Standard Specification for
Contact Molded “Fiberglass” (Glass Fiber Reinforced
Thermosetting Resin) Duct and Hoods1
This standard is issued under the fixed designation D 3982; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1.1 This specification covers ducts and hoods fabricated by
contact molding intended for use in handling corrosive fumes
and process gases. Special attention is given to equipment that
operates at temperatures over 180°F (82.2°C) with regard to
strength and corrosion resistance.
1.2 The material of construction shall be “fiberglass” consisting of a polyester, vinyl ester, or other qualified resin-matrix
systems with fiber reinforcement in accordance with Specification C 582.
1.3 This specification is not intended to cover a selection of
resins and reinforcements for specific chemical environments.
1.4 All descriptions and limitations in this specification are
to include both ducts and hoods, where applicable.
1.5 This specification covers ducts and hoods up to a design
the pressure of 65 psi (34.5 Pa).
1.6 The values stated in inch-pound units are to be regarded
as the standard. The SI units given in parentheses are for
1.7 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
NOTE 1—There is no similar or equivalent ISO standard.
2. Referenced Documents
2.1 ASTM Standards: 2
C 581 Practice for Determining Chemical Resistance of
Thermosetting Resins Used in Glass Fiber Reinforced
Structures, Intended for Liquid Service
C 582 Specification for Contact-Molded Reinforced Ther
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