General description of the test

Samples of the URETEK expanded material were subjected to immersion in various liquids and to cycles of thermal stress. After the test, variations in volume were measured by means of a high precision optical measuring instrument, and the degree of liquid absorption through variations in flow thrust examined

There were 10 cycles, each consisting of the following:

Test of Immersion in Liquids

The samples were completely immersed in various liquids at a temperature of 23 degrees C for 14 days. The liquids used were:

Two of the samples already subjected to thermal stress were also subjected to this test by immersion in high octane gasoline.

Water Absorption Test

The samples were immersed in 1.25m of water at 20 degrees C for 7 days to determine absorption through Percentage variations in heir flow thrust. The test included samples which had been subjected to the two previous tests.

Conclusions

The 10 cycles of thermal stress described above have left no visible trace on the material, and its dimensions have shown no measurable variation. The material is impermeable to water even after various immersions, and almost completely impermeable to the other liquids used in the tests. Thermal stress has had the effect of reducing its total liquid content, probably because of evaporation occurring during the periods of high temperature.