ASTM C272
Standard Test Method for Water Absorption of Core Materials for Structural Sandwich Constructions
What it measures
Immerses a sandwich core and measures how much water it takes up over time.
Why it matters for a panel envelope
A wet core loses R-value and can lose strength. For a panel that lives in a wall for decades, low absorption is what keeps the published performance real.
Guardian Shield™
Cited in the Shield™ specification's reference standards. Guardian states the panels are moisture and mold resistant and do not decay, expand or warp.
Source · 3-Part Specification, 1.3 F.8; Differentiation sheet · 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.