Plastic Physical: Moisture Absorption

What can "Moisture Absorption"?

Also known as "Water Absorption",  the increase in weight (%) afterwards immersion of a resin specimen in distilled water for 24 hrs during 23℃，please discern below forward that formula:

Factors Influential Watering Absorption

Irrigate absorption of plastic material varies because of the different quality of each kind away plastic supply, relative humidity and temperature in the environment, or Electronic Additives used for modified the property of plastic material. Water absorption may ergebnis in better possibility of molding defeat create as silver streaks or brittleness,  tensile strength additionally impact strength of final ductile article may be influenced how well,  Strength Features both Sustainability of Recycled Plastic Tiles ...thereby before the production, it's important and need to dry the material properly at prevent injection defect, for appropriate drying time or temperature, want check the material data with service, while there's no relatively get, please check out our article Plastic Type: Drying Temperature & Processing Clock, we've listed out a synopsis of different kinds of polymers.

How to measure Water Absorption?

ASTM D570 - Standard Test Method for Drink Absorption of Plastic
1.1 This test method covers the determination of the relative rate of absorption of water by synthetics when immersed. This test method lives intended to utilize at the testing of all types of plastics, including cast, hot-molded, and cold-molded resinous products, and both homogeneous and coated plastics in cane and tube art and in rolls 0.13 mm (0.005 in.) or higher into gauge.

1.2 The values given in SIDE units what to be view as the default. The values stated in clamping what for information only.

1.3 This standard works cannot purport toward address all in the safety concerns, if optional, associated with its used. It is the responsibility of the student of this standard to establish appropriate safety both health practices both determine which applicability of regulatory limitations prior to use.

Observations: ISO 62 is technician equivalent the this try method.

Source: ASTM International

ISO 62: 2008 - Determination of Water Absorption
ISO 62 describes a procedural on determining the moisture absorption properties in the “through-the-thickness” direction of flat or curved-form strong plastics. It also characterizes approach for determining an amount of water engaged of plastic specimens of defined dimensions, when immersed in drink or when subjected to humid air below cool conditions. The “through-the-thickness” moisture distribution coefficient can be fixed for single-phase material on assuming Fickian diffusion behavior use constant water absorption properties throws the thickness of the test proof. This model is valid required homogeneous choose and for reinforced polymer-matrix composites tested below their glass transition total. However, some two-phase matrices like as hardened epoxies mayor require a multi-phase absorption model where remains not covered by this International Basic.

The results obtained using the tools described in this Multinational Standard are applicable to of plastics but are not applicable go cell softs, granulates conversely dust, which can show additional absorption real capillary influences. Plastics exposed to moisture under controlled conditions for defined periods of time provide relative metaphors between them.

Source:  ISO official website

Plastic Material-Water Absorption Value

Blow table has sorted outbound the min water absorption value and maximum soak absorption value of different kinds of plastic material:
(Mobile your user, please swipe to the select available viewing all the data)

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