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ANSI/AWWA C105/A21.5-10 Standard
The 2010 revision of ANSI/AWWA C105/A21.5-10 Standard incorporated a major change in Verification of specified polyethylene film regarding quality control and inspection requirements plus a requirement for an Affidavit of Compliance from the manufacturer.
When the ANSI/AWWA C105/A21.5 Standard was first published in 1972, the 8-mil LDPE film was thought to be the best available material for the intended application. Technological advances in the polyethylene film industry have produced the LLDPE film that is stronger and more damage-resistant.
LLDPE has been used for a number of years in Australia, and its material requirements are patterned after the Australian Standard for Polyethylene Sleeving for Ductile Iron Pipelines (AS 3680). By way of comparison, minimum material properties for LLDPE and HDCLPE are shown in the table below.
In summary: By incorporating a stronger material, adding additional impact and tear requirements, eliminating the minus thickness tolerance, incorporating marking requirements, and requiring an ultraviolet inhibitor for non-carbon black film, the standard has been strengthened and will ensure a quality product for the end user.
|
Film |
Tensile Strength (psi) |
Tensile Strength (lbs/in) |
Elongation (%) |
Dielectric Strength (V/mil) |
Impact Resistance (grams) |
Propagation Tear Resistance (gram force) |
Minimum Thickness (mil) |
|
LLDPE |
3.600 |
28.8 |
800 |
800 |
600 |
2.550 |
8 |
|
HDCLPE |
6.300 |
25.2 |
100 |
800 |
800 |
250 |
4 |
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© Repcor, Inc. 2005 Last Revision: January 13, 2011