MaTestLab > ASTM Methods > ASTM D1785 Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120
Last updated 12th June 2025
ASTM D1785 Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules 40, 80, and 120
ASTM D1785 is a certain standard that controls the dimensional and performance requirements for plastic pipes in the schedules 40, 80, and 120. These pipes are used for pressure-aspect applications in large-scale fluid transport systems. Specification details of the thickness of the wall, outer diameter, burst pressure, and flat requirements for PVC pipes used in both top-land and buried installations. It covers pipes of 1/8 inch to 24 inch diameter and ensures compatibility with threaded and solvent-welded fittings. ASTM D1785 is important to standardize pressure-rated piping in both industrial and residential systems.
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ASTM D1785 Introduction
ASTM D1785 is the specification that controls dimensional and performance requirements for poly(vinyl chloride) (PVC) plastic pipe in Schedule 40, Schedule 80, and Schedule 120. The pipes have broad applications for pressure-carrying services in fluid conveying systems. The standard defines wall thickness, outside diameter, burst pressure, and flattening for PVC pipes in above- and below-ground service installations. The standard covers pipes ranging from 1/8 inch to 24 inches in diameter and ensures compatibility with both threaded and solvent-welded pipe fittings. ASTM D1785 is needed to standardize pressure-rated piping in industrial and residential systems.
ASTM D1785 Test Method
Hydrostatic Pressure Test
Pipe sections are filled with water and subjected to internal pressure (e.g., 600 psi for Schedule 80) for at least 1 hour to check for leaks or rupture.
Flattening Test
A pipe segment is compressed between parallel plates until it reaches two-thirds of its original diameter; failure includes cracking or splitting.
Impact Resistance Test
A weighted tup is dropped from a specified height (e.g., 1.5 m) onto a conditioned pipe section to verify resistance to brittle fracture.
ASTM D1785 Equipment and Sample Preparation
Pipe Cutting Saw
Used to cut pipe segments precisely to 6-inch lengths for uniform testing without deforming ends.
Flattening Test Specimen
A 6-inch long section of pipe, with ends chamfered and no surface defects; wall thickness measured per schedule.
Impact Test Specimen
An 8-inch long pipe section, conditioned at 23°C for 24 hours; the edges must be smooth to avoid stress points.
ASTM D1785 Results and Interpretation
Test values should be within the failure and tolerance limits as defined. Under a hydrostatic test, any leakage or bursting indication renders the pipe unacceptable for pressure-rated applications. Flattening tests are visually examined and should contain no rupture, delamination, or cracking at fold points. Impact resistance testing determines the resistance of the pipe to handle and install stress; failure is evidenced by visible fracture or brittle splitting. Values are taken with batch identification for traceability and can determine acceptance, rejection, or retest of the lot.
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ASTM D1785 Related Articles
Procedures for long-term hydrostatic pressure tests to predict ASTM D1598 service life. The ASTM D2412 specifies the test for the pipe stiffness under diametric loading, required for the performance performance. ASTM D2564 outlines requirements for solvent cements that are used to safely involve PVC piping in pressure applications. These standard quality controls ensure comprehensive quality controls from pipe construction to system assembly.
Materials Commonly Tested with ASTM D1785
ASTM D1785 is particularly applied to uncontrolled PVC (UPVC) compounds that complete minimum cell classifications. These compounds are rigid, white or gray, and are designed for pressure service. Aditives such as stabilizers and lubricants are controlled to ensure stability in mechanical and chemical performance.
Applications of ASTM D1785 in Industry
Pipes under this standard are used extensively in municipal water supply networks, residential plumbing, drainage systems, and chemical handling in industrial plants. Schedule 40 pipes are common in residential cold water systems, Schedule 80 in industrial process lines, and Schedule 120 under high pressure, special systems such as fire suppression and laboratory applications.
Safety and Best Practices in ASTM D1785
The UV stresses the proper handling and storage to avoid UV fall and impact damage before installation ASTM D1785. Pipes should be tested under controlled temperature and pressure conditions to ensure a safety margin. It also makes the visible marking of schedule, manufacturer, and compliance details to reduce the risk of misuse or installation error.
Importance of ASTM D1785
ASTM D1785 plays an important role in ensuring the structural integrity and performance of the pressure piping system made from standard PVC. This enables manufacturers to give reliable and equal products by giving them confidence to engineers and installers in long-term system safety. Without such specifications, discrepancies in the quality of the pipe may cause system failure, safety threats, and financial losses in infrastructure projects.
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Where can I get the astm d1785 tested?
You can share your astm d1785 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d1785 test to various testing techniques.
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