'O' Ring Guide
'O' Ring Guide
'O' Ring Guide
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‘O’ <strong>Ring</strong> <strong>Guide</strong><br />
Quality production and inspection<br />
Our Materials Technology Centre houses<br />
one of Europe’s most advanced facilities<br />
for elastomer batch production. At its heart<br />
is a computer-controlled internal mixer<br />
that holds formulae for all our elastomeric<br />
compounds — well over 300 in total.<br />
Together with on-line rheometer testing,<br />
this gives us complete batch traceability,<br />
regardless of any release certificate<br />
requirements.<br />
The post-curing of silicone and<br />
fluorocarbon elastomers is also under<br />
microprocessor control for temperature<br />
and time. Each cure cycle is recorded and<br />
is traceable as a vital link in our quality<br />
chain.<br />
Every ‘O’ ring manufactured by James<br />
Walker is visually inspected by a<br />
dedicated human inspector, or an<br />
automated optical inspection system, to<br />
the appropriate grade requirements of<br />
BS ISO 3601-3. Each production<br />
batch of seals is further dimensionally<br />
verified using our highly accurate and<br />
reproducible optical inspection systems.<br />
These state-of-the-art optical systems are<br />
the Micro-Vu and fully-automated Basler<br />
Vario2, both of which offer sub-micron<br />
resolution with exceptional repeatability.<br />
Micro-Vu optical inspection system<br />
Basler Vario2 fully-automated inspection system<br />
Contents<br />
Page<br />
How to use this guide<br />
Selecting an ‘O’ ring 4<br />
Selecting a back-up ring 5<br />
Selecting a material 6<br />
How to order 7<br />
Materials & properties<br />
General materials 8<br />
High performance materials 9<br />
<strong>Guide</strong> to material use 10<br />
Service grades 10<br />
Rapid gas decompression 11<br />
FEP encapsulated ‘O’ rings 12<br />
Back-up rings 12<br />
James Walker ‘O’ rings<br />
Chart 50: inch & metric sizes 13-16<br />
‘O’ rings for pipe fittings 16<br />
Aerospace sizes to BS ISO 3601-1 17-20<br />
Chart 72: metric sizes 21-22<br />
Chart 17000: inch sizes 23<br />
Non-standard sizes 24<br />
Complementary products<br />
Coloured materials 25<br />
‘O’ ring cord 25<br />
Commercial quality ‘O’ rings 25<br />
‘O’ ring kits 26<br />
Special packaging & kits 26<br />
‘O’ ring lubricants 26<br />
General design notes 27-28<br />
Housing design 29-31<br />
General information 31<br />
Contact details 32<br />
To order or get further details, call your local contact shown on rear cover or listed at www.jameswalker.biz 3
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