Page 106 - 2010-2022 hose manufactureing ability and guide

psi: the abbreviation for pounds per square rise test: a determination of the distance a fire
inch. hose, under a specified internal pressure, lifts
from the surface on which is rests.
pulled-down tube: see loose tube.
roll ratio: the ratio of the surface speeds of
pure gum: a rubber compound containing only
those ingredients necessary for vulcanization; two adjacent mill or calendar rolls.
particularly applicable to natural rubber. RMA: the abbreviation of The Rubber
Manufacturers Association.
Q
rough bore hose: a wire reinforced hose in
qualification test: the examination of samples which a wire is exposed in the bore.
from a typical production run of hose to
determine adherence to a given specification; rubber: elastomer which can be, or already is,
performed for approval as a supplier. modified to a state in which it is essentially
insoluble (but can swell) in boiling solvent,
quality conformance inspection or test: the such as benzene, methyl ethyl ketone and
examination of samples from a production run
of hose to determine adherence to given ethanol-toluene azeotrope, and which in its
modified state cannot be easily remoulded to a
specifications, for acceptance of that production
run. permanent shape by the application of heat and
moderate pressure.
R
rubber cement: see cement.
RAC: the abbreviation for the Rubber
Association of Canada. S
rag-wrap: see wrapped cure. SAE: Society of Engineers
recovery: the degree to which a hose returns to safety factor: see design factor.
its normal dimensions or shape after being sampling: a process of selecting a portion of a
distorted. quantity of a hose for testing or inspection,
reinforcement: (1) the strengthening selected without regard to quality,
members, consisting of either fabric, cord, and/ scorch: premature vulcanization of a rubber
or metal, of a hose; (2) the non-rubber elements
of a hose. See also: carcass compound.
reinforcing agent: an ingredient (not basic to screw-together resuable fitting: a type of
the vulcanization process) used in a rubber hose fitting whose SOCKET and NIPPLE are
compound to increase its resistance to threaded together in combination with the hose.
mechanical forces. seam: a line formed by the joining of the edges
resin: a compounding material, solid or liquid of a material to form a single ply or layer.
in form, used to modify the processing and/or seaming strip: a strip of material laid over a
vulcanized characteristics of a compound. seam to act as a binder.

retarder: a compounding ingredient used to self cure: see air cure.
reduce the tendency of a rubber compound to
vulcanize prematurely. selvage: the lengthwise woven edge of a
fabric. Also called selvedge.
reusable coupling: see reusable fitting.
semi-cure: a preliminary but incomplete cure
reusable fitting: the type of fitting which, by applied to a tube or hose in the process of
design, may be removed and reused. manufacture to cause the tube or hose to acquire
reversion: the softening of vulcanized rubber a degree of stiffness or to maintain some
when it is exposed to an elevated temperature; a desired shape, service pressure: see working
deterioration in physical properties. (Extreme pressure.
reversion may result in tackiness.) service test: a test in which the product is used
under actual service conditions.

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