NR seals

What are NR seals?

NR is the abbreviation for natural rubber.

The raw material is extracted from the milky sap of rubber plants and is primarily important as a base material for other rubber compounds in the entire elastomer industry.

NR/SBR is a compound consisting of natural and styrene-butadiene rubber and is the most widely used rubber compound for a wide range of the simplest applications, thanks in part to the excellent mechanical and dynamic properties of this material.

We purchase part of the NR as rolls and sheets from the manufacturer Semperit. Here we divide the material qualities into three ranges that are suitable for different applications.

The NR/SBR qualities A9506, A618 and A621 are referred to as Commercial Standard quality. These are qualities that consist mainly of SBR components and only a very small proportion of NR. These qualities are suitable for simple applications and are in the lower price segment. A9506 can be supplied with one or two glass fibre inserts on request. This increases the tensile strength somewhat. The qualities A618 and A621 are tested PAH-free (BfR XXI category 1 and FDA 21 Food and Drugs Part 177.2600) and are suitable for use in the food sector.

A160, A560 and A654 are classified as para grades. They consist almost exclusively of NR and therefore have the best mechanical properties. The wear protection grade A590 contains slightly more SBR than the Para grades. This makes them less expensive, but they still have good mechanical values and excellent abrasion values.

In addition to Semperit NR/SBR, we also source various import qualities.

In addition to the named properties, the NR/SBR rubber has good compressive strength and good resistance to acetone and alcohol. Styrene-butadiene rubber is also considered to have excellent resistance to water and steam. Furthermore, the material is very ductile and shock-elastic. In addition, the temperature resistance is considered to be good. This makes this material suitable for many areas of application.

NR/SBR owns:

• High elasticity
• High cold flexibility
• High tensile strength
• High abrasion resistance

Only moderate resistance to numerous chemicals as well as alkalis and acids can be assumed. NR/SBR is also unsatisfactory in terms of its ageing resistance and resistance to ozone and UV light. The material is also not recommended with regard to fuels or cleaning agents containing solvents.

The material NBR is frequently used to produce rubber seals - especially flat seals - which are used in a wide variety of industries. The synthetic rubber is available to us in rolls and sheets. We will be happy to cut these to size for you.

Applications include seals for gas supply and oil production. In addition,flat gasketsmade from this material can be used for internal coatings on tanks and pipes to protect against corrosion. Thanks to nitrile rubber’s good resistance to oil and fuel, NBR seals are suitable for hydraulic and pneumatic applications.

It is also well-suited for use in mechanical engineering, in part due to its resistance to oil and fuel. The material’s advantages also make it suitable for use in engines, transmissions, and fuel systems. Finally, we are aware of the use of NBR seals in rollers for the printing, paper, and textile industries.

We will be happy to answer whether the elastomer is also suitable for your purposes. Please contact our customer service, who will be happy to provide you with comprehensive advice.