ASTM F2735-23

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
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: F2735 − 21 F2735 − 23 An American National Standard
Standard Specification for
Plastic Insert Fittings For SDR9 Cross-linked Polyethylene
(PEX) and Polyethylene of Raised Temperature (PE-RT)
Tubing
This standard is issued under the fixed designation F2735; 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*
1.1 This specification establishes requirements for sulfone plastic insert fittings and copper crimp rings for three sizes
1 3
( ⁄2, ⁄4, and 1) of cross-linked polyethylene (PEX) tubing that meet the requirements for Specification F876 or F3253, and
polyethylene of raised temperature (PE-RT) tubing that meet the requirements of Specification F2623. These fittings are intended
for use in 100 psi (690 kPa) cold- and hot-water distribution systems operating at temperatures up to and including 180 °F (82 °C).
Included are the requirements for material, molded part properties, performance, workmanship, dimensions, and markings to be
used on the fittings and rings.
1.2 Units—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 is an index of the appendix in this specification.
GO/NO-GO Crimp Gauges Appendix X1
1.4 The following precautionary caveat pertains only to the test method portions, Sections 11 and 12, of this specification. 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, health, and environmental practices and determine the applicability of regulatory
limitations prior to use.
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:
D1600 Terminology for Abbreviated Terms Relating to Plastics
D2122 Test Method for Determining Dimensions of Thermoplastic Pipe and Fittings
D2837 Test Method for Obtaining Hydrostatic Design Basis for Thermoplastic Pipe Materials or Pressure Design Basis for
Thermoplastic Pipe Products
D6394 Classification System for and Basis for Specification for Sulfone Plastics (SP)
This specification is under the jurisdiction of ASTM Committee F17 on Plastic Piping Systems and is the direct responsibility of Subcommittee F17.10 on Fittings.
Current edition approved May 1, 2021April 1, 2023. Published May 2021April 2023. Originally approved in 2008. Last previous edition approved in 2020 as F2735–20.
DOI:10.1520/F2735–21.2021 as F2735–21. DOI:10.1520/F2735–23.
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
F2735 − 23
F412 Terminology Relating to Plastic Piping Systems
F876 Specification for Crosslinked Polyethylene (PEX) Tubing
F877 Specification for Crosslinked Polyethylene (PEX) Hot- and Cold-Water Distribution Systems
F1498 Specification for Taper Pipe Threads 60° for Thermoplastic Pipe and Fittings
F1807 Specification for Metal Insert Fittings Utilizing a Copper Crimp Ring, or Alternate Stainless Steel Clamps, for SDR9
Cross-linked Polyethylene (PEX) Tubing and SDR9 Polyethylene of Raised Temperature (PE-RT) Tubing
F1960 Specification for Cold Expansion Fittings with PEX Reinforcing Rings for Use with Cross-linked Polyethylene (PEX)
and Polyethylene of Raised Temperature (PE-RT) Tubing
F2623 Specification for Polyethylene of Raised Temperature (PE-RT) Systems for Non-Potable Water Applications
F3253 Specification for Crosslinked Polyethylene (PEX) Tubing with Oxygen Barrier for Hot- and Cold-Water Hydronic
Distribution Systems
2.2 ASME Standard:
B1.20.1 Pipe Threads General Purpose Inch
2.3 NSF International Standard
NSF/ANSI Standard No,No. 14 for Plastic Piping Components and Related Materials
NSF/ANSI Standard No. 61 for Drinking Water System Components-Health Effects
2.4 ISO Standards:
ISO 9080 Plastics piping and ducting systems -- Determination of the long-term hydrostatic strength of thermoplastics materials
in pipe form by extrapolation
ISO 12162 Thermoplastics materials for pipes and fittings for pressure applications –Classification, designation and design
coefficient
3. Terminology
3.1 Definitions—Definitions are in accordance with Terminology F412 and abbreviations are in accordance with Terminology
D1600, unless otherwise indicated.
4. Classification
1 3
4.1 This specification governs one class of fittings and copper crimp rings suitable for use with nominal size ⁄2, ⁄4, and 1 size
PEX tubing that meets the requirements of Specification F876 or F3253 and polyethylene of raised temperature (PE-RT) tubing
that meets the requirements of Specification F2623.
5. Ordering Information
5.1 Material—Material—FittingsFittings shall be molded from sulfone plastic (SP) as specified in SpecificationClassification
D6394. The material shall be polyphenylsulfone (group 03, class 1, grade 1 or 2) or unreinforced polyphenylsulfone/polysulfone
blends (group 04, Class 2, grade 1) or reworked plastic in accordance with 5.1.1. Colored products can exceed the maximum
specific gravity listed provided that they comply with all other properties listed in SpecificationClassification D6394 Table SP.
NOTE 1—Since fittings specified by this standard will be used in hot-and-cold water plumbing systems, a material used to manufacture fittings in
accordance with this specification must demonstrate qualities consistent with that application in addition to the performance requirements of this
specification. Those qualifying characteristics include, but are not limited to, an established hydrostatic design basis (HDB) in accordance with Test
Method D2837 or ISO 9080/ ISO 12162 minimum required strength (MRS) and a demonstration of resistance to the long-term effects of those chemicals
normally found in potable water at the maximum temperature stated in this specification.
5.1.1 Rework Material—Clean rework material of the same commercial designation, generated from the manufacturer’s own
production may be used by the same manufacturer, provided the fittings meet all of the requirements of this specification.
Reworked material shall not be introduced at a ratio exceeding 25 %.
5.2 Potable Water Requirements—Products intended for the transport of potable water shall be evaluated, tested and certified for
conformance with NSF/ANSI Standard No. 61 or the health effects portion of NSF/ANSI Standard No. 14 by an acceptable
certifying organization when required by the regulatory authority having jurisdiction.
Available from American Society of Mechanical Engineers (ASME), ASME International Headquarters, Two Park Ave., New York, NY 10016-5990, http://
www.asme.org.
Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., Ann Arbor, MI 48113-0140, http://www.nsf.org.
Available from International Organization for Standardization (ISO), ISO Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier, Geneva,
Switzerland, http://www.iso.org.
F2735 − 23
5.3 Crimp Rings—Crimp rings shall be manufactured and marked in accordance with the requirements of Specification F1807.
NOTE 1—All wetted and pressure carrying polymeric materials used to manufacture the fittings should be suitable for the intended applications, that is,
hot and cold potable water plumbing systems, in addition to the performance requirements of this specification. Those qualifying characteristics include
but are not limited to an established hydrostatic design basis (HDB) in accordance with Test Method D2837 or a minimum required stress (MRS) in
accordance with ISO 9080/ ISO 12162 and a demonstration of resistance to the long-term effects of those chemicals normally found in water conveyed
in these applications (for example, disinfectants such as sodium hypochlorite used in potable water) at the maximum temperature stated in this
specification.
6. Molded Part Properties
6.1 Insert Crush—The fitting insert shall not crack, split, or shatter when tested in accordance with 12.1.
6.2 Splay—The molded part shall be free of visible splay excepting some slight blushing at the gate location.
7. Performance Requirements
7.1 General—All performance tests shall be performed on assemblies of fittings, crimp rings, and PEX tubing. Fittings and crimp
rings shall meet the material and dimensional requirements of this standard. PEX tubing shall meet the requirements of
Specification F876 or F3253. Assembly of test specimens shall be in accordance with Section 10. Use separate sets of assemblies
for each performance test requirement.
7.2 The following sections of Specification F877 constitute a part of this specification:
7.2.1 Hydrostatic Burst,
7.2.2 Hydrostatic Sustained Pressure Strength,
7.2.3 Thermocycling,
7.2.4 Excessive Temperature-Pressure Capability, and
7.2.5 Test Methods.
7.3 In addition, when a section with a title identical to that referenced in 7.2 appears in this specification, it contains additional
requirements that supplement those appearing in Specification F877.
8. Dimensions
8.1 Dimensions and Tolerances—The dimensions and tolerances of fittings shall be as shown in Fig. 1, when measured in
accordance with 11.1
8.1.1 Alignment—The maximum angular variation of any opening shall not exceed 1° off the true centerline axis.
8.1.2 Tapered Threads—Fitting threads shall be American National Standard Taper Pipe Thread Form conforming to Specification
F1498.
8.1.3 Straight Threads—Straight pipe threads, intended for the making of a gasketed seal with taper pipe threads, shall be
American National Straight Pipe Thread for Fixtures (free-fitting mechanical joints), NPSM, and conf
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