The chemical treatment on a hose jacket to resist organic growth that would deteriorate the hose jacket fibers.

A conventional relative measure of fineness as applied to yarns. Coarse yarns have low numbers and fine yarns have high numbers.

The maximum “operating pressure” of a component or system. Identified as “WP” on Forest Service-qualified fire hose. Also known as “rated pressure".

The pH content of a hose jacket determined after boiling in distilled water in a laboratory test.

The amount of deviation from a straight line when the hose is hydrostatically tested; usually expressed in inches.

The purpose of the qualification process is to determine if a manufacturer’s product conforms to USDA Forest Service specifications. For example, the qualification of pumps includes a visual inspection, a priming test, a drafting test, an engine test, an endurance performance test, a spark arrester test, and a sound test. Testing and evaluation is conducted by the government at the expense of the contractor. Once a product is determined to meet the minimum specification requirements, the product is assigned a Qualified Products List (QPL) number and is added to the QPL.

A woven hose that does not incorporate a tube. Designed to seep, and manufactured of linen yarn. Normally used as emergency hose, but used in wildland fires due to its resistance to hot spots that would burn through other types of hose.

The wetting and close up period of a dry unlined hose.

The twisting of a hose when hydrostatic pressure is applied. The twisting is either left or right as observed in the direction of flow.

A textile yarn spun and twisted from staple-length fiber, either natural or synthetic.