scope:

This specification defines the requirements for toroidal sealing rings (O-rings) manufactured from materials which have been approved to DTD 5612 - "Vulcanized Fluorocarbon Rubber (Low Compression Set)"

They may be used in air, reciprocating mechanisms or for static purposes, particularly in contact with petroleum-based lubricants, hydraulic fluids and fuels, silicone and di-ester based liquids where temperatures up to 225°C are encountered. For static applications they may be suitable for use at temperatures down to -5O"C, but in applications subject to vibration or movement they may not be suitable below -20°C.

The sealing rings are not suitable for use with certain phosphate ester-based liquids.

NOTE: At ordinary temperatures and in the absence of hostile environments e.g. when properly stored, these rubbers deteriorate only very slowly. For most practical purposes the effect is insignificant and storage life of fluorocarbon rubber may be considered indefinite. However, the rate of deterioration increases markedly with increased temperature and the Service life of the rubber therefore depends upon the opera final temperature. Conversely, the maximum temperature at which the rubber may be used depends upon the useful life required.