ASTM C203
Standard Test Methods for Breaking Load and Flexural Properties of Block-Type Thermal Insulation
What it measures
Bends a block of insulation until it breaks, reporting the breaking load and flexural strength.
Why it matters for a panel envelope
An insulation core that is also a structural web has to resist bending, not just conduct little heat. This is the test for that property.
Guardian Shield™
Cited in the Shield™ specification's reference standards for the EPS core.
Source · 3-Part Specification, 1.3 F.7 · Guardian documents
Written by Data Subsystems, for Guardian Structural Technologies. Last updated .
Drafted from Guardian Structural product literature and published building-science sources. Awaiting Guardian technical review. Confirm any figure against the current product documents or ask us before you rely on it in a design.