ASTM Plumbing Pipe

ASTM Plumbing Pipe – uPVC SCH 40, 80 & 120

An ASTM pipe is a pipe made to a standard published by ASTM International. In plumbing, it usually means a uPVC pipe made to ASTM D1785 in Schedule 40, 80 or 120. Duke Pipes makes ASTM uPVC plumbing pipe from ½” to 4″ (15–100 mm) for cold drinking water, with BSP threads that fit standard GI fittings.

Manufacturer since 1998 · Made to ASTM D1785 · SCH 40 / 80 / 120 · National Quality Award 2007 · Palanpur, Gujarat

Get today’s ASTM pipe price on WhatsApp: +91 73920 73920

Duke ASTM plumbing pipe is a lead-free uPVC pipe made to the American standard ASTM D1785. We make it in three wall thicknesses (Schedule 40, 80 and 120) in sizes from ½” to 4″. It carries cold drinking water in homes, hospitals, hotels and factories. The threaded (BSP) ends screw into standard GI fittings, so you can replace old GI lines without changing the fittings.

Every pipe is made at our own plant in Palanpur, Gujarat, where Duke Pipes has manufactured uPVC pipes since 1998. Below you’ll find the full size and pressure table, a guide to choosing the right schedule, jointing steps and answers to the questions buyers ask us most.

What is an ASTM uPVC pipe?

An ASTM uPVC pipe is an unplasticized PVC pipe whose size, wall thickness and pressure rating follow the American standard ASTM D1785. Sizes are given in inches, and wall thickness is set by “schedule”: the higher the schedule number, the thicker the wall.

ASTM stands for the American Society for Testing and Materials, now called ASTM International. It was founded in 1898 and publishes voluntary standards used in more than 140 countries. Three ASTM standards apply to this pipe:

• ASTM D1784 – the PVC compound (raw material) the pipe is made from
• ASTM D1785 – the pipe itself: sizes, wall thickness and pressure ratings for SCH 40, 80 and 120 (ASTM International)
• ASTM D2467 – the SCH 80 socket fittings used with the pipe

In India, buyers often say “ASTM pipe” to tell it apart from ISI pipe made to IS 4985. ISI pipe is sized in millimetres and graded by pressure class (kg/cm²). ASTM pipe is sized in inches, graded by schedule, and can be threaded for GI fittings. For ISI-type pipe, see our uPVC pressure pipe.

ASTM steel pipe vs ASTM uPVC pipe

“ASTM pipe” can also mean steel pipe. Here is the difference:

ASTM pipe sizes & pressure rating (kg/cm², MPa, psi)

Duke ASTM pipe comes in 9 sizes from ½” to 4″. All three schedules share the same outside diameter, so they fit the same fittings. Only the wall thickness, and therefore the pressure rating, changes.

Outside diameter and wall thickness (mm)

Working pressure at 23°C – kg/cm² (psi)

1 MPa = 10.197 kg/cm² = 145 psi · 1 kg/cm² = 14.22 psi

Need a size or schedule not listed? Call +91 73920 73920 or download the spec sheet.

Pressure at higher water temperatures

The ratings in the table are at 23°C. uPVC holds less pressure as water gets warmer, so ASTM uPVC pipe is meant for cold water and should not be used above 60°C. If your line runs warm, ask our team for the rating at your working temperature.

Packing – pieces per bundle

Which schedule do I need? SCH 40 vs SCH 80 vs SCH 120

SCH 40 is the usual choice for general plumbing, while SCH 80 and SCH 120 suit higher-pressure lines. Always choose by the working pressure for your exact pipe size in the table above, not by the schedule number alone.

Three quick checks before you order:

1. Pressure: find your pump or line pressure in kg/cm² and pick a schedule rated above it in the table.
2. Temperature: ratings are at 23°C, so if the pipe runs on a hot roof or carries warm water, ask us for the rating at that temperature.
3. Joint type: threading removes some wall thickness, so check threaded lines under pump pressure with our team before ordering.

The right ASTM pipe is the one that matches your pipe size, working pressure and application, not simply the thickest or the cheapest. Not sure which one fits? Send us your line length, pump details and building height on WhatsApp and our team will suggest the right schedule.

Where to use ASTM plumbing pipe (and where not to)

Use it for:

• Cold drinking-water lines in homes, apartments, offices, schools and hospitals
• Overhead tank to tap distribution, and risers in multi-storey buildings
• Replacing rusted GI lines, using the same GI fittings
• Industrial process and chemical lines (SCH 80 and 120)

Don’t use it for:

• Hot water above 60°C: use CPVC for geysers and hot-water lines
• Compressed air or gas: uPVC can shatter if an air line fails
• Drainage and soil lines: use uPVC SWR pipe, or uPVC UDS pipe for underground drainage
• Borewells: use uPVC casing pipe to line the bore and uPVC column pipe to hang the submersible pump
• Long water mains and farm lines: HDPE pipe or HDPE sprinkler pipe is usually a better fit

ASTM pipes and fittings – jointing guide

ASTM pipes join in two ways: threaded pipes screw into GI or ASTM threaded fittings, and plain-end pipes are solvent-welded into ASTM D2467 socket fittings. Follow Duke’s jointing guidance for your project; the basics are below.

Threaded joint (BSP)

1. Check that the thread is clean and undamaged.
2. Seal the thread with PTFE (Teflon) tape. Avoid hemp, paint or sealing compounds that are not made for uPVC.
3. Tighten by hand, then lightly with a strap wrench. Don’t over-tighten; it can crack the fitting.

Solvent-weld joint (plain end)

1. Cut the pipe square, remove burrs and clean the pipe end and socket.
2. Apply a primer and solvent cement made for uPVC (ASTM F656 primer, ASTM D2564 cement).
3. Push the pipe fully into the socket and let the joint cure as the cement maker says before testing.

Always pressure-test with water, never with compressed air.

ASTM uPVC vs GI vs CPVC pipe

For cold drinking water, ASTM uPVC gives you GI-style threading without rust. CPVC is the right choice only when the line carries hot water.

Quality checks under ASTM D1785

ASTM D1785 doesn’t only fix sizes; it also sets the tests a pipe must pass. These are the main ones, and you can ask us for the test certificate for your lot.

ASTM pipe price & price list

ASTM pipe price depends on three things: size, schedule and quantity. SCH 40 costs less than SCH 80 or 120 because it uses less material. Prices also move with PVC resin rates, so we quote the day’s rate rather than printing a fixed list.

To get a price, send us four details: size, schedule, quantity and delivery city. We’ll reply with the rate and dispatch date. Dealers, contractors and project buyers get bulk rates.

Get today’s price on WhatsApp: +91 73920 73920 · Downloads

Buying for a project outside India?

ASTM is the pipe standard many Gulf and African projects specify, so ASTM schedule pipe fits directly into their drawings. Duke ASTM pipe is packed in 3 m or 6 m bundles. Send your bill of quantities (BOQ) through our contact page and we’ll come back with a quote.

Why buy from Duke Pipes

• Direct from the manufacturer since 1998: no trader margin, and you speak to the people who make the pipe. Read our story.
• National Quality Award, Government of India, 2007.
• All three schedules, full data published: SCH 40, 80 and 120, with wall thickness and pressure for every size.
• Trusted by builders, institutions and industry: see our clients.
• Delivery across India, including Gujarat, Rajasthan, Maharashtra and Delhi.
• Want to sell Duke pipes? Become a dealer or become a distributor.

Get a quote for ASTM plumbing pipe

Tell us the size, schedule, quantity and city. We’ll reply with today’s price and dispatch date.

WhatsApp +91 73920 73920 · Call 02742-280023 · Contact form

Duke Pipes Private Limited, Survey No. 365/1, At & Po Chadotar, Gadh Road, Ta. Palanpur, Dist. Banaskantha, Gujarat 385001 · Mon–Sat, 8:30 am – 6:00 pm

Manufacturer: Duke Pipes Private Limited · Product: ASTM uPVC Plumbing Pipe · Standard: ASTM D1785 · Made in: Palanpur, Gujarat, India · Prepared by: Duke Pipes technical team · Last updated: October 2026