PEX Water Pipe
Common Product
MasterFormat 22 11 00 Facility Water Distribution; 22 11 16 Domestic Water Piping; 40 23 23 Potable Water Process Piping

This information reflects our best understanding of product composition in 2021.

Crosslinked polyethylene, or PEX, is a polyethylene based polymer that has undergone crosslinking and can be used in potable water distribution. Currently, there are three methods for producing PEX tubing, the “Engle” or “Peroxide” (PEX-A) method...

More about PEX Water Pipe

Crosslinked polyethylene, or PEX, is a polyethylene based polymer that has undergone crosslinking and can be used in potable water distribution. Currently, there are three methods for producing PEX tubing, the “Engle” or “Peroxide” (PEX-A) method, the “Silane” (PEX-B) method, and the “E-beam” (PEX-C) method. All three processes produce tubing that exceed the minimum requirements of ASTM F876 and are acceptable for potable water distribution applications. The final composition of these pipes is expected to be similar and all are included in the scope of this CP. Additionally, PEX has uses in plumbing, drainage, and fire surpression; however, these use cases were not the primary focus of this CP. Similarly to other plastic water pipes, PEX water pipes make use of additives, particularly antioxidants, UV stabilizers, and pigments. Antioxidants in PEX water pipes help reduce, mitigate, and in some cases even prevent the oxidation of PEX, which can occur primarily due to the chlorine in potable water applications. PEX water pipes also require UV stabilizers, such as hindered amine light stabilizers (HALS) to combat the effect of UV light degradation. Leaching has been observed with the use of PEX pipes, which is why preliminary flushing prior to use is critical, in addition to utilizing the PEX tubing at a temperature no greater than 180°F. If prolonged degradation occurs, pipe additives and degradation products may be found in potable water coming from any PEX pipe over extended period time (Lützhøft et al., 2013). There is indication of industry movement toward antioxidants with lower leachability such as sulfur containing phenolics and HALS (Sahar). See the Process Chemistry tab for leachants that were identified in our research.

The historical version of this CP can be found here: https://pharosproject.net/common-products/2209588#contents-panel

Name % Wt Whole Function GS Score Sources
Polyethylene
9002-88-4
98.70% Polymer Subscribe to view
Tris(2,4-di-tert-butylphenyl) phosphite
31570-04-4
0.55% Antioxidant Subscribe to view
Hydrocinnamic acid, 3,5-di-t-butyl-4-hydroxy-, octadecyl ester
2082-79-3
0.42% Antioxidant Subscribe to view
Titanium dioxide
13463-67-7
0.20% Pigment Subscribe to view
Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate
52829-07-9
0.13% UV Stabilizer Subscribe to view
Name % Wt Part % Wt Whole Function GS Score Sources
Polyethylene
9002-88-4
98.70% 98.70% Polymer Subscribe to view
Tris(2,4-di-tert-butylphenyl) phosphite
31570-04-4
0.55% 0.55% Antioxidant Subscribe to view
Hydrocinnamic acid, 3,5-di-t-butyl-4-hydroxy-, octadecyl ester
2082-79-3
0.42% 0.42% Antioxidant Subscribe to view
Titanium dioxide
13463-67-7
0.20% 0.20% Pigment Subscribe to view
Bis(2,2,6,6-tetramethyl-4-piperidinyl) sebacate
52829-07-9
0.13% 0.13% UV Stabilizer Subscribe to view

Log in or create an account to view All Contents

Known or Potential Residuals
Known or Potential Residuals for Chemical
CASRN NAME GS SCORE TYPE FREQUENCY % WT CHEM % WT PRODUCT SOURCE
Log in or create an account to view Known or Potential Residuals
Other Process Chemicals
CASRN NAME GS Score TYPE FREQUENCY % WT CHEM % WT PRODUCT SOURCES
Log in or create an account to view Other Process Chemistry
HBN Resources (2)
HBN Resources for Product
TYPE TITLE
Report Healthy Environments: What's New (and What's Not) With PVC
Tool Water Pipes Hazard Spectrum
Sources
Sources for Common Product Data
Source Uploaded Document Linked Document
1,1,2-Trichloroethane
1,2-Dichloroethane
1,2-Dichloroethane methylene chloride
1/2" 25×12ft Red PureLink® Plus UV Stabilized PEX-a Tubing
5,16-Androstadien-3beta-ol
A Review of Chemical Substances Shown to Leach from Common Drinking Water Piping Materials
APPEX 14
APPEX 15
Benefits of Zurn PEX
Blue PEX Pipe (Coils)
BOW Superpex Specs
BOW Superpex Technical specifications
Characterization of Leachable Chemical Substances from Common Drinking Water Piping Materials
Chimassorb 944
Deterioration of polyethylene pipes exposed to water containing chlorine dioxide
Differences between Non-Barrier, Oxygen Barrier and PEX-AL-PEX tubing
ECHA - Titanium Dioxide
EPD - Rifeng Multilayer PEX Pipe
FloFit Pipe
HALS 770
Irgafos 126
Irgafos 168 - BASF
Irgafos 168 - CIBA
Irganox 1010
Irganox 1035
Irganox 1076
Irganox 3114
Irganox PS 800 FL
LEACHABLE VOLATILE ORGANIC COMPOUNDS FROM POLYETHYLENE PLUMBING PLASTIC PIPES: A CASE STUDY OF MEDINA AL MUNAWARAH, SAUDI ARABIA
Long-term study of migration of volatile organic compounds from cross-linked polyethylene (PEX) pipes and effects on drinking water quality
Lützhøft - HS-SPME-GC-MS analysis of antioxidantdegradation products migrating todrinking water from PE materials and PEX pipes
Merflex® PEX OT® Plumbing Tubing
MrPEX - PEX-a - Pipe Data Sheet
MrPEX - PEX-a - Pipe Spec Sheet
MrPEX Plumbing
MSDS - Flofit PEX Pipes
Patent - A MULTIPURPOSE POLYMERIC PIPE
Patent - Carbon black-containing crosslinked polyethylene pipe having resistance to chlorine and hypochlorous acid
Patent - Crosslinked polyethylene articles and processes to produce same
Patent - Crosslinked polyethylene process
Patent - METHODS AND COMPOSITIONS FOR COATING PIPE
Patent - Methods and compositions for producing pipe having improved oxidative resistance
PEX - Plastic Pipe Institute
PEX and PP Water Pipes: Assimilable Carbon, Chemicals, and Odors
PEX PLUMBING SYSTEM
PEX Tubing Technical Information
PEX-a tubing why it’s better
PureLink® Plus Potable Water PEX-a Tubing (Red)
Q_PC_XWHITE
Q_PC_XWHITE Spec Sheet
Recent Updates on the Barrier Properties of Ethylene Vinyl Alcohol Copolymer (EVOH): A Review
Rifeng PEX plumbing System
Sahar Patent - Stabilised Cross-Linked Polymers
SharkBite® Potable and Fire Suppression PEX Pipe
Tinuvin 770 - BASF
Tinuvin 770 - Hunan Chem
Trigonox B
Ultranox 626 Phosphite
Ultraviolet (UV) Resistance of PEX Tubing
Uponor
Uponor AquaPEX Red Coils
Uponor AquaPEX® plumbing system disinfection guidelines
Viega PEX Solutions
Viega PureFlow PEX tubing
Viega PureFlow® PEX Tubing
WPTC-B - WATTS