TACKY (RUBBER SURFACE)
Sticky material that will adhere to itself, usually to ply up layers.
TENSILE STRENGTH
The amount of tensile stress that causes a specimen to rupture; measured in psi.
TEXTURIZATION
The process of embossing a texture on the surface of graphite foil to achieve better adhesion between layers of graphite foil, and prevent delamination of a die-formed graphite ring.
THERMAL BARRIER
A layer of insulating material designed to reduce the surface temperature at the gas sealing layer to a level compatible with its heat resistance capability.
THERMAL CONDUCTIVITY
A measure of the rate at which thermal energy is transferred through a substance. High thermal conductivity is an advantage in pump packing applications where it is important to transfer frictional heat away from the shaft/ packing interface so that the packing does not burn.
THERMAL CYCLING
The repeated heating and cooling of a tank, vessel or piping system. The duration of the cycle can vary tremendously.
THERMAL EXPANSION
The increase in volume or length of a material that occurs as a result of a temperature increase.
THERMAL MOVEMENTS
Movements created within a system caused by a thermal change. Can be axial, lateral, or torsional.
TINSEL
Fine slit widths of metallic foil. Die-formed rings are made from tinsel and used as junk rings, bushings, and in some cases even as bearings. Garlock manufactures rings made from copper tinsels.
TOLERANCE
The upper and lower limits between which a dimension must be held.
TORQUE
Informal Definition: A measure of "twisting force". In packing applications, one might be concerned with the torque applied to the gland stud nut, or the torque required to overcome friction between the packing and the valve stem.
TORSIONAL ROTATION
The twisting of one end of an expansion joint with respect to the other end about its longitudinal axis. Such movement being measured in degrees as is angular rotation.
TRIM
The removal of superflous parts from a molded product, usually removal of parting line flash or feed sprues.
TRIM CUT
Damage to the elastomeric portion of the seal during trimming.
TRIMMED LIP DIAMETER
The lip diameter in the free state (no spring) developed by knife trimming the molded portion of the sealing element to form the contact line.
TRIMMING ANGLE
The angle between the trimmed face of a seal lip and the seal axis.
TUBE
The inner ply of the expansion joint that is in direct contact with the system media.