Dimensional Stability and Change Tests

Dimensional Stability and Change Tests

Dimensional change and stability test is a test method to check and determine whether industrial materials are capable of preserving original shape, length and width when exposed to heat, moisture, water and cleaning.

TS EN 2505 Residual stresses present in the extrusion of plastic pipe products can have long-term adverse effects on product performance. In particular, ESCR or environmental stress cracking is accelerated in high-strength pipes with internal stresses. Longitudinal Reversion Test is a method of determining internal stress levels in pipes.

It includes a method of applying liquid or air to determine the ability of thermoplastic tubes to retain their former state. In our laboratory, airborne method is applied. The change in length can be applied to all flat thermoplastic tubes with fixed cross-section, inner and outer walls. Thermoplastic pipes without flat walls cannot be applied. For pipes with wall thicknesses greater than 16 mm, it is not appropriate to measure the ratio at which the former can be taken.
A piece of pipe of a certain length is placed in an air-heated furnace. It is kept here for a certain time at a certain temperature. The length of the marked part of the pipe piece is measured under the same conditions before and after heating. Aging ability is the ratio of length to initial length. It is given as a percentage. After heating, the appearance of the surface of the test piece shall not change.

TS EN 15818 This test describes a procedure for determining the dimensional stability of polymer modified bituminous thick coatings at high temperature. After coating the substrate, the sample is delivered in a vertical position at a defined temperature over a period of at least 2 hours. After this time, a visual decision is made as to whether the coating has changed. It is a test method in which the extent of elongation or shortening behavior of the pipes in an oven in a certain period of time after being exposed to a certain temperature is analyzed.

A procedure for determining dimensional stability at high temperatures of polymer modified asphalt films is given. This test is intended for use in structures beneath the floor, for example when waterproofing is appropriate, ie it may have other uses in balconies or wet areas.

In our laboratories, below plastic and plastic pipe tests are performed.

Density Determination (TS EN ISO 1183)
Melt Flow Rate (MFR) determination (TS EN ISO 1133)
Elongation at Break (TS EN ISO 6259)
Hydrostatic Pressure Test (TS EN ISO 1167-1 / ISO 1167-2)
Pigment Dispersion (TS ISO 18553)
Release Strength (TS ISO 13953)
Internal Pressure Test After Compression (TS EN 12106)
Dimensional Stability Test under Temperature (TS EN ISO 2505)
Under Heat Behavior Test (TS ISO 12091)
Environmental External Impact Strength test (TS EN 744)
Ring Stiffness Test (TS EN ISO 9969)
Ring Flexibility Test (TS EN ISO 13968)
Temperature Impact Test (TS EN ISO 580)
Slow Crack Spread Resistance Test (TS EN ISO 13479)
Environmental Crack Advancement Test (ASTM D1693)
Plastics-Determination of Charpy Impact Properties (TS EN ISO 179)