Melt Flow
A measure of the molten material’s fluidity.
Melt Flow Rate
The quantity of thermoplastic material in grams that flows through an orifice during a 10-minute time span under conditions as specified by ASTMAmerican Society of Testing and Materials; technical organization formed for the development of standards on characteristics and performance of materials, products, systems and services, and the promotion of related knowledge. D 1238.
Melt Index
The melt flow of a thermoplastic material as determined under Condition E of ASTM D 1238. Condition C or high load melt index produces a higher melt flow for a given material as a result of the greater force applied to the sample during the test.
Melt Viscosity
The resistance of the molten material to flow.
Microtunnel Boring Machine (MTBM)
The microtunnel boring machine (MBTM) refers to the microtunnel shield jacked through the earth which excavates the ground in advance of the pipe being installed.