ASTM C319-55

Specification for 85 Percent Magnesia Block-Type Thermal Insulation (Withdrawn 1962)

General Information

• Status: Withdrawn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

Standards Content (Sample)

~O'rlCe: 'this mattt1rial lflay bG pl'Oieeied
by copyright law (Title 17, u.s. Code)
Standard Specifications for
85 PER CENT MAGNESIA BLOCK-TYPE THERMAL
1
INSULATION
•
ASTM Designation: C 319 - 55
2
ADOPTED, 1955.
This Standard of the American Society for Testing Materials is issued under ·
the fixed designation C 319; the final number indicates the year of original
· adoption as standard or, in the case. of revision, the year of last revision.
Scope tain not less than 85 per cent by weight
of hydrated basic magnesium·carbonate,
1. These specifications cover the
reinforced with mineral fiber.
composition, sizes, dimensions, and
chemical and physical properties of 85
Physical Requirements
per cent magnesia block-type thermal
4. The insulation shall conform to
insulation intended for use on surfaces
the following physical requirements:
operating at temperatures up to approx­
Density (average), max, lb per cu ft. . 14.0
imately 600 F. For specific applications,
Thermal conductivity (average), max,
the actual temperature limit shall be
Btu in. per hr sq ft deg Fahr: ·
agreed upon between the manufacturer At mean temperature of 200 F. . . . . . . 0 .46
At mean temperature of 300 F. . . . . . • 0. 50
and the purchaser.
At mean temperature of 400 F. 0.53
Compressive strength (average), at 10
Definitions
per cent deformation, min, psi . . . . . 50. 0
Flexural strength (average), min, psi. . . . a
· · 2. The Standard Definitions of Terms
Linear shrinkage (average), ·after heat
Relating to Thermal Insulating Ma­
soaking, max, per cent . _. 2.0
3
terials (ASTM De5ignation: C 168)
a The average flexural strength in pounds per
shall be considered as applying to the
square inch shall be numerically equal to three
terms used in these specifications.
times the density in pounds per cubic foot.
Chemical' Requirements
Standard Shapes, Sizes, and Dimensions
3. Eighty-five per cent magnesia
5. (a) Eighty-five per cent magnesia
block-type thermal insulation shall con-
block-type thermal insulation may be
supplied either fiat or curved.
1 Under the standardization procedure of the
Society these specifications are under the juris­ (b) Standard sizes of the insulation
diction of the ASTM Committee C-16 on Ther­
shall be as follows:
mal Insulating Materials.
(1) Flat Block.-Flat block shall
2 Prior to· adoption as standard, this method
was published as tentative from 1953 to 1955.
be furnished in a length of · 36 in.,
3 Appears in this publication, see Contents
a width· of 6 in., and in thicknesses of
in Numeric Sequence of ASTM Designatioll!'l at
from 1 tO 3 in.
front of book.
1012

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MAGNESIA BLOCK-TYPE THERMAL INSULATION (G319-55) 1013
(2) Curved Block.-Curved . block
Additional block may be selected at the
shall be furnished in a length of 36 in., discretion of the inspector, at the pur­
a width of approximately 6 in., and chaser's expense. When· a lot contains
curved to inside radii of over 16t in. material of more than one size, a repre­
Individual dimensions shall conform sentative choice of sizes and thicknesses
to those specified by the manufacturer. shall be included among the block
selected.
Dimensional Tolerances
(c) Sampling Small Lots.-Testing
6. The average measured length,
of small lots is at the discretion of the
width, and thickness of any individual
purchaser; however, one half the number
block shall not differ from the manu­
of block selected on larger lots will be
facturer's standard dimensions by more
sufficient to test for other requirements.
i·
t h an ±s m.
(d) I dentification.-Each block se­
lected shall be marked so that it can be
Workmanship
identified at any time.
7. Since several requirements for this
Methods of Test
material are not easily defined by a
numerical value but affect the workman­
9. The properties enumerated in these
ship of a finished job, the insulation shall
specifications shall be determined in ac­
not have visual defects that will ad­
cordance with the following methods:
versely affect the service quality. For
(a) Conditioning.-Preceding a test,
example, air holes, cracks, warpage, and
the test specimens shall be conditioned
bad ends, when excessive, shall be
by drying to constant weight in an
avoided.
oven at a temperature of 215 to 250 F.
(b) Chemical Analysis.-The hydrated
Sampling
basic magnesium carbonate content and
8. (a) From each shipment of the
mineral fiber content of the insulation
insulation, samples shall be selected by
shall be determined in accordance with
the purchaser or his authorized repre­
the method described in the Appendix.
sentative. The samples shall consist of
(c) Density.-Tentative Method of
full-size block selected at random so as
Test for Density of Preformed Block­
to be representative of the whole lot of
Type Thermal Insulation (ASTM Desig­
block from which they are selec
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