable in areas with fire hazard.

CR a low resistance to fuel and has adverse properties to solvent and steam. Im deutschen Sprachraum ist er auch unter dem Markennamen Neopren (Dupont) bekannt.

Temperature resistance: from -25 up to +100°C; Hot water is not recommended.

ECO (Epichlorhydrin)

ECO is mineral oil resistant and has a good resistance to weathering and ozone. Its good elasticity, flexibility at low temperatures and low compression set makes epichclorhydrin well suited for the manufacture of custom molded rubber parts, gaskets, membranes, formed hoses and roll covers. Additionally, it has a good resistance to alcohol and very little fuel and gas permeation.

ECO is used especially when good resistance to mineral oils, weather and ozone is required. ECO blends require relatively long curing times and are not resistant to aromatics.

Temperature resistance: from -35°C up to +130°C

EPDM (ethylene-propylene-diene rubber)

EPDM is a terpolymer elastomer (rubber) and thus a synthetic rubber. EPDM is a widely used material in the area of seal manufacturing. Even under strong UV and ozone pollution it is highly resistant to aging and therefore suitable for outdoor use (e.g. rubber profiles). It is very elastic and resistant to many alkalis and dilute acids and brake fluids on non-mineral-oil-containing base, as well as all polar media, therefore it is also recommended in CIP/SIP media. EPDM is resistant to hot water and steam and therefore essential for the production of hot water hoses. Because of this water resistance, EPDM counts as one of the most broadly used materials in the food and pharmaceutical industries. Additionally, this elastomer terpolymer is extremely abrasion resistant and has good tensile elongation and strength.

EPDM can be found in the rubber-sealing technology, the production of rubber profiles, the production of special profiles and in the production of molded hoses. EPDM is not persistent against petroleum products and some solvents and is poorly bondable with other components.

EPDM ist gegen Mineralölprodukte und bestimmte Lösungsmittel nicht beständig und ist schlecht verklebbar mit anderen Bauteilen.

Temperature resistance: from -40 up to +120°C

EPDM Sponge rubber

Rubber products made of sponge rubber are light, soft, elastic and resistant. They have an extremely high sealing capability and are easily formable. The ozone, weathering and UV resistance of EPDM sponge rubber is good to excellent; this goes as well for the resistance to acids, alkaline, ketone and alcohol. Just like normal EPDM, EPDM sponge rubber is suitable for the sealing technology and even perfect for the rubber profile production.

FKM (Fluorcarbon-Rubber: Viton®)

FKM has good resistance to mineral oils, greases, fuels, aliphatic and aromatic hydrocarbons, some fire-resistant hydraulic fluids and synthetic oils. Furthermore, FKM has a high chemical stability and low gas permeability. Due to this low gas permeability, FKM is suitable for high vacuum. Additionally, FKM has good resistance to HF- A, B and D fluids. (Water in oil emulsion, oil in water emulsion, water-free synthetic fluid)

Due to the good adhesion between rubber and metal, which is achieved thanks to dynamically cross-linked elastomers, FKM is used for the production of rubber-metal buffers, shock absorbers and rubber moldings.

FKM is preferred over NBR in the manufacture of molded rubber parts, which requires high operating temperatures or special chemical resistance.

Temperature resistance: from -30°C up to +200°C

HNBR (Hydrogenated NBR)

HNBR is a more advanced version of NBR which can be used in a broader spectrum of application areas.

HNBR has a high impact resistance and is flexible at low temperatures. HNBR differs in the resistance of high temperatures, namely about 150 °C during continuous operations and also has a higher abrasion resistance. In addition, it shows improved ozone resistance and weather resistance. In dairy plants EPDM-components are replaced by HNBR, because of the grease resistance. HNBR is suitable for the production of rubber-metal buffers and molded hoses. It is well suited for use in conjunction with hot water, refrigerant R 134A and steam.

HNBR is not suitable for electrical isolations, as it is not very cold resistant and flammable.

Für elektr. Isolierungen nicht geeignet, nicht sehr kältebeständig und brennbar.

Temperature resistance: from -30°C up to +150°C

MVQ (Silicone rubber)

MVQ is resistant to motor oils and gear oils of aliphatic nature as well as animal and vegetable oils and fats. It is resistant to fire, hydraulic fluids and high molecular weight chlorinated aromatic hydrocarbons, and it is also able to withstand water up to +100 ° C. It is resistant to ozone, aging and weather and has the best temperature flexibility and excellent dielectric properties. The difference between MVQ and VMQ is the following: MVQ is used according to DIN ISO and ASTM according to VMQ.

It is needed mostly in the production of specific moldings in food and medical applications. MVQ is not resistant to steam above +120 ° C, acids and alkalis, fuels and aromatic hydrocarbons. In addition, the mechanical properties of silicon are rather moderate.

Temperature resistance: from -55 ° C / -60 ° C up to +210 ° C (hot air)

NBR (Nitrile Butadiene-Rubber)

NBR has good mechanical strength properties and, depending on the material mixture, has a good heat resistance. NBR has good resistance to water glycols, hydraulic oils and oil-in-water emulsions, petroleum and petroleum products, animal and vegetable oils, gasoline and heating oil and is therefore very well suited for use in the sealing technology.

NBR is often used for the production of rubber profiles. Due to its high abrasion resistance, it is also ideal for rubber molding manufacturing.

NBR has a poor ozone and weather resistance and is combustible. Aromatic and chlorinated hydrocarbons, and polar solvents, may lead to swelling.

Temperature resistance: from -30 up to +100 ° C, hardened in hot air, oils up to +120 ° C, water up to +80 ° C, special blends remain flexible at low temperatures down to -55 ° C.

NR (Natural Rubber)

NR has a very high tensile strength, low temperature flexibility and elasticity, and excellent dynamic properties. In addition, natural rubber has great strength and resilience as well as high elongation and good abrasion resistance.

NR provides optimal conditions for rubber molded parts and often appear in the production of molded parts. In specific rubber profiles you find natural rubber in the manufacturing process as well. Generally e.g. Car tires, gaskets, hoses, diaphragms, sponges, shoe soles, rubber boots, gloves are made of natural rubber.

NR is not resistant to mineral oils and greases. Without addition of appropriate protection natural rubber has a low resistance to aging, heat and ozone.

Temperature resistance: from -40 up to +80 ° C

PVC (Polyvinyl chloride)

PVC is a stable material which is particularly resistant: it is weather resistant, chemical resistant, it will not corrode and it is flame retardant. In the sealing technology PVC frequently occurs in the profile production. AS-KA offers various profiles such as clamp profiles made of PVC.

Soft PVC hardens in gasoline and oil. It produces dioxins when burned.

Temperature resistance: from -10 up to +60 ° C

SBR (Styrene Butadiene Rubber)

SBR has a very good abrasion resistance and tensile strength, a good aging resistance and a good resistance to brake fluids. This combination of properties provides the best conditions for rubber seals and molded rubber hoses. Therefore, SBR is used both in the production of rubber profiles, rubber molded parts and rubber molded hoses.SBR has a very good abrasion resistance and tensile strength, a good aging resistance and a good resistance to brake fluids. This combination of properties provides the best conditions for rubber seals and molded rubber hoses. Therefore, SBR is used both in the production of rubber profiles, rubber molded parts and rubber molded hoses.

Temperature resistance: from -30 up to +80 ° C

 


 

Safety

The above shown information about our materials is merely indicative. This does not relieve the customer of any responsibility whilst dealing with the materials. Elastomers have a limited lifespan. Regular inspections are essential.

AS-KA rubber parts for industry, moulded rubber parts for automotive

 

Your AS-KA contact person:

Mr B. A. Kenan Colakoglu

Mr B. A. Kenan Colakoglu
Sales

Phone: +49 (0) 2151-99 39 37
k.colakoglu@as-ka.de

Languages: deutsch türkisch englisch spanisch

 

Mr B. A. Sinan Colakoglu

Mr B. A. Sinan Colakoglu
Sales

Phone: +49 (0) 2151-99 39 51
s.colakoglu@as-ka.de

Languages: deutsch türkisch englisch

 

Ms Tutku Kozan

Ms Tutku Günes
Sales

Phone: +49 (0) 2151-99 39 45
t.kozan@as-ka.de

Languages: deutsch türkisch englisch