PTFE

Is the most chemically inert of the O-ring materials, it is a tough polymer possessing an incredible working temperature range.


Trade Name(s):

Teflon®

DuPont Performance Elastomers

TFM

Dyneon

ASTM D1418 Designation

FEP

Standard Colour

White

Description

PTFE is the most chemically inert of the O-ring materials, it is a tough polymer possessing an incredible working temperature range.

Key Uses(S):

Seals for wide chemical exposure situations, with special emphasis on temperature extremes. Its outstanding tear resistance and abrasive resistance result in its slippery surface properties that make it advantageous for use in seals in moving systems such as mass spectrometer probes and valves.

Temperature Range:

Standard Compound: -185° (-300°F) to 232°C (450°F)

Hardness (Shore D):

54 TO 57

Features

PTFE is resistant to most chemicals including acids, bases, oils, steam and other chemicals. It is also very tough and abrasive resistant, even at elevated temperatures. Seals fabricated from this material feature outstanding weather resistance, high resistance to ozone, and high resistance to the degrading effects of exposure to such solvents as acetone, MEK, and xylene. Possessing average elastomer characteristics of 2,500 to 3,500 psi tensile strength, and 300% elongation, they are tough, impact resistant, low friction, non-twisting performers over an extremely wide temperature range.

Limitations

PTFE is hampered by very poor elastic memory at room, or low temperatures. This presents problems in O-ring installation, and requires extra care to be taken in control over O-ring I.D.

Because of its poor tear resistance, during O-ring installation particular care should be taken to avoid nicking or scratching Teflon®, as imperfections will cause O-ring leakage. However the material is not easily compressed, and therefore may not seal as easily as some of the other polymers. Finally, the tendency of virgin Teflon® to cold flow over time, when used in gasket type applications, may require special material compounding (with fillers) to control such “creep” in critical sealing situations.

Please note: This Material Data Sheet section is to be used as a professional guide only. Eastern Seals (UK) Ltd may source their products from a variety of Quality Approved Suppliers and the data shown should not be relied upon by any purchaser without verification of material source.

 

ES REF
Colour
Temp Range
Shore
Notes
Data Sheet
PTFE BLACK -100⁰C to +250⁰C A Conductive PTFE compound 1% by weight composition of Carbon Black. 99% free flowing granular PTFE, for auto Isostatic and general purpose compression moulding. Material meets the FDA regulation under code 21CFR 177.1550 and Euro Directive 10/2011/EC for material that may come into contact with food.
PTFE FDA (mouldings) WHITE -250⁰C to +250⁰C This Virgin PTFE is a high bulk agglomerated grade designed for general, automatic and Isostatic moulding. It is particularly suitable for producing large mouldings from relatively compact tools. Material meets the FDA regulation under code 21CFR 177.1550 and Euro Directive 10/2011/EC for material that may come into contact with food.
PTFE FDA / WRAS (rods) BLACK -250⁰C to +250⁰C A Virgin PTFE produced in tube or rod form which conforms to the requirements of BS EN ISO 13000-1: Grade 2. Material meets the FDA regulation under code 21CFR 177.1550 and Euro
Directive 10/2011/EC for material that may come into contact with food, and Water Regulations Advisory Scheme to BS6920.
PTFE FDA / WRAS WHITE -250⁰C to +250⁰C A Virgin PTFE free flow granular resin used in a multi-purpose role with an excellent combination of handleability, processability, machinability and end use properties. Meets the FDA regulation under code 21CFR 177.1550 and EU Directive 10/2011/EC for material that may come into contact with food. Also meets WRAS Approval. Conforms to the requirements of BS EN ISO 13000-1 Grade 1 Type P (as processed) or Type S (Stabilised) and to ASTM D 4894 type IV grade 2. High and low working temperature and low friction.

REQUEST A CALLBACK

If you have any queries, or would like any more information,
don’t hesitate to get in touch



Online store

We are the largest supplier of British Standard, Metric series O-rings and sealing solutions.

Visit Store Now

Search

Search
Generic filters
Exact matches only
Filter by Custom Post Type