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Gummiwerk Kraiburg’s compounds are certified for use in gas supply as well as in gas devices and systems. (Source: Gummiwerk Kraiburg)

29. September 2020

Gummiwerk Kraiburg: Certified compounds for use in the gas industry

Approval from a competent institution is required for seals and membranes used in sensitive areas such as gas supply. Gummiwerk Kraiburg offers elastomer compounds for the gas industry which are certified according to the DIN (German Institute for Standardization) standards EN 549 and EN 682. The certifications confirm that the compound generations meet the requirements for use in gas supply as well as in gas devices and systems.

Primarily, two EN standards from the DVGW (German Technical and Scientific Association for Gas and Water) are applied to elastomers in the gas industry. EN 549 stipulates the requirements for the materials used to manufacture seals and membranes for gas devices and systems, such as gas meters. This standard prescribes tests of standardised samples which are made from sheets of the material. To confirm that the finished part is functionally suitable, finished parts can also be inspected once integrated in gas devices and systems. The materials are classified according to their temperature range and hardness. With certified NBR-based compounds, Gummiwerk Kraiburg serves the common temperature classes B1 and B2 and the important hardness ranges H2 and H3. Example: The classification of an elastomer material which can be used in temperatures ranging from -20 °C to 80 °C and where the nominal hardness is around 50 IRHD, is B2/H2.

Classification of a material by temperature classes according to EN 549

Class

A1

B1

C1

D1

E1

A2

B2

C2

D2

E2

Operating temperature in °C

from

0

0

0

0

0

-20

-20

-20

-20

-20

to

60

80

100

125

150

60

80

100

125

150

Classification of a material by hardness range classes according to EN 549

Class

H1

H2

H3

Nominal hardness range in IRHD

< 45

45 to 60

> 60 to 90

The second important standard for elastomers in the gas industry is DIN EN 682. This specifies the requirements of the materials used in seals for supply lines and components in operating temperatures ranging from –5 °C (in special cases –15 °C) to 50 °C. Here, a distinction is made between “general applications” (type G) and “special application” (type H). Type G is used for gaseous fuels as well as liquid hydrocarbons containing up to 30 vol% aromatic hydrocarbons, or liquid petroleum gas in its liquid phase. Type H is used for materials which convey gaseous fuels containing gas condensates, as well as for liquid synthetic hydrocarbons with an unlimited aromatic content.

Elastomer seals are designated according to EN 682 depending on their type, application and operating temperature. Gummiwerk Kraiburg’s NBR-based compounds, certified according to EN 682, are well assorted in the hardness range between 60 Shore and 93 Shore and available for the commonly required type GA – for the 70 Shore version, type GBL is also available. If suitable, this standard should be used in combination with the product standards which specify the performance requirements for seals. The operating temperature ranges do not determine the temperature of use of the respective materials. They merely define the certified and thus approved working temperatures for the respective use.

Designation of elastomer seals according to EN 682 depending on their type, application and operating temperature

Type

Application

Operating temperature in °C

GA

Gaseous fuels

-5 to 50

GAL

Gaseous fuels

-15 to 50

GB

Liquid hydrocarbons and gaseous fuels

-5 to 50

GBL

Liquid hydrocarbons and gaseous fuels

-15 to 50

H

Aromatic liquid hydrocarbons and gaseous fuels with gas condensates

-5 to 50

www.kraiburg-rubber-compounds.com

About the DVGW
The DVGW (Deutscher Verein des Gas- und Wasserfaches e. V.) is the federal association of the German gas and water industry. Its tasks include drawing up the Technical Rules which guarantee a safe and reliable supply of gas and water. Besides preparing the (national) DVGW rules, the institution is also involved in creating DIN, EN and ISO standards. Its other tasks include testing and certifying products in the gas industry.

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