GLOSSARY
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R
RAILROADING
The application of wallcovering strips
in a horizontal plane.
REACTIVE DILUENT
A coating viscosity reducer that has
low volatility and becomes a permanent part of the coating through chemical
reaction, usually under ambient conditions.
RECOAT TIME
Time interval required between applications
of successive coats.
REDUCER
A volatile liquid added to a coating,
varnish, resin, latex, or emulsion for the purpose of lowering its viscosity
and/or none volatile content (percent solids).
REFLECTANCE
The ability of a coating film to reflect
or return the light that falls upon its surface.
RELIEF
A type of decoration in which a design
is made prominent by raising it or by cutting away the surface or background
of the material. High relief means greatly raised design; low relief
means a slightly raised one. Shadow is often used to create relief effect
in wallcovering.
REPEAT
The distance from the centre of one motif
or pattern of a wallcovering to the centre of the next.
REPLICA TAPE
A specially constructed tape used to
measure surface profile. The tape is pressed against the surface, after
which the impression created by the profile in the tape is measured
with a micrometer.
RESIN
General term applied to a wide variety
of more or less transparent and fusible products, which are of natural
or synthetic origin. They vary widely in colour.
RESPIRATOR
A mask covering the user’s breathing
zone that either supplies breathable air or filters impurities from
the ambient air.
RESPIRATOR FIT TEST
Tests undertaken to assure that a respirator
properly fits an employee. Qualitative fit tests are used for half-mask
respirators. Quantitative fit tests are required for negative pressure
respirators.
RETARDER
A component added to a coating to slow
down a particular chemical or physical change. For example, a slowly
evaporating solvent may be added to a paint to delay the setting of
the coating film after application.
RETREATING COLOUR
Colour such as blue or green that sometimes
give the appearance of retreating from the viewer.
RIDGING
See BEADING.
RIGGING
The process of selecting and setting
up supports, cables and ropes, and scaffolding systems to provide safe
access to elevated work areas.
ROLLING SCAFFOLD
Type of scaffold.
ROOF COATING
An asphalt material designed for application
to asphalt roofs.
ROPE GRAB
A metal device that attaches to one end
of a lanyard and fits onto a lifeline. It is designed not to move when
pulled downward so that it will prevent a worker who falls from an elevated
work site from sliding down the lifeline.
ROPEY
Quality of paint that does not flow out
evenly and dries with slight ridges. This effect also can be the result
of poor workmanship when a coating is applied too thick in one spot
and too thin in an adjacent spot.
ROSIN
Natural resin obtained from living pine
trees or from dead tree stumps and knots.
ROTARY PEENER
A rotary impact power tool that uses
rotating action to impact different shapes of heavy-duty steel cutters
against a steel or concrete surface to remove heavy coatings and contaminants.
ROTTENSTONE
A brown siliceous stone used as an abrasive;
similar in nature to pumice stone, though softer in texture.
RUBBING VARNISH
A varnish formulated to provide high
gloss and good rubbing and polishing characteristics. It produces a
hard, brittle, clear film that has little exterior durability or water
resistance.
RUN (sag, sagging)
Irregularity of a coating surface due
to the application of paint that is too thick (heavy). When excessive
paint flows out unevenly, runs are produced.
RUST
Reddish, brittle material, primarily
hydrated iron oxide, that forms on iron and ferrous metals as a result
of exposure to humid atmosphere or chemical attack.
RUST GRADE
The initial condition of unpainted steel before surface preparation.
- RUST GRADE A - The steel surface is completely covered with adherent mill scale; little or no rust is visible.
- RUST GRADE B - The steel surface is covered with both mill scale and rust.
- RUST GRADE C - The steel surface is completely covered with rust; little or no pitting is visible.
- RUST GRADE D - The steel surface is completely covered with rust and pitting is visible.
