Underwater Weighing Jig for ASTM D2842-19 & ISO 2896

Establishes a comprehensive procedure for determining the water absorption of rigid cellular plastics. This standard provides a consistent means of measuring the change in buoyant force of a plastic specimen after immersion under a specific head of water for a defined period. Developed by ASTM International, the test method is recognized for use in product specifications, quality control, and comparative product evaluation by standardizing the method for measuring water absorption, ASTM D2842-19 enables manufacturers, engineers, and end-users to reliably compare different cellular plastic products for use in environments where contact with water or moisture is a concern.

• Purpose and Scope: This test method is designed to compare the relative tendency of various rigid cellular plastics (such as foams and insulation boards) to absorb water when exposed to direct contact under specified conditions.

• Test Procedures: Two distinct procedures, A and B, are described:
  • Procedure A is used for cellular plastics that absorb water rapidly or increase in volume when wetted.
  • Procedure B applies to materials without rapid absorption or significant volume change.

• Test Conditions:
  • Immersion under a 5.1-cm (2-in.) head of water
  • Duration of 96 hours (other periods may be specified by agreement)
  • Measurement of volume change and dry/wet weight

• Specifications
• 6 1/2″ x 6 1/2″ x 6 1/2″ ID
• 5.5 lbs gross weight
• 165 mm x 165 mm x 165mm ID
• 2.5 kg gross weight