ASTM D4226 is a standard test method for impact resistance of rigid polyvinyl chloride (pvc) building products. This test assesses the energy required for rigid plastic sheeting and profile plane parts used in construction products as well as extruded or molded test samples, the free-falling standard weight of the impact impactor under specific impact conditions, with either of two configurations in contact with the specimen. The equipment used for this impact resistance test method is the same as that used for ASTM D2794 and ASTM D5420.

ASTM D4226-0 Standard Test Method for Impact Resistance of Rigid Polyethylene (Vinyl Chloride)(PVC) Building Products

Impact resistance of rigid polymer building products

There are two different procedures in ASTM D4226: Procedure A and B. Procedure A is used to determine the minimum impact energy required to cause damage in the form of holes, cracks, cracks, crushing or tearing. It determined the height at which a standard drop in weight of 8 pounds (3,6 kg) would cause 50% of the specimen to fail. The minimum impact energy required to cause brittle failure can be measured by procedure B. The procedure determined the height at which a standard drop of 8 pounds of weight would cause 50% of the sample to fail in brittle mode. The constant weight and variable height used in these test methods allow the impact velocity to vary, and in this way, through process B, the energy of the tough-brittle transition can be determined. It is impossible to drop a variable weight from a constant height.

These test procedures have been found to be useful for compound identification, finished product quality control, environmental and weather resistance studies and development studies, and manufacturing tolerance prediction.

ASTM D4226-0 Standard Test Method for Impact Resistance of Rigid Polyethylene (Vinyl Chloride)(PVC) Building Products

Typical test parameters for ASTM D4226

Sample/Product quantity: When the approximate average failure height of a given sample is known, 20 samples are usually required. If this height cannot be approximated, six or more samples should be added to determine the appropriate starting point for the test.

Sample size: at least 0.75 inches (19 mm) wide

Impact head configuration: Conical impactor C.125 (to ensure thicker specimens) or H.25 impactor