Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
Definitions /Dictionary/Glossary - nptel
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Resin Viscosity: Viscous property of a resin system or solid to liquid transition resistance to<br />
flow, which can be altered by temperature and pressure as necessary to achieve desired flow<br />
characteristics.<br />
Reverse Impact Test: In which one side of a sheet of material is struck by a pendulum or falling<br />
object and the reverse side is inspected for damage.<br />
Reverse Sandwich Lay-Up: A laminate arrangement in which the reinforced mat is laminated<br />
between outer layers of other materials.<br />
RIB: A reinforcing member of a fabricated or molded part.<br />
Ribbon Direction: On a honeycomb core, the way the honeycomb can be separated. The<br />
direction of one continuous ribbon.<br />
Roll-Out: A process used in spray-up and hand lay-up procedures where the resin and glass<br />
reinforcement are compacted to a uniform laminate with rollers.<br />
Room Temperature Curing Adhesives: Adhesives that set (to handling strength) within an<br />
hour at temperatures from 68 to 86 F, and later reach full strength without heating.<br />
Roving: A number of strands, tows, or ends collected into a parallel bundle with little or no<br />
twist. In spun yarn production, it is an intermediate state between sliver and yarn.<br />
Roving (filament winding): The term roving is used to designate a collection of bundles of<br />
continuous filaments either as untwisted strands or as twisted yarns. Roving may be lightly<br />
twisted, but for filament winding they are generally wound as bands or tapes with as little twist<br />
as possible. Glass rovings are predominantly used in filament winding.<br />
Roving Ball: A term used to describe the supply package offered to the winder. It consists of a<br />
number of ends or strands wound to a given outside diameter onto a length of cardboard tube.<br />
RP: Reinforced plastic, polymer, or polyester.<br />
RTA (Room Temperature Ambient): An environmental condition 73(5( (23(3(C) at ambient<br />
laboratory relative humidity; 2) a material condition where, immediately following<br />
consolidation/cure, the material is stored at 73(5( (23(3(C) and at a maximum relative humidity<br />
of 60%.<br />
RTP: Sometimes used to distinguish reinforced thermoplastic from reinforced thermosetting<br />
plastic.<br />
Rubber Plunger Molding: A variation of the matched-die molding process which uses a heated<br />
metal female mold (or outer half) and a rubber plunger male mold. Applicable for relatively<br />
small molds with modest undercuts where low pressures are involved.