Water Absorption of KYDEX® Thermoplastic Sheet
WATER ABSORPTION
PER ASTM D 570
(ISO 62)
Plastic materials absorb water. The slightest amount of moisture content may result in changes in dimensions or in properties such as electrical insulation resistance, dielectric losses, mechanical strength and appearance.
The determination of water absorption by a plastic specimen of defined dimensions is carried out by immersion in water for a specified time and at a specified temperature. The measured results are expressed in either milligrams absorbed water or as a percentage increase in weight. Comparison of the water absorption of various plastics is only possible if the test specimens are of identical dimensions and in the same physical state.
Test specimens are pre-dried at 55°C (122°F) for 24 hours, cooled to room temperature and weighed, before immersion in water for a specified time and at a specified temperature. Water absorption may be measured
- At 23°C (73°F): the specimens are placed in a container with distilled water at 23°C (73°F). After 24 hrs, the specimens are dried and weighed.
- At 100°C (212°F): the specimens are immersed for 30 minutes in boiling water, cooled for 15 minutes in water at 23°C (73°F) and reweighed.
- Until saturation: the specimens are immersed in water at 23°C (73°F) until full saturation is reached.
Water absorption may be expressed as:
- The mass of water absorbed
- The mass of water absorbed per unit of surface area
- A percentage of water absorbed with respect to the mass of the test specimen
WATER ABSORPTION OF KYDEX® SHEET
As opposed to hygroscopic materials such as ABS, PC, and fiberglass that readily absorbs water, KYDEX® sheet is very hygroscopic (very low water absorption). This is important when these materials are used in Radome applications, which protect enclosed antennas from the environment because the absorption of water can degrade the antenna’s performance by reducing the transparency to radio frequencies and by reducing mechanical properties.
Moisture Absorption
Because we cannot anticipate or control the many different conditions under which this information and our products may be used, we do not guarantee the applicability of the accuracy of this information or the suitability of our products in any given situation. Users should conduct their own tests to determine the suitability of each product for their particular purposes. Data in the physical property table represents typical values and are to serve only as a guide for engineering design. Results are obtained from specimens under ideal laboratory conditions. Right to change physical properties as a result of technical progress is reserved. THE PRODUCTS DISCUSSED ARE SOLD WITHOUT WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE, EITHER EXPRESSED OR IMPLIED, EXCEPT AS PROVIDED IN OUR STANDARD TERMS AND CONDITIONS OF SALE. Buyer assumes all responsibility for loss or damage arising from the handling and use of our products, whether done in accordance with directions or not. In no event shall the supplier or the manufacturer be liable for incidental or consequential damages. Also, statements concerning the possible use of our products are not intended as recommendations to use our products in the infringement of any patent. Consult local code and regulatory agencies for specific requirements regarding code compliance, transporting, processing, recycling and disposal of our product. Product not intended for use as a heat resistant surface. Texture, product grade and other conditions may cause variations in appearance.
This information supersedes all previously published data.