| 摘要 |
<p>Unburnt polytetrafluoroethylene tape for sealing screw joints which is produced by monoaxially stretching an unburnt molding of a composition comprising 75-25 parts by weight of fine polytetrafluoroethylene powder and 25-75 parts by weight of an inorganic powder having a Mohs hardness of 3 or less and being substantially non-water-absorbing. This tape has excellent heat resistance and sealing performance comparable to those of conventional polytetrafluoroethylene tapes for sealing screw joints and is reduced in the amount of polytetrafluoroethylene to be used. The use of the specified inorganic powder enables restrictions against the stretching conditions to be loosened and prevents screws from undergoing wear or damages otherwise caused by inorganic powders.</p> |
