Durastream CPVC Impact Strength

What Is Impact Strength?

In short, impact strength is a material’s ability to withstand a sudden load applied to it without fracturing. People measure it in terms of how much energy the material absorbs before fracture.

Why Is Impact Strength Important for CPVC?

First, high impact strength helps a product avoid damage and breakage from external and internal impact.

In the CPVC piping system, impact strength is a reliable benchmark to determine key factors:

  • Superior product performance
  • Longer service life
  • Low risk of damage during transportation and after installation

The chart below shows the typical impact strength for each plastic type per compound formulations. Durastream CPVC impact strength is reliable and durable. Moreover, we can increase impact strength using SEKISUI CPVC compound formulation technology.

Test Method: ASTM D256

Unit: ft・lb/in

How Do You Test Impact Strength?

In sum, impact strength is a material’s ability to withstand a suddenly applied mechanical load. Interestingly, impact strength tests commonly use the Charpy and the IZOD specimen configuration.

The main differences between the IZOD and Charpy impact tests are the position of the specimen and the type of notches.

Here’s how the tests differ.

First, set the sample under the machine and rotate the hammer to the swing position:

  • In the IZOD test, position the specimen vertically, with the notch facing the hammer.
  • In the Charpy test, position the specimen horizontally, with the notch facing away from the hammer.

In North America, CPVC pipe and fitting applications typically undergo the IZOD test method.

Test piece illustration
Izod impact test illustration

Drop Impact Strength

What is drop impact strength? Essentially, drop impact strength measures a material’s ability to withstand external damage, such as damage during transportation or from falling or dropping at a jobsite.

High Drop Impact Strength (Pipe Property)

Durastream has high impact resistance. Its performance doesn’t decrease, even with long-term use at high temperatures. Please contact us for more information!

Test Conditions

Evaluation after immersing the sample in hot water at 82°C (179°F)

  • Weight:1 kg (2.205 lbs.)
  • 50% failure drop height
  • N = 10 pieces
Weight: 1kg, @0deg-C - 50% brake height

Video Demonstration