p.1 

OAR Box 1490 

Prepped by Charmelle Mathews 

Document Number: 

54) IV-C-27 

Docket Number: 

A-94-52 

Printed 8/4/2008 11:51:47 AM Sheet 54 of 273 
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Office of Air Quality Planning and Standards 

Emission Standards Division 

Minerals and Inorganic Chemicals Group C504-05 

Research Triangle Park, NC 27711 

FAX COVER SHEET 

A-94-52 

IV-C-27 

TO John Barker COMPANY Strongwell 

OFFICE # FAX#

 276-645-8134 

TMOM KEITH BARNETT 

OBTICE* (919)541-5605 FAX# (919) 541-5600 

DATE May 6, 2002 NUMBER OF PAGES INCLUDING COVER SHEET 

4 

COMMENTS: 

Various definitions of pre-form injection. 
85/03/0 2 15:29 ©19199410234 PES RTP NC @003/004 

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190 

poured into the mold, they are not rolled out or worked 

prior to curing. The composite materials may or may not 

include reinforcements. Products produced by the polymer 

casting process include cultured marble products and polymer 

concrete. 

Pultrusion means a continuous process for manufacturing 

composites that have a uniform cross-sectional shape. The 

process consists of pulling a fiber-reinforcing material 

through a resin impregnation chamber or bath and through a 

shaping die, where the resin is subsequently cured. There 

are several types of pultrusion equipment, such as open 

bath,/p*e**&*R injection, and direct die injection equipment. "j( 

Resin transfer molding means a process for 

manufacturing composites whereby catalyzed resin is * 

transferred or injected into a closed mold in which 

fiberglass reinforcement has been placed. 

Sheet molding compound (SMC) means a ready-to-mold 

putty-like molding compound processed into sheet form. The 

molding compound is sandwiched between a top and a bottom 

film, and it contains resins, catalysts, fillers, chemical 

thickeners, mold release agents, reinforcements, and other 

ingredients. Sheet molding compound can be used in 

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{ 05/03/02 15:29 ®19199410234 PES RTP NC 0002/004 

New Definition 

Pre-form injection means a form of pultrusion where liquid 

resin is injected to saturate reinforcements in an enclosed 

system containing one or more chambers with openings only large 

enough to admit the reinforcements. Resin, which drips out of 

the chamber(s) during the process, is collected in closed piping 

or covered troughs and then into a covered reservoir for recycle. 

Resin storage vessels, reservoirs, transfer systems, and 

collection systems are covered or shielded from the ambient air. 

Pre-form injection differs from direct die injection in that the 

injection chambers are not directly attached to the die. 

Note: In definition of Pultrusion. also change "resin injection" 

to "pre-form injection." 

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