Available Plastics, Inc. (API) - Leading PVC and Plastic Pipe Manufacturer
Stock Tooling to run over 10,000 Sizes
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Pipe, Tube & Profile ExtrusionCustom PVC Pipe & TubeCustom Extrusion ProfilesFurniture Grade PVC Pipe and TubeIndustry Standard PVC Pipe & Tube
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Industry Standard PVC Pipes & Tubes

Available Plastics can produce your rigid PVC plastic pipe and tube to the following standards:
  • SCH-40
  • SCH-80
  • SDR 17
  • SDR 21
  • SDR26
  • SDR 32.5
  • SDR 41

Plus many other ASTM and industry specifications. Because of the wide range of pipe and tube we make, most of our product is produced to order and not stocked. Our turnaround time is very fast!

 Pipe Wall Thickness Tolerance Specifications   Pipe Dimension Specifications   Pipe Outside Diameter Tolerances & Ovality Specifications   Pipe & Tube Nomenclature   


OD is the abbreviation for the "Outside Diameter". It is the measurement of maximum outside to outside measurement across the outside of a pipe or tube.


ID is the abbreviation for the "Inside Diameter" It is the measurement of maximum inside to inside measurement across the inside of a pipe or tube.


No pipe or tube is truly perfectly round. Ovality is used to quantify how out of round (or squished) a pipe or tube is. Ovality is simply the difference between the widest outside diameter (OD) you can measure on a piece of pipe or tube minus the smallest outside diameter (OD) you can measure on the same piece of pipe or tube. For example, a tube could have an average outside diameter of 4.00 inches but it could have a maximum OD measurement of 4.015" at one point and minimum OD measurement of 3.985" at another point. Its Ovality would be .030", which is the maximum OD - Minimum OD or 4.015" - 3.985" = .030" Ovality.


SDR is an abbreviation for "Standard Dimension Ratio". It is a convenient means for defining the minimum wall thickness for Pipe (not Tube). It is equal to the Actual Pipe Diameter (not the nominal pipe size) divided by the wall thickness. For example 2" pipe, which has an actual OD of 2.375" with a wall thickness of .091", would have an SDR value of 2.375" / .091" or an SDR of 26. In the reverse, by knowing the pipe size and SDR number, you can calculate the minimum wall thickness. For example 3" SDR 21 pipe which has an actual OD of 3.500" would have a minimum wall thickness equal to 3.500" / 21 or .165". It is important to note the wall calculated is the minimum wall thickness. In the case of the 3" SDR 21 pipe, we would actually extrude the wall at .177" with a tolerance of plus or minus (+/-) .012". This would mean that the walls could run in spec from a maximum of .177" + .012" or.189" to a minimum .177" - .012" or .165" which is the number as calculated by the SDR ratio.

Schedule or Sch.

The "Schedule" designation is an industry standard classification that basically tells you how thick the wall is for any size of pipe. The most common Schedules are Sch 40 and Sch 80. The higher the Schedule number the thicker the wall is with Sch 40 being the thinner and Sch 80 being the thicker. For example 2" pipe all has an Outside Diameter of 2.375" but Schedule 40 has a wall thickness of .154" and 2" Schedule 80 has a wall thickness of .218". Also note that a Schedule 40 wall thickness is different for every different size of pipe. For example, a 2" Schedule 40 pipe does not have the same wall thickness as a 3" pipe Schedule 40 pipe. The 2" Schedule 40 has a wall thickness of .154 but the 3" Schedule 40 has a .216" thickness.

Difference Between Pipe and Tube

The terms "Pipe" and "Tube" are used interchangeably every day - even by the experts - but they are different. "Tubes" are the most straight forward in that the outside diameter of say a 2" "Tube" is truly 2.00". "Pipe" on the other hand was originally designed to carry water on it's inside so a 2" Pipe roughly references the inside diameter of the pipe - not the outside diameter. A 2" Schedule 40 pipe has an OD of 2.375" (not 2"), a wall thickness of .154" and an inner diameter of 2.067" (2.375" OD - 2 x .154" (the wall thickness)). It gets worse. Water pipes are run at different thicknesses - usually to handle different pressures. In contrast to the 2" Schedule 40 pipe above, a 2" Schedule 80 pipe has the same OD of 2.375" but a wall thickness of .218". This gives it an inner diameter of 1.939" (2.375" OD - 2 x .218" (the wall thickness)). This means that a 2" Schedule 80 pipe has a smaller ID, less than 2". Why wouldn't they keep the same Inside Diameter (ID) and just make the outside Diameter larger if they needed heavier walls? By keeping the Outside Diameters the same, a 2'' fitting that goes over the OD of the pipe will work for 2" pipe, regardless of the wall thickness.

Furniture Pipe

Furniture Pipe is specialty composite pipe that is custom extruded using two different types of PVC’s that are fused together under the extreme heat and pressure of the extrusion process. The inside or core PVC material is a very strong industrial grade of PVC with the top layer acting much like the protective enamel on a tooth. This outer layer is an extremely expensive, highly pigmented, glossy, weatherable cap that is extremely resistant to damage and degradation by sunlight. Furniture Grade Pipe made with this process provides a superior, cost effective product. If we used that top layer material throughout the entire pipe, it would be much more expensive while compromising some of the strength properties of the pipe. This construction of pipe is also known as Co-extrusion and Capstock.