BS 6997:1990

What is BS 6997 – NBR O-ring specification about?  

'O'-rings are vital components in plumbing, firefighting, or gas and fuel pumps/pipes to prevent the leakage of gas or liquid.

BS 6997 is a British Standard that specifies requirements for the composition and physical properties of toroidal sealing rings (“O”-rings) manufactured from acrylonitrile-butadiene rubbers complying with BS 6996.

The five hardness grades of acrylonitrile-butadiene rubbers used are B0 50, B0 60, B0 70, B0 80 and B0 90 of BS 6996.

Who is BS 6997 - NBR O-ring specification for? 

BS 5106 on ‘NBR O-ring specification’ is useful for: 

• Manufacturers and suppliers of O-rings
• Product design engineers / innovation teams
• Quality control / testing personnel
• Compliance / audit teams

BS 5106 on ‘NBR O-ring specification’ is also useful for sectors that use O-rings in their pumps and pipes: 

• The petrochemical sector
• Firefighting sector management authorities
• Water and sewage management authorities
• Builders / real estate developers / architects
• Civil project authorities and project managers

Why should you use BS 6997 - NBR O-ring specification?  

An 'O'-ring is used to either prevent two elements from coming apart or to prevent anything passing between them.

BS 6997 guides you with aspects such as dimensions, surface imperfections, and materials for NBR O-rings. In addition, BS 6997 discusses packaging and storage as well as marking of the NBR O-rings.

BS 6997 guidelines help you to follow best practices when manufacturing NBR O-rings to mitigate risks to life and property around gases and liquids. BS 6997 is a step towards ensuring that employees can safely work around high-pressure gases and liquids.