ASTM D5685-19

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D5685 − 11 D5685 − 19 An American National Standard
Standard Specification for
“Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin)
Pressure Pipe Fittings
This standard is issued under the fixed designation D5685; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope Scope*
1.1 This specification covers “fiberglass” (glass-fiber-reinforced thermosetting-resin) fittings for use with filament wound or
centrifugally cast fiberglass pipe, or both, in sizes 1 in. through 24 in. for pipe manufactured to Specification D2996 or D2997,
or both.
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only and are not considered standard.
1.3 The following safety hazard caveat pertains only to the test method portion, Section 7, of this specification:
1.4 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
NOTE 1—The term “fiberglass pipe” as described in Section 3 of this specification applies to both reinforced thermosetting resin pipe (RTRP) and
reinforced polymer mortar pipe (RPMP).
NOTE 2—For the purposes of this standard, ploymerpolymer does not include natural polymers.
NOTE 3—There is no known ISO equivalent to this standard.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D618 Practice for Conditioning Plastics for Testing
D883 Terminology Relating to Plastics
D1598 Test Method for Time-to-Failure of Plastic Pipe Under Constant Internal Pressure
D1599 Test Method for Resistance to Short-Time Hydraulic Pressure of Plastic Pipe, Tubing, and Fittings
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2143 Test Method for Cyclic Pressure Strength of Reinforced, Thermosetting Plastic Pipe
D2310 Classification for Machine-Made “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe (Withdrawn 2017)
D2992 Practice for Obtaining Hydrostatic or Pressure Design Basis for “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-
Resin) Pipe and Fittings
D2996 Specification for Filament-Wound “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe
D2997 Specification for Centrifugally Cast “Fiberglass” (Glass-Fiber-Reinforced Thermosetting-Resin) Pipe
D3567 Practice for Determining Dimensions of “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Pipe and Fittings
D4024 Specification for Machine Made “Fiberglass” (Glass-Fiber-Reinforced Thermosetting Resin) Flanges
F412 Terminology Relating to Plastic Piping Systems
F477 Specification for Elastomeric Seals (Gaskets) for Joining Plastic Pipe
This specification is under the jurisdiction of ASTM Committee D20 on Plastics and is the direct responsibility of Subcommittee D20.23 on Reinforced Plastic Piping
Systems and Chemical Equipment.
Current edition approved Feb. 1, 2011April 1, 2019. Published March 2011May 2019. Originally approved in 1995. Last previous edition approved in 20052011 as
D5685 - 05.D5685 - 11. DOI: 10.1520/D5685-11.10.1520/D5685-19.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D5685 − 19
2.2 ANSI Standard:
B16.5 Steel Pipe Flanges, Flanged Valves and Fittings
3. Terminology
3.1 Definitions:
3.1.1 General—Definitions are in accordance with Terminology D883 or F412. Abbreviations are in accordance with
Terminology D1600, unless otherwise indicated. The abbreviation for fiberglass pipe is RTRP and the abbreviation for fiberglass
fittings is RTRF.
3.1.2 “fiberglass” pipe—tubular product containing glass fiber reinforcements embedded in or surrounded by cured
thermosetting resin. The composite structure may contain aggregate, granular or platelet fillers, thixotropic agents, pigments, or
dyes. Thermoplastic or thermosetting liners or coatings may be included.
3.1.3 reinforced thermosetting resin pipe—fiberglass pipe without aggregate (RTRP).
3.1.4 reinforced polymer mortar pipe—fiberglass pipe with aggregate (RPMP).
3.1.5 reinforced thermosetting resin fitting—fiberglass fitting without aggregate (RTRF).
3.1.6 reinforced polymer mortar fitting—fiberglass fitting with aggregate (RPMF).
4. Classification
4.1 This specification covers fiberglass fittings defined by type (method of manufacture), grade (general resin type), class
(general liner type), catagorycategory (configuration of joining system), and pressure rating ( a single letter disignatingdesignating
the pressure class and method of manufacture).
4.2 Types:
4.2.1 Type 1—Filament-wound fittings manufactured by winding continuous fibrous-glass strand roving or roving tape, either
preimpregnatedpre-impregnated or impregnated during winding, onto a mandrel, or a liner corresponding to the fitting shape.
4.2.2 Type 2—Compression molded fittings made by applying external pressure and heat to a molding compound that is
confined within a closed mold.
4.2.3 Type 3—Resin transfer molded fittings manufactured by pumping a thermosetting resin into glass reinforcements that have
been cut to size and clamped between matched molds.
4.2.4 Type 4—Centrifugally cast fittings made by applying resin and reinforcement to the inside of a mold that is rotating and
heated, subsequently polymerizing the resin system.
4.2.5 Type 5—Contact molded fittings made by applying resin and reinforcement to a mold or to mitered filamentwound
filament wound stock or centrifugally cast pipe stock. This procedure shall also cover “spray-up” fittings which are made by
spraying resin and reinforcement on a mold or over mitered pipe wound stock. “Contact molding” includes both hand lay-up and
spray-up manufacturing processes.
4.2.6 Fittings of Type 1 through Type 5 which require thrust blocking or external axial restraint when installed shall have the
letter “R” appended to the type of designation. ( For instance, a contact molded fitting requiring thrust blocking when installed
would be designated a type “5R”.)
4.3 Grades:
4.3.1 Grade 1—Epoxy-resin.
4.3.2 Grade 2—Polyester-resin.
4.3.3 Grade 3—Phenolic-resin.
4.3.4 Grade 4—Vinylester resin.
4.3.5 Grade 7—Furan resin.
4.4 Classes:
4.4.1 Class A—No liner.
4.4.2 Class B—Polyester-resin liner (nonreinforced).
4.4.3 Class C—Epoxy-resin liner (nonreinforced).
4.4.4 Class D—Phenolic resin liner (nonreinforced).
4.4.5 Class E—Polyester-resin liner (reinforced).
4.4.6 Class F—Epoxy-resin liner (reinforced).
4.4.7 Class G—Phenolic resin liner (reinforced).
4.4.8 Class H—Thermoplastic-resin liner (specify).
4.4.9 Class I—Furan-resin liner (reinforced).
4.4.10 Class J—Vinylester resin liner (nonreinforced).
4.4.11 Class K—Vinylester resin liner (reinforced).
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.
D5685 − 19
4.5 Joint Categories (Method of Joining):
4.5.1 Category 1—Taper-to-taper adhesive-bonded joint fittings manufactured with a tapered socket to be used in conjunction
with a pipe or fitting with a matching spigot section and a suitable adhesive. This joining method provides an interference fit over
the entire length of the bond line.
4.5.2 Category 2—Straight-taper adhesive-bonded joint fitting manufactured with a tapered socket to be used with a pipe or
fitting with an untapered spigot section and a suitable adhesive. This joining method provides an interference fit at the bottom of
the socket.
4.5.3 Category 3—Straight adhesive bonded joint fitting manufactured with an untapered socket for use with a pipe or fitting
with an untapered spigot and a suitable adhesive. This joining provides no interference fit.
4.5.4 Category 4—Butt and strap joint made by a contact molding process which involves hand lay-up with glass-woven roving
or chopped strand mat, or both, which is saturated with resin.
4.5.5 Category 5—Flanged fittings are available as all outlets flanged or as flange-by-joint specified in this specification. Flanges
are in compliance with Specification D4024.
4.5.6 Category 6—Elastomeric (gasket) sealed joints with sealant manufactured in compliance with Specification F477 for
joints which have integral longitudinal restraint and do not require thrust blocking or external longitudinal restraint.
4.5.7 Category 7—Elastomeric (gasket) sealed joints with seals manufactured in compliance with Specification F477 for joints
which require thrust blocking or external longitudinal restraint.
4.5.8 Category 8—Threaded joint fittings with thread specification to be as agreed upon between purchaser and manufacturer.
4.6 Pressure Rating—Pressure rating shall be categorized by a single letter designation. Pressure designations are shown in
Table 1. The pressure ratings are applicable for the temperature at which the fittings were tested and for lower temperatures down
to −50°F (−46°C). When agreed upon between purchaser and manufacturer, pressure ratings determined by tests conducted
following Practice D2992 are acceptable.
4.7 Designation Code—The fitting designation code shall consist of the abbreviation RTRF or RPMF followed by the type,
grade, class, and classcategory in Arabic numerals and the pressure rating category as a capital letter.
NOTE 4—An example is RTRF 21A2E. This designation describes a (Type 2) compression molded fitting with a (Grade 1) epoxy-resin without a liner
(Class A), which is joined with a (Category 2) taper-to-taperstraight-taper adhesive joining system and has a 200 psig (1380 kPa) pressure rating.
NOTE 5—Fittings with identical classification from different manufacturers may not be interchangeable due to non-standardization of pipe or socket
diameter, socket length, taper angle, or combination thereof.
5. Materials
5.1 Fittings manufactured in accordance with this specification shall be composed of reinforcement embedded in or surrounded
by cured thermosetting-resin. The composite structure may contain granular or platelet fillers, thixotropic agents, pigments, or
dyes.
5.2 The resins, fiberglass reinforcements, and other materials, when combined into a composite structure, shall produce a fitting
that will meet the performance requirements of this specification.
6. Requirements
6.1 Workmanship—The fittings shall be free of all defects including indentations, delaminations, bubbles, pin holes, foreign
inclusions, and resin starved areas, which, due to their nature, degree, or extent, detrimentally affect the strength and serviceability
of the fitting. The fitting shall be as uniform as commercially practicable in color, opacity, and other physical properties.
TABLE 1 Pressure Categories
A
Designation Pressure Rating , psig (kPa)
A 25 (172)
B 50 (345)
C 100 (690)
D 150 (1034)
E 200 (1380)
F 250 (1724)
G 300 (2068)
H 400 (2759)
I 500 (3448)
J 1000 (6896)
J 750 (5171)
K 1000 (6895)
A
Pressure ratings are applicable only fo
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