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Flattening Test for Extruded uPVC Pipes

When you test by the given method, the specimen shall be free from any Cracks and Crazing.

First of all you must get 50mm length of specimen from the pipe. Then hold it between the two plates of smooth surface and compress under a losd at the rate of 10mm per minute until the outside diameter of of the test specimen is depress to half the original diameter. Specially you can use Tensile strength Measuring Test Machine with special plates to supply that load.

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Longitudinal Reversion Test ( For Extruded uPVC Pipes )

Introduction

When you test by the given method, approximately 300mm length of pipe shall not alter in length by more than 5%.

Test Sample

• After extrude the pipe you must keep the pipe at 23±2 °C for at least 2 hours.
• Then you can get a 300±20mm length of sample from above pipe.
• Then you must trace (mark) two circumferential marks apart 100mm (L0) on the test specimen (One of the marks must be at least 10mm from one end of the sample).
• Repeat above trace three times at the same sample as given image.
• After that, drill or cut two holes at least 15mm from other end of sample to insert Metal Wire ( Two holes must be on diameter and parallel  to mouth of pipe).

Preparing Apparatus

The apparatus shall consist of Thermostatically Controlled bath at 150±2°C. And it shall be made for effective agitation to ensure that the temperature tolerance is maintained throughout the heating medium. You can use Glycerine, Glycol, Silicone Oil, Vaseline Oil ( Free from aromatic hydrocarbons ) or a solution of calcium chloride.

When you choose the heat transfer medium, it must be stable at the temperatures required and it does not affect the sample.

Procedure

• First of all you must measure the two marks to within 0.2mm ( Using vernier Caliper ) at 23±2 °C.
• Then control the temperature of the heating medium at 150±2 °C.
• Then suspend the test piece vertically using inserted metal wire in the heating medium by the end furthest from the marks, so that immersed portion of the test piece is at least 20mm long.
• Make sure the sample is not touch wall or base of the bath.
• After that  leave the test piece immersed for,

15min

for pipes of maximum specified thickness equal to less than 8mm.

30min

for pipes of maximum specified thickness more than 8mm.

• After that remove the test piece from the bath and suspend them vertically.
• Then allow them to cool by exposure to the air at 23±2 °C.
• After complete cooling, get four measures of the distance between the marks at 23±2 °C within 0.2mm.

Test Results

For each distance between two marks, calculate the Longitudinal reversion as a percentage by following the formula.

Lo is the distance between the marks in millimeters before test.
L is the distance between the marks in millimeters after the test.

Choose the measurement of  L which gives the greatest value of |ΔL| where ΔL could be positive or negative.

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Test for Resistance to Acetone ( For Extruded Pipes )

Procedure

1. First of all you must get 25mm length sample of pipe.
2. Then clean the surface of sample using cotton waste or any thing like that.
3. Then get a beaker and put the sample into the beaker.
4. Then fill the Analytical Reagent Acetone up to sample level ( add acetone at room temperature ).
5. After 2 hours you can note the effect of Acetone on the pipe surface.

When you test by the given method, pipe shall not show Delamination or Disintegration. Flattening  or Swelling of the pipe is not to deem as a contribute failure.

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Determination of Effect of Material on Water Quality ( Method of Extraction )

Test Specimen

You must get three test specimens of pipe. Each test specimen must taken from different pipes randomly. Each test specimen must contain approximately 500mm in length.

Procedure

• First of all you must wash every test specimen using tap water for a period of 6 hours. 
• The pH value of water must be 7-8. 
• Fit a stopper at one end of the each test specimen. 
• Each stopper must contain with a Glass Stop-cock. 
• Then stand the specimen in a vertical position and stop-cock at the bottom opened to give  the desired flow of the water through the specimen. 
• Make sure stoppers and other materials used for sealing are not contain materials which may cause contamination. 
• The water shall be passed through the specimen at approximately 50mm/s. 
• Because the specimen must kept fully filled with water. 
• You must add sufficient water to overflow at all times.

• After washing, you must fill each specimen with the fresh solution of the distilled water acidified to a pH value of  4.5 - 4.6 by bubbling a current of CO2 through it. 
• To fill that solution seal a one end with a material that doesn't contain any toxic substances. 
• After fill the solution, seal other end using above material.

• After that you have to maintaining the specimen at room temperature for 48 hours.
• The solution should decant into a suitable container for analysis as the First Extraction.
• Then you must repeat the procedure for second and third time.
• Then retain these sample for the determinations of the amounts of metal and other toxic substances as second and third extractions.

After all of that you can analyse First and Third Extraction for Lead.

And also you can analyse The Third Extraction for Dialkyl Tin as Tin ( C4 and above ).

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