ASTM C381-58

Specification for Cellular Glass Thermal Insulation for Pipes (Withdrawn 1964)

General Information

• Status: Withdrawn
• Technical Committee: C16 - Thermal Insulation

Standards Content (Sample)

'40TICE: This material may be protected
ny coovright law (Title 17, U.S. Code)
Standard Specifications for
1
CELLULAR GLASS THERMAL INSULATION FOR PIPES
••••
ASTM Designation: C 381 - 58
ADOPTED, 1958.2
This Standard of the American Society for Testing Materials is issued under
the fixed designation C 381; the final number indicates the year of original
adoption as standard or, in the case of revision, the year of last revision.
Scope
sitions of high durability, processed by
fusion, comprising a homogenous rigid
1. These specifications cover the com­
cellulated mass of hermetically sealed
position, sizes, dimensions, and physical
cells:
properties of cellular glass intended for
thermal pipe insulation, for use on sur­
Physical Requirements
faces operating at temperatures between
-300 and +800 F. For specific applica­
4. The insulation shall conform to the
tions, the actual temperature limits shall
following physical requirements:
be agreed upon between the manu­
Density (average), lb per cu ft. . . . . . 8 to 10
facturer and the purchaser.
Thermal conductivity (average), max,
Btu in. per hr sq ft deg Fahr:
Definitions
At mean temperature of 0 F . .
0.35
At mean temperature of 70 F . .
0.39
2. The Definitions of Terms Relating
At mean temperature of 100 F . . 0.41
to Th~rmal Insulating Materials (ASTM
At mean temperature of 300 F . .
0.55
3
Designation: C 168) shall be considered
as applying to the terms used in these
Sizes and Dimensions
speci:fica tions.
5. (a) Cellular glass pipe insulation
shall be furnished in 18-in. lengths to fit
Materials and Manufacture
all sizes of pipe and tubing l in. nominal
3. Cellular glass thermal insulation for
diameter and larger.
pipes shall be fabricated from standard
(b) Each section shall be true to shape
cellular glass insulating block. The
and roundness and shall be fabricated to
block shall consist of true glass compo-
fit all nominal size pipe and standard
1 Under the standardization procedure of the
tubing. The outside diameter of the
Society, these specifications are under the juris­
insulation shall be fabricated in ac­
diction of the ASTM Committee C-16 on Ther­
mal Insulating Materials.
cordance with recommended dimensional
2
Prior to adoption as standard, these specifi­
standards practice.
cations were published as tentative from 1956
(c) The length of the segments shall
to 1958.
3
Appears in this publication, see Contents
have a tolerance of -f: l in. of the
6
in Numeric Sequence of ASTM Designations at
specified length. The wall thickness
front of book.
725

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726 SPECIFICATIONS FOR CELLULAR GLASS PIPE INSULATION (C 381- 58)
tolerance shall not exceed ±n in. of Methods of Test
that specified by the manufacturer· for
8. (a) Properties, other than density
any given size and class of cellular glass
and thermal conductivity, may be de­
covering.
termined on cellular glass block con­
forming to the Specifications for Cellular
Workmanship and Finish
Glass Insulating Block (ASTM Designa­
3
6. (a) Since several requirements for
tion: C 343) of the same lot from which
this material are not easily defined by a
the pipe covering was fabricated, in ac­
numerical value, but affect the workman­
cordance with the test methods and with
ship of a finished job, the insulation shall
...