NBR (Nitrile) (acrylonitrile-butadiene rubber, typically 70 Shore A) is the default elastomer for oil and hydraulic sealing. Specified on ptfe thread seal tape it determines the corrosion behaviour (good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering) and the service temperature range (approx. -30 °C to +100 °C); the dimensions are ours rather than a standard's, and are listed in full below.
Why Choose NBR (Nitrile) for PTFE Thread Seal Tape
The default elastomer for oil and hydraulic sealing. For ptfe thread seal tape, this matters when good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering is the primary requirement.
Mechanical & Physical Properties
| Grade designation | acrylonitrile-butadiene rubber, typically 70 Shore A |
|---|---|
| Magnetic response | Non-magnetic |
| Service temperature | approx. -30 °C to +100 °C |
| Corrosion characteristic | Good resistance to mineral oil, grease and hydraulic fluid; poor in ozone and weathering |
Corrosion Behavior in Service
Carbon and alloy steel ptfe thread seal tape require a coating for corrosion protection. Zinc plating (with or without passivation) is the most common; hot-dip galvanizing is used for outdoor structural service; black-oxide is mainly a tarnish-prevention finish for tool-room use.
Galvanic & Galling Considerations
Galvanic and galling behavior do not apply to ptfe thread seal tape in NBR (Nitrile) — the relevant compatibility questions are chemical: confirm the elastomer against the fluid, the temperature and any cleaning agents in service, and check the gland or groove dimensions give the intended compression on the section.
Sizes of PTFE Thread Seal Tape Available in NBR (Nitrile)
| Colour | Density | Intended service | Notes |
|---|---|---|---|
| white | standard density | water and general plumbing | general purpose |
| pink | high density | water, larger threads | thicker, fewer wraps needed |
| yellow | high density | gas lines | gas-rated tape |
| green | oil-free, degreased | oxygen service | must be oxygen-clean |
| grey | with filler | stainless steel threads | reduces galling on stainless |
Dimensions are independent of the material: every size above is available in NBR (Nitrile).
Custom manufacturing · Made to drawing
Need this seal in a grade that is not listed?
Nbr is one of the grades the catalog describes. Inside diameter, cross-section and compound are the three that matter, and the compound is chosen against the fluid and the temperature rather than the dimensions.
Minimum order from 2,000 pieces; samples within 7 days of drawing approval.
