Piece of material that seals two parts together. Prevents air or fluids from
leaking between the parts.
Glass transition temperature
The glass transition temperature (Tg) is the temperature point where a polymer experiences
a significant change in properties. The polymer structure turns "rubbery" upon
heating and "glassy" upon cooling; a large change in
Young's Modulus is experienced. Amorphous polymers are structural below
Tg and go through one stage of the change from a glassy to a rubbery consistency
with a simultaneous loss in stiffness. Crystalline, materials go through a stage
of becoming leathery before becoming rubbery.
Originally: adhesive based on egg white. Adhesive made from protein derived
from the collagen in animal products such as hides and bones. Word now used
indiscriminately to mean an adhesive, mainly in connection with woodworking.
Includes adhesives on an animal, plant or synthetic base. Syn.
Time between application and solidification of the adhesive. During the green
time, it is still possible to position parts.
Fixuring time is often somewhat longer than green time.
Syn. Open time