Rubber compounds. SILICONE COMPOUNdS.

Custom engineered solutions for your applications

Rubber is used virtually everywhere. There is hardly a material that has contributed as much to the progress of technology and modern industrialization as rubber. It has also led to revolutionary developments in many other fields and has become a standard feature of everyday life.

Today, rubber is an indispensable product with widespread applications, and this will not change in the foreseeable future. That is why KRAIBURG is highly committed to the continuous development of new rubber materials.

Based on following polymeres we develop compounds to meet the diverse requirements of a broad range of applications:

Natural rubber 


  • Operating temperature range in air: -55 °C / +70 °C
  • Hardness 25 Shore A – 70 Shore D
  • Very good dynamic properties
  • High strength, elasticity, rebound resilience
  • Good resistance to water, alcohols, glycols, diluted weak acids and alkaline solutions

Areas of application

For example, conveyor belts, flexible couplings, motor bearings, bridge bearings, O-rings, seals and buffers

Styrene-butadiene rubber


  • Operating temperature range in air: -45 °C / +90 °C
  • Hardness 20 Shore A – 70 Shore D
  • Physical properties similar to natural rubber, resistance to ageing and heat
  • Very good abrasion resistance
  • Chemical resistance similar to that of natural rubber

Areas of application

The major area of application is the tyre industry; also for shoe soles, cable sleeves, seals, hoses, roller coatings, conveyor belts, floor coverings

Ethylene-propylene-diene rubber


  • Operating temperature range in air: -50 °C / +130 °C
  • Hardness 20 Shore A – 95 Shore A
  • Excellent resistance to ozone, ageing and weather
  • Low compression set is possible even at high temperatures
  • Very good resistance to hot water, steam, acids, alkaline solutions and hydraulic fluids with a glycol-water basis

Areas of application

Examples are seals for windows and doors, hoses for washing machines, dishwashers and water fittings, cable insulations and cable sheathings, use in drinking water, use in seal and control applications.

Butyl rubber


  • Operating temperature range in air: -60 °C / +130 °C
  • Hardness 30 Shore A – 80 Shore A
  • Very low gas permeability
  • Good resistance to ozone, ageing and weather
  • Good resistance to hot water, acids, alkaline solutions and polar solvents

Areas of application

Used in air hoses, inner liners of tyres, pharmaceutical stoppers and pipettes, membranes, rubber-coated fabrics, vapour and chemical hoses, safety gloves, etc.

Chloroprene rubber


  • Operating temperature range in air: -40 °C / +100 °C
  • Hardness 20Shore A – 90 Shore A
  • High flame resistance
  • Good resistance to ozone, ageing and weather
  • Good resistance to paraffinic mineral oils and greases, refrigerants such as ammonia, etc.
  • Good mechanical properties and good elastic behaviour also at low temperatures

Areas of application

For example, conveyor belts, seals, hoses, air springs, roller coatings, wiper blades, linings, cable sheathings and rubber-coated fabrics.

Chlorosulfonated polyethylene


  • Operating temperature range in air: -30 °C / +120 °C
  • Hardness 45 Shore A – 95 Shore
  • Very good resistance to ozone, ageing and weather
  • Good to very good resistance to oxidising chemicals, organic and inorganic acids and bases
  • Good flame resistance

Areas of application

For example, cable sheathings, linings, seals, membranes, floor coverings, roofing felts, rubber-coated fabrics

Chlorinated polyethylene


  • Operating temperature range in air: -30 °C / +130 °C
  • Hardness 60 Shore – 95 Shore A
  • Good resistance to ozone, ageing and weather
  • Good colour stability
  • Average oil resistance and flame resistance, similar to CR

Area of application

For example, for the manufacture of flame-resistant and oil-resistant cable sheathings, also for hoses.

Epichlorhydrin rubber


  • Operating temperature range in air: -45 °C / +130 °C
  • Hardness 40 Shore A – 90 Shore A
  • Excellent ozone resistance
  • Very low gas permeability
  • Good resistance to mineral oils/greases and aliphatic hydrocarbons

Areas of application

Seals, membranes, hoses and roller coatings. Used primarily in applications requiring good resistance to mineral oils and heat in combination with low gas permeability or good low temperature flexibility.

Nitrile rubber


  • Operating temperature range in air: -30 °C / +110 °C
  • Hardness 20 Shore A – 75 Shore D
  • Very good abrasion resistance
  • High strength (depending on filler), similar to natural rubber
  • Good resistance to oils and fuels

Areas of application

For example, oil- and fuel-resistant seals, membranes, hoses, conveyor belts, rubber-metal bonds, plastic-to-rubber bonded parts and friction linings

Hydrogenated nitrile butadiene rubber


  • Operating temperature range in air: -30 °C / +150 °C
  • Hardness 50 Shore – 95 Shore A
  • Resistance to mineral oils, fuels and oxidising media
  • Very good resistance to ozone, ageing and weather (especially fully hydrated types)
  • High tear resistance
  • Very good abrasive properties

Areas of application

For example, numerous dynamic and static products that are subjected to dynamic and abrasive loads with exposure to heat and media, hoses and belts, industrial seals for oil field exploration and processing, as well as rolls for steel and paper factories.

Polyurethane rubbers


  • Operating temperature range in air: -40 °C / +120 °C
  • Hardness 55 Shore A – 95 Shore A
  • High tear resistance, good wear behaviour and abrasion resistance
  • Good resistance to mineral oils and greases
  • Good resistance to ozone, ageing and weather

Areas of application

For example, seals, scrapers, gear teeth and other wear-resistant technical components, solid tyres and rolls, roller coatings, high-quality athletic shoe soles, etc.

Polyacrylate rubber


  • Operating temperature range in air: -40 °C / +150 °C
  • Hardness 50 Shore – 90 Shore A
  • High resistance in mineral oils, additives and lubricants
  • Very good resistance to ozone, ageing and weather
  • Good compression set

Areas of application

Is used primarily in automotive and motor construction for cylinder head and oil pan seals, oil hoses, and turbocharger hoses.

Ethylene-acrylate rubbers


  • Operating temperature range in air: -40 °C / +150 °C
  • Hardness 50 Shore A – 90 Shore A
  • Very good resistance to oil
  • Can easily be made flame retardant
  • Good damping properties
  • Very good resistance to ozone, ageing and weather

Area of application

Compounds are used primarily for the manufacture of oil-resistant compounds and cable insulations. These compounds are also used for damping elements (buffers, absorbers) and flame-proof cables (halogen-free, no caustic combustion products).

Vinyl acetate rubber


  • Operating temperature range in air: -40 °C / +160 °C
  • Hardness 60 Shore A – 90 Shore A
  • High heat resistance
  • Good resistance to water, glycerine, ethylene glycol
  • Very good resistance to ozone, ageing and weather

Areas of application

EVM is used for the manufacture of flame-resistant, heat-resistant and weather-resistant products. Typical applications are cable sheathings, hoses, floor coverings, rubber-coated fabrics, seals and profiles for automotive and building construction.



  • Operating temperature range in air: -30 °C / +220 °C
  • Hardness 50 Shore A – 90 Shore A
  • Very good temperature resistance
  • High chemical resistance (minerals, oils, greases and non-polar media)
  • Excellent resistance to ozone, ageing and weather
  • High gas tightness

Areas of application

For example, seals (shaft ring seals, O-rings, tube applications), petroleum industry: down-hole, hydraulic applications, rollers, fuel lines, coatings and compensators for flue gas scrubbers.

Silicone rubber


  • Operating temperature range in air: -50 °C / +220 °C
  • Hardness 20 Shore A – 90 Shore A
  • High resistance to ozone, ageing and weather
  • High heat resistance
  • Resistant to, for example, aliphatic engine and gear oils, HFD-R and HFD-S flame-retardant hydraulic fluids and glycol-based brake fluid

 Area of application

Food contact: for example valves in food production, coffee maker seals, transport hoses

Dynamic applications: absorbers, diaphragm etc.

Special applications: aircraft door and window seals, as well as rollers



  • Operating temperature range in air: -65 °C / +200 °C
  • Hardness 40 Shore A – 80 Shore A
  • Very good thermal stability
  • Very good low temperature flexibility
  • Excellent resistance to ozone, ageing and weather
  • Good resistance to oils and hydraulic fluids

Areas of application

Special seals for the automotive and aeronautics industry with fuel contact, which require excellent low temperature properties.



  • Operating temperature range in air: -5 °C / +320 °C
  • Hardness 75 Shore A – 85 Shore A
  • High stability against aggressive media and in polar/non-polar media
  • Reliable in static and dynamic applications

Areas of application

Ideal for demanding seal applications, whenever the customer needs high-quality parts such as O-rings. The unique properties of this material help to maintain seals, which can result in less maintenance, reduced operating costs and improved safety. Only seal elements made of perfluor-elastomer achieve the virtually universal chemical resistance of PTFE, without having to miss the typical sealing, resilience (compression set) and creep resistance of rubber.

You have not found the ‘right’ product yet?

Do you have specific questions about our mixtures or do you need advice and assistance?

Send us a short message via the inquiry form or by e-mail, we will be happy to take care of your request.

Or just give us a call +49 8638 61 – 0.

Our product.

KRAIBURG continually tries to set new standards in technology, quality, manufacturing, delivery performance, customer relations and service. Our highly customized and cost-effective solutions far exceed the current standards. As a leading worldwide manufacturer of state-of-the-art rubber and silicone compounds, we have continually innovated and evolved our range of products.

From concept to creation, we support our customers by providing an unbeatable combination of experience and expertise. Our sales force provides customers with the breadth of knowledge related to our products to help them make informed decisions. KRAIBURG applications engineers have significant expertise in specific product solutions, and our product engineers provide detailed technical product knowledge.

Each of these roles play an integral part in helping customers achieve their goals.

We have more than 10,000 sq. m. of facilities with the following capacities:

  • 5 mixer lines (3 for black / 2 for colored compounds)
  • Strained and extrusion technology
  • Fully integrated production process
  • Colored and bright compounds
  • Strainer and extrusion technology
  • Roller head technology

Our sectors.

As a creative and innovative partner we offer our customers top-quality products and processes as well as excellent service for their lasting success. Our company has always lived a culture that includes close and trustful cooperation with our customers and partners.

With its innovative compounding solutions, KRAIBURG is the leading specialist for the development and manufacture of rubber and silicone compounds that fulfill the most stringent requirements.
The proximity to the customer, the know-how of our specialists and our high level of material competence are firmly established aspects of our broad portfolio.

Food Industries
Chemical Industries
Composite System KRAIBON®




‘Stable and high-quality function – compliant with specifications’

As an experienced, reliable partner of the overall supply chain, we produce tailor-made solutions for the automotive industry in close collaboration with our customers.

Applications of our compounds are specification-compliant, integral and indispensable parts in system components and make an essential contribution to their stable and high-quality function.

KRAIBURG compounds are used in the following application areas:

  • Under the hood
  • Interior
  • Exterior
  • Motor chassis / Chassis / Drive unit


The food industry is a diverse and challenging environment. The variety of products and the use of numerous flavors can have different effects on elastomer components. For example, acids, alkalis or alcohols can affect material properties. Mechanical stress from frequent product changes and cleaning cycles is also a challenge. To meet these demanding requirements and ensure food safety, we offer a portfolio of elastomer compounds specifically developed for the food sector.

Our well-assorted portfolio for the food industry: Elastomer compounds for high demands

In Germany, products based on natural and synthetic rubber that come into contact with food must comply with Recommendation XXI of the German Federal Institute for Risk Assessment (BfR). This recommendation has recently been revised, particularly with regard to the risk assessment of process-related impurities. The updated Recommendation XXI is aligned with European standards.
Gummiwerk KRAIBURG has met these demanding requirements by carefully evaluating and assessing its production processes in close cooperation with an accredited testing institute.

The compounding specialist introduces a streamlined and well-assorted compound portfolio based on NR, NBR and EPDM, covering a hardness range from 35 Shore A to 85 Shore A, in response to the revised regulations. This diversified portfolio is suitable for a wide range of applications and includes both black and colored compounds.

Confirmation that the formulations comply with the underlying positive lists is the basis for successfully passing the required finished part tests in accordance with this recommendation.

Applications in which Gummiwerk KRAIBURG compounds are used:

  • Seals in lines
  • Seals for dispensing plants for the beverage industry
  • Diaphragms
  • Valves for the food industry
  • Rubber teats/calf teats for the dairy industry
  • Rubber materials and articles used in food production
  • Drive rollers for conveyor belts

Fit for Food

Compound portfolio for the Food Industry


“High-performance materials with high durability”

Reconciling regulatory requirements with higher productivity is never a simple matter. Applications in chemical processing require high-performance materials with important characteristics, such as resistance to various aggressive chemicals, as well as extremely high and low temperatures. The mechanical strength also plays an important role.

Applications in which KRAIBURG compounds are used:

  • Seal elements in chemical reactors
  • Pumps in waste management plants
  • Sensor casings in analytical and industrial measuring technology
  • Metering elements in the chemical industry


KRAIBON® is a thin film made of non-crosslinked natural rubber which hardens together with resin in the existing manufacturing process.

The result is a composite material that combines the best elements of fibre composite materials and elastomers. The direct integration of elastomers into the fibre reinforced plastic (FRP) layers makes it possible to create an alternating structure of hard and soft material that combines the good mechanical properties of FRP with the good “elastic” properties of the elastomer. The main areas of application are optimisation of acoustics, and impact and splintering protection.

The key advantage is the direct integration of elastomers. The ordinary production process of an FRP component remains the same – no additional bonding agents are necessary. This innovative technology is purposefully used in sectors like the automotive and sport industries, aerospace, rail vehicles and even in orthopaedics.

More details are available here.


With our sector-specific and application-oriented experience, we have comprehensive expertise in the development of compounds for surfaces.

We produce rollers for the mechanical engineering sector, the steel and metal industry, foil production and refinement, the printing industry, the plastics industry, the paper industry, and many others.

Roller coatings for printing/coating of materials

  • Flexo printing sleeves
  • Intaglio printing pressure rollers
  • Adhesive application rollers
  • Paint rollers
  • Roller coatings for textile production
  • Squeeze rolls in chemical baths
  • Roller coatings with special surface properties
  • Embossing rolls
  • Feed rolls


To ensure safety and quality in industrial and chemical process environments, manufacturers around the world rely on our extensive experience with solutions for the water and gas industry.

KRAIBURG Pure – elastomer compounds for drinking water

The quality of drinking water is subject to high legal requirements. Operators of water treatment plants are responsible for ensuring the supply security of the population and for complying with the legal framework. Changing quality of the raw water and the protection of water resources from contamination constantly present new challenges for the operators.

We offer an innovative and efficient solution for the drinking water market. This is how the compound series – KRAIBURG Pure – was created at the end of 2018, which can also be used in elastomer applications for drinking water after 2021.


Gas industry – compound generation in compliance with DVGW standards

For elastomers in the gas sector, two EN standards of the DVGW (German Technical and Scientific Association for Gas and Water) are essentially applied. EN 549 specifies the requirements for materials from which seals and diaphragms for gas appliances and systems – such as gas meters – are made. This standard prescribes tests on standardized test specimens which are made from plates of the material. In order to confirm the functional suitability of the finished part, the finished parts installed in gas appliances and systems can also be tested.

With its NBR-based compounds certified according to the standard, Gummiwerk KRAIBURG serves the common temperature classes B1 and B2 as well as the significant hardness ranges H2 and H3. We also provide a corresponding certificate according to the DIN EN 549 standard for the hardness range of 70 Shore A, which is of great importance for use in gas appliances.

The EN 682 certified and also NBR-based compounds from Gummiwerk KRAIBURG are well sorted in the hardness range between 60 Shore and 93 Shore and available for the frequently required type GA – for the 70 Shore variant also the type GBL. More information

We offer elastomer compounds based on NBR for the gas sector, which are certified according to the DIN standards EN 549 and EN 682. The certifications confirm that the compound generations meet the requirements for use in gas supply systems and in gas appliances and equipment.

Our solutions are used in the following products:

  • Components / seals in gas supply lines (EN 682) (NBR)
  • Seals / membranes (EN 549) in gas devices and systems (NBR)
  • Seals, wedges, shut-off valves in the drinking water supply (cod water, sulphur-crosslinked EPDM)
  • Components in drinking water fittings (cold and hot water, perox. EPDM)

KRAIBURG Pure - Certified Compounds. For the future.

You can find more information here or simply contact our specialists.


Highest quality, reliability and energy-efficiency are three key requirements that products must fulfil for use in railway traffic. In the process, the durability of the materials, which are often exposed to temperature fluctuations, is extremely important.

GUMMIWERK KRAIBURG has developed system solutions and materials that are designed especially for these conditions. Consequently, maintenance costs can be reduced over the entire life cycle.

KRAIBURG has a proven track record as a reliable partner of the railway sector.

Our Solutions are used in the following products:

  • VMQ compounds (in accordance with UNI CEI 1170-3, UNI CEI EN 45 545, BS 6853) for internal and external components of the carriage
  • VMQ compounds (in accordance with EN 50382-2, NFF63-827) rail vehicle cable for high temperatures
  • Elastomer fireproofing compound certified in accordance with EN45545 R1HL3
  • Underfloor protective impact panel in a rail vehicle produced in elastomer fibre composite honeycomb panel


Wind energy is the world’s most thoroughly developed alternative energy sources. Its growth is promoted by rising oil prices, greater environmental awareness and increasing energy requirement.

The efficient use of the natural force of wind through innovative technologies and systems is therefore an exciting challenge for manufacturers and service/maintenance companies.

For this purpose, we offer our customers specially developed compounds for products such as seals. In addition, we have developed a new system solution for erosion protection of rotor blades.


The mechanical engineering sector is a global and very dynamic market. Conforming to the requirements of OEMS and suppliers and developing a product and service offering that makes the customer more competitive is our goal. Not only is efficiency emphasised, the quality and performance of the machine are also a central focus.

Gummiwerk KRAIBURG compounds are used both in standard applications and also in advanced components that are subjected to high service temperatures and / or aggressive media.

Our Solutions are used in the following products:

  • Cladding for pipelines
  • Pneumatic and mechanical pinch valves
  • Hydraulic seals
  • Valves in automation technology
  • EPDM and FKM-based compensating elements


Extraction and processing of oil and gas are elaborate and require specific technologies. Wide-ranging and highly complex systems must function efficiently and reliably under extreme environmental conditions. Components such as seals, O-rings and tailor-made rubber components must be protected against heat, cold, humidity, temperature fluctuations, corrosion and UV radiation, depending on the installation location.

We support you with application-specific compounds with which process safety is the central focus. This includes particularly robust solutions which have been approved in accordance with all common standards for demanding applications.

KRAIBURG compounds are used in the upstream, midstream and downstream sectors of the global oil and gas Industry.

Our Solutions are used in the following products:

  • FKM and FFKM compounds for O-ring and V-ring fittings, drills, stators, heat exchangers and oil seals
  • Components in the upstream sector (oil/gas extraction), midstream (transport) and downstream (oil and gas refinement)
  • Power sections (NBR, HNBR)
  • Blow-out preventer (annular elements, seals) (NBR, HNBR)
  • Rubberised pipes (NBR, HNBR, EPDM, FKM)
  • Pump pistons