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12. What is Zeoform’s durability in water?

Tests were conducted following ISO 175 and ISO 178, using an Instron 4505 testing machine. Zeoform HD specimens were immersed in distilled water at 23°C. After 1, 2, 4, 8, 16, 24, 48, 96 and 168 hours, specimens were taken out of the water. Half of these specimens undergone flexural tests, the other half was dried at 23/50 till constant weight was achieved and tested afterwards. Figure 3 shows the dependency of the flexural modulus of the wet and dry specimens on the immersion time. It is clearly visible that the flexural modulus decreases very fast, after one day the minimum value of approximately 500 MPa is nearly reached, about one tenth of the starting value of 9400 MPa. Most interesting is that the dried specimens regain their old stiffness, independent of the immersion time. Deviations from this statement, visible in figure 3, are due to a high statistical bandwidth. Click here to see chart.


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