ASTM C343-56

Specification for Cellular Glass Insulating Block (Withdrawn 1965)

General Information

• Status: Withdrawn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

Standards Content (Sample)

Standard Specifications for
1
CELLULAR GLASS INSULATING BLOCK
ASTM Designation: C 343 - 56
ADOPTED, 1956.2
This Standard of the American Society for Testing Materials is issued under
the fixed designation C 343; the final number indicates the year of original
adoption as standard or, in the case of revision, the year of last revision.
Scope ct!lls. These materiais shall be cellulated,
annealed, and trimmed into blocks of
1. Thes'e specifications cover the com­
standard dimensions ·of commercial
position, sizes, dimensions, and physical
sizes.
properties of cellular glass block in­
tended for thermal insulation, for. use
Physical Requirements
on surfaces operating at temperatures
4. The insulation shall conform to the
between -300 and +soo F. For specific
following physical requirements:
applications, the actual temperature
Density (average), lb per cu ft . .
limit shall ·be agreed upon between the 8 to 10
Thermal conductivity (average),
manufacturer and the purchaser.
max, Btu in. per hr sq ft deg
Fahr:
Definitions
At mean temperature of 0 . .
0.35
At mean temperature of 50 . .
0.38
2. The Standard Definitions of Terms
At mean temperature of 300 . .
0.55
Relating to Thermal Insulating Ma­ Flexural strength (averai:e), min, psi
75.00
8 Compressive strength (average),
terials (ASTM Designation: C 168)
min, psi. . .
100.00
shall be considered as applying to the
Water absorption (average), max,
terins used in these specifications. per cent by volume . .
0.2
Standard Dimensions
Composition and Manufacture
5. The dimensions of standard block
3. Cellular glass insulating block
shall be as follows:
shall consist of true glass compositions of
Widths, in •.
6 and 12
high durability, processed by fusion,
Length, in . .
18
comprising a homogeneous rigid cel­
Thicknesses, in . .
1~. 2. 2~. 3, 4,
lulated mass of hermetically sealed
and 5
Dimensional Tolerances
1 Under the standardization procedure of the
Society, these specifications are under the juris­
6. The average measured length,
diction of the ASTM Committee C-16 on Ther­
mal Insulating Materials. width, and thickness shall not differ
' Prior \o adoption llB standard, these specifi­
from the standard dimensions by more
cations were published as tentative from 1954 to
than ±>16 in. The blocks shall not be
1956.
3 1961 Book of ASTM Standards, Part 5.
out of square more than >ls in. per ft.
322

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SPECIFICATIONS FOR CELLULAR GLASS INSULATING BLOCK (C 343 - 56) 323
Workmanship determined in accordance with the test
methods, and with the number of test
7. Since several requirements for this
specimens, prescribed in the Methods
material are not easily defined by a
of Testing Cellular Glass Insulating
numerical value, but affect the work­
4
Block (ASTM Designation: C 240
...