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ASTM D570 Standard Test Method for Water Absorption of Plastics
Last updated February 8, 2026
ASTM D570 Standard Test Method for Water Absorption of Plastics
ASTM D570 is a normal test procedure that identifies the water absorption properties of plastics under certain set conditions. It includes placing plastic samples in water during a specified time, after which weight changes and ultimately the percentage of water absorbed are obtained. The testing is helpful in the evaluation of the behaviour of materials in wet environments, and the assessment of dimensional stability, mechanical integrity, and reliability of a product. The test is mostly applied to quality control, research, and material comparison in the production of plastics. The standard has given specific guidelines on how to prepare the specimen and the time taken to immerse the sample, calculation of results, etc., to make them consistent in different materials.
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ASTM D570 Introduction
ASTM D570 is a laboratory standard that specifies a consistent laboratory procedure used to establish the water absorption properties of plastic materials under conditions of controlled conditions. The absorption of moisture has a direct effect on mechanical strength, dimensional stability, electrical insulation, and long-term performance of plastics in industrial and structural use. This test is used by manufacturers, researchers, and research laboratories to test the suitability of materials under either humid or water-exposed environments. The method can be used to compare materials, develop products, and meet engineering requirements by measuring the change in weight following immersion. ASTM D570 exhibits an important role in inhibiting early degradation of the plastic parts that are used in the packaging, automotive parts, electrical enclosures, and building products that require moisture resistance as a guarantee of reliability and service life.
Get Certified ASTM D570 Testing for Uncompromising Quality and Project Success
ASTM D570 certification ensures that testing is in accordance with internationally recognized testing procedures and quality standards. Certified testing instills trust in the performance of the material and enhances regulatory and client acceptance. ASTM D570 certified laboratories guarantee repeatability, accuracy, and traceability in industrial decision-making.
Specimens are immersed in distilled water at 23°C for 24 hours or as otherwise specified.
Weight Measurement
Samples are weighed before immersion and again after removal and drying with a lint-free cloth.
Water Absorption Calculation
The percentage of water absorbed is calculated using the formula: ((Wet weight – Dry weight) / Dry weight) × 100.
Scope of ASTM D570
ASTM D570 determines the behavior of rigid and semi-rigid plastic materials when exposed to water.
The standard helps in the comparison between various polymer formulations.
The technique helps in modeling dimensional and mechanical changes on the basis of moisture.
ASTM D570 Equipment and Sample Preparation
Immersion Duration
Specimens are immersed in distilled water at 23°C for 24 hours or as otherwise specified.
Weight Measurement
Samples are weighed before immersion and again after removal and drying with a lint-free cloth.
Water Absorption Calculation
The percentage of water absorbed is calculated using the formula: ((Wet weight – Dry weight) / Dry weight) × 100.
Use of ASTM D570
ASTM D570 is a technique used by manufacturers to choose plastics as moisture-sensitive materials.
Quality control teams use this test to ensure batch consistency.
The method is employed by researchers to investigate the moisture interaction and structure of polymers.
Common Challenges and Troubleshooting in ASTM D570
The varied sample thickness causes variation in sample absorption. Misuse of drying results in wrongful baseline weights. Any change in temperature during the period of immersion changes water uptake rates. Most of the accuracy problems can be solved by strictly controlling sample preparation, conditioning, and the testing environment.
ASTM D570 Process and Data Collection of Aggregate Testing Technique
It starts with the drying of specimens to a constant mass and then immersion of the specimen under controlled conditions in water. Technicians take samples at certain intervals, clean surface moisture, and note weight changes. The element of data collection is the percentage change in weight as compared to the initial dry mass.
ASTM D570 Results and Interpretation
An increase in the values of water absorption means that water becomes more hydrophilic and less dimensionally stable. The reduction in the absorption values indicates enhanced resistance to moisture and applicability in wet conditions. The engineers make comparisons of results with design limits and material specifications to assist in the selection of products.
Problem & The Solution of ASTM D570
Swelling, loss of strength, and electrical failure are caused by excessive absorption of water. ASTM D570 is used to detect weak materials at an early stage. Manufacturers address these concerns through either polymer blend modification or the use of protective coats.
Consideration To Test For ASTM D570
Speed
Fast turnaround testing helps in supporting production timelines and fast qualification of materials.
Expert
Professional technicians guarantee high precision of handling, accuracy of measurements and proper interpretation.
Cost
ASTM D570 testing is cost-effective to stop the failure of the material and a later expensive redesign.