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ASTM C 1303 Document Information:
Title
Standard Test Method for Predicting Long-Term Thermal Resistance of Closed-Cell Foam Insulation
ASTM International
Publication Date:
Feb 15, 2007
Scope:
This test method covers a procedure for predicting the long-term
thermal resistance (LTTR) of unfaced or permeably faced rigid
gas-filled closed-cell foam insulations by reducing the specimen
thickness to accelerate aging under controlled laboratory
conditions (1-5) .2
Rigid gas-filled closed-cell foam insulation includes all
cellular plastic insulations manufactured with the intent to retain
a blowing agent other than air.
This test method is limited to unfaced or permeably faced,
homogeneous materials. This method is applied to a wide range of
rigid closed-cell foam insulation types, including but not limited
to: extruded polystyrene, polyurethane, polyisocyanurate, and
phenolic. This test method does not apply to impermeably faced
rigid closed-cell foams or to rigid closedcell bun stock foams.
NOTE 1—See Note 5 for more details regarding the applicability
of this test method to rigid closed-cell bun stock foams.
This test method utilizes referenced standard test procedures
for measuring thermal resistance. Periodic measurements are
performed on specimens to observe the effects of aging. Specimens
of reduced thickness (that is, thin slices) are used to shorten the
time required for these observations. The results of these
measurements are used to predict the long-term thermal resistance
of the material.
The test method is given in two parts. The Prescriptive Method
in Part A provides long-term thermal resistance values on a
consistent basis that can be used for a variety of purposes,
including product evaluation, specifications, or product
comparisons. The Research Method in part B provides a general
relationship between thermal conductivity, age, and product
thickness.
To use the Prescriptive Method, the date of manufacture must be
known, which usually involves the cooperation of the
manufacturer.
The values stated in SI units are to be regarded as the
standard. The inch-pound values given in parentheses are for
information only.
This standard does not purport to address all of the safety
concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Table of Contents:
2 The boldface numbers in parentheses refer to the
list of references at the end of this standard.
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