Installation Guide

Pressure Rating The estimated maximum pressure

a liquid can exert continuously inside the pipe at which

the pipe will not fail.

Primer Solvent used to soften joint surfaces prior to the

application of solvent cement. It is usually tinted purple.

Solvent Cement A mixture of solvents (chemicals) and

plastic resins used to weld plastic pipe and fittings.

Solvent Cementing Using a solvent cement to make

a pipe joint.

Standard Dimension Ratio (SDR) Pipe A type of

pipe in which the dimension ratios are constant for any

given class. Unlike “Schedule” pipe, the pressure rating

remains constant for any specific class of SDR pipe,

regardless of the pipe diameter.

Stress Crack An external or internal crack in a plastic

caused by tensile stresses less than its short-time mechanical

strength.

Thermal Expansion The increase in a length of a plastic

part due to a change in temperature.

Thermoplastics A group of plastics which can repeatedly

be softened by heating and hardened by cooling.

Thermosetting Plastics A group of plastics which,

having been cured by heat, chemicals, or other means,

are substantially infusable and insoluble. They are

permanently hardened.

Weld Line (Knit Line) A term used to describe a mark

on a molded plastic part formed by the union of two or more

streams of plastic flowing together.

Glossary