Workhorse oil & fuel seal ringNBR O-Rings
Precision nitrile O-rings — the industry default for mineral oil, fuel and hydraulic sealing at a sensible cost.
- Temp
- -30°C to +120°C
- Pressure
- Up to 210 bar (with anti-extrusion back-up)
SERIES 05 / 0805 product lines
O-Rings
AS568 and metric O-rings in NBR, FKM, silicone, EPDM and PTFE-encapsulated grades for static and dynamic sealing across every fluid.
Precision elastomer rings, any mediumSERIES 05 / 08
Capabilities
Performance envelope
The O-ring is the most specified seal in industry — and the most often wrong when the elastomer doesn't match the fluid. SealGuard supplies precision-moulded rings in the full compound range, each with the correct hardness, temperature window and chemical resistance for the groove it sits in. From mineral oil and fuels in NBR to aggressive solvents in FKM and cryogenic-to-universal duty in PTFE-encapsulated cores, you get the right ring, traceable to AS568 or ISO 3601, the first time.
Operating LimitsO-Rings
- Temperatureθ · °C
- -60°C to +260°C
- PressureP · bar
- Up to 210 bar (with anti-extrusion back-up)
- Size RangeDN · ⌀
- AS568 -001 to -475 · metric BS 1806 / ISO 3601
- MaterialsMAT
- NBR, FKM (Viton®), silicone (VMQ), EPDM, PTFE/FEP-encapsulated
Product Range05 LINES
O-Rings lines
Browse the o-rings range, compare the headline limits, and add candidates straight to your quote request.
Workhorse oil & fuel seal ringHigh-temperature chemical seal ringViton® O-Rings
FKM (Viton®) O-rings combining high-temperature capability with broad chemical and fuel resistance for demanding static and dynamic duty.
- Temp
- -20°C to +200°C (+250°C peak)
- Pressure
- Up to 210 bar (with anti-extrusion back-up)
Wide-temperature hygienic seal ringSilicone O-Rings
Silicone (VMQ) O-rings spanning an exceptionally wide temperature range, ideal for hygienic, food-contact and dry-heat static sealing.
- Temp
- -60°C to +230°C
- Pressure
- Up to 40 bar (static, with back-up)
Water, steam & weather seal ringEPDM O-Rings
EPDM O-rings offering outstanding resistance to water, steam, weathering and polar fluids — but never petroleum oils.
- Temp
- -50°C to +150°C
- Pressure
- Up to 100 bar (with anti-extrusion back-up)
Universal-resistance elastic-core ringPTFE Encapsulated O-Rings
An elastic silicone or FKM core sheathed in seamless FEP or PFA, combining near-universal chemical resistance with O-ring springiness.
- Temp
- -60°C to +260°C
- Pressure
- Up to 80 bar (static)
Specification Guidance
Getting the spec right
Field-tested guidance from our engineers on specifying o-rings for demanding service.
- Note 01
Select the compound by fluid first, then confirm the temperature window — most O-ring failures are chemical, not mechanical.
- Note 02
Use 90 Shore A or anti-extrusion back-up rings as system pressure and extrusion gap rise.
- Note 03
Choose PTFE-encapsulated rings for mixed or aggressive chemistry where a single elastomer can't cover the duty.
- Note 04
Avoid EPDM in petroleum oils and silicone in dynamic or steam service — match the compound to the motion too.
Field Evidence
Proven where it matters
A reliability problem in the field, closed at the joint — and the numbers that followed.
Case StudyOil & Gas
Leak-tight sealing from -196°C through commissioning on an LNG train
01
Challenge
An LNG expansion needed flange and valve seals qualified for continuous cryogenic duty down to -196°C without relaxation or embrittlement, and the schedule left almost no float for material qualification.
02
Solution
We supplied spiral-wound gaskets with low-stress graphite filler alongside PTFE-encapsulated O-rings and skived graphite sheet for the cold-box joints, each backed by cryogenic test data and full material traceability. Engineering and logistics compressed delivery to hold the commissioning window.
03
Result
Every qualified joint passed helium leak testing at temperature on the first attempt. The train was commissioned on schedule and the cryogenic seals have held tight through thermal cycling since start-up.
- -196°C
- Qualified cryogenic service
- 1st-pass
- Helium leak test result
- 3 wks
- Concept to delivery
Let’s specify it
Engineer out your next leak.
Send us your service conditions — media, temperature, pressure and motion — and our engineers will specify the seal that holds the line.