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ASTM D1494-97

(Test Method)

Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics Panels

Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics Panels

SCOPE
1.1 This test method covers the determination of the diffuse light transmission factor of translucent reinforced plastics building panels.
1.2 The values stated in SI units are to be regarded as the standard. The values given in the parentheses are for information only.
1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in Tables and Figures) shall not be considered as requirements of this standard.
1.4 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.
Note 1—There are no ISO standards covering the subject matter of this specification.

General Information

Status
Historical
Publication Date
09-Apr-1997
Technical Committee
D20 - Plastics
Drafting Committee
D20.24 - Plastic Building Products
Current Stage
Ref Project

Relations

Replaced By
ASTM D1494-97(2001) - Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics Panels
Effective Date
10-Apr-1997
Referred By
ASTM D3841-21 - Standard Specification for Glass-Fiber-Reinforced Polyester Plastic Panels
Effective Date
10-Apr-1997
Referred By
ASTM E179-17(2022) - Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials
Effective Date
10-Apr-1997

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ASTM D1494-97 - Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics PanelsASTM D1494-97 - Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics Panels
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ASTM D1494-97 - Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics Panels
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Standards Content (Sample)


NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
An American National Standard
Designation: D 1494 – 97
Standard Test Method for
Diffuse Light Transmission Factor of Reinforced Plastics
Panels
This standard is issued under the fixed designation D 1494; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope * 4. Significance and Use
1.1 This test method covers the determination of the diffuse 4.1 The purpose of this test method is to obtain the diffuse
light transmission factor of translucent reinforced plastics light transmittance factor of both flat and corrugated translu-
building panels. cent building panels by the use of simple apparatus and by
1.2 The values stated in SI units are to be regarded as the employing as a light source a combination of fluorescent tubes
standard. The values given in the parentheses are for informa- whose energy distribution closely approximates CIE Source C.
tion only.
5. Apparatus
1.3 The text of this standard references notes and footnotes
which provide explanatory material. These notes and footnotes 5.1 The apparatus for this test method shall consist of a
transmissometer, Fig. 1, comprising essentially the following:
(excluding those in Tables and Figures) shall not be considered
as requirements of this standard. 5.1.1 Light Source—The illumination shall consist of
twelve 20-W fluorescent tubes which are assembled in three
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the banks of four tubes each, according to the following schedule:
daylight, deluxe cool white, blue, and daylight.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.1.2 Photometer—The photometer shall consist of a pho-
tocell and of a galvanometer. The photocell shall be of the
bility of regulatory limitations prior to use.
barrier-layer type and shall contain a visual correction filter.
NOTE 1—There are no ISO standards covering the subject matter of this
The assembly preferably should be hermetically sealed into
specification.
plastic as a protection against moisture. The indicating galva-
2. Referenced Documents nometer should contain one scale graduated from 0 to 100, and
a circuit with sufficient variable resistance so that the sensitiv-
2.1 ASTM Standards:
ity of the photometer can be adjusted over the range of 50 to
D 618 Practice for Conditioning Plastics and Electrical
100 footcandles.
Insulating Materials for Testing
5.1.3 Test Cabinet, constructed in accordance with the
D 883 Terminology Relating to Plastics
following dimensions.
D 1600 Terminology for Abbreviated Terms Relating to
5.1.3.1 The transmitted area of the test specimen shall be
Plastics
1 1
610 6 1.6 mm by 610 6 1.6 mm (24 6 ⁄16 in. by 24 6 ⁄16 in.).
E 691 Practice for Conducting an Interlaboratory Test Pro-
5.1.3.2 The distance from the bottom of the fluorescent
gram to Determine the Precision of Test Methods
tubes to the bottom of the test specimen shall be 203 6 0.8 mm
3. Terminology
(8 6 ⁄32 in.).
5.1.3.3 A 4.8-mm ( ⁄16-in.) thick, white, standard outdoor,
3.1 General—Definitions are in accordance with Terminol-
translucent diffusing plate shall be placed between the light
ogy D 883 and abbreviations with Terminology D 1600, unless
source and the test specimen so that the distance from the
otherwise indicated.
bottom of the diffusing plate to the bottom of the test specimen
1 5
This test method is under the jurisdiction of ASTM Committee D-20 on Plastics The SPI (Society of the Plastics Industry) transmissometer has been found
and is the direct responsibility of Subcommittee D20.24 on Plastic Building satisfactory for this purpose.
Products. General Electric fluorescent tubes have been found satisfactory for this purpose.
Current edition approved April 10, 1997. Published November 1997. Originally Detailed working drawings and a bill of materials for this equipment can be
published as D 1494 – 57 T. Last previous edition D 1494 – 92. obtained at a nominal charge from ASTM Headquarters, 100 Barr Harbor Drive, PO
Annual Book of ASTM Standards, Vol 08.01. Box C700, West Conshohocken, PA 19428–2959. Order Adjunct: ADJD1494.
3 8
Annual Book of ASTM Standards, Vol 08.04. Plexiglas II, W7328, or its equivalent, has been found satisfactory for this
Annual Book of ASTM Standards, Vol 08.03. purpose.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 1494
Metric Equivalents
in. mm in. mm in. mm in. mm
1 3 3 3
⁄32 0.8 ⁄4 19.1 8 ⁄4 222 24 ⁄4 634
3 1 3 1
⁄16 4.8 1 ⁄4 31.8 9 ⁄4 248 25 ⁄2 648
7 1
⁄37 5.6 1 ⁄2 38.1 12 305 28 711
1 1
⁄4 6.4 2 50.8 14 356 29 ⁄2 749
9 3 1
⁄32 7.1 6 ⁄4 172 24 610 38 ⁄2 978
⁄8 9.5
FIG. 1 Assembly Drawing of Transmissometer
1 1
is 31.8 6 0.8 mm (1 ⁄4 6 ⁄32 in.). equilibrium conditions. Adjust the galvanometer to read
5.1.3.4 The photocell shall be positioned below the center “100.’’ The instrument is now ready to be used for measure-
axis of the test specimen so that the distance from the bottom ments of diffuse light transmission factor.
of the specimen to the top of the cell is 283 6 0.8 mm (11 ⁄8 6
⁄32 in.).
7. Test Specimens
5.1.3.5 A masking plate containing a 31.8-mm (1 ⁄4-in.)
7.1 The test specimens shall consist of translucent rein-
diameter hole in its center shall be placed between the test
forced plastic panels having a minimum length of 610 mm (24
specimen and the photocell so that the distance from the
in.) and a width greater than 610 mm (24 in.), but not
bottom of the test specimen
...

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Note 1: The term carbon residue is used throughout this test method to designate the carbonaceous residue formed after evaporation and pyrolysis of a petroleum product under the conditions specified in this test method. The residue is not composed entirely of carbon, but is a coke which can be further changed by pyrolysis. The term carbon residue is continued in this test method only in deference to its wide common usage.
Note 2: Values obtained by this test method are not numerically the same as those obtained by Test Method D524. Approximate correlations have been derived (see Fig. X1.1), but need not apply to all materials which can be tested because the carbon residue test is applied to a wide variety of petroleum products.
Note 3: The test results are equivalent to Test Method D4530, (see Fig. X1.2).
Note 4: In diesel fuel, the presence of alkyl nitrates such as amyl nitrate, hexyl nitrate, or octyl nitrate causes a higher residue value than observed in untreated fuel, which can lead to erroneous conclusions as to the coke forming propensity of the fuel. The presence of alkyl nitrate in the fuel can be detected by Test Method D4046.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 WARNING—Mercury has been designated by many regulatory agencies as a hazardous substance that can cause serious medical issues. Mercury, or its vapor, has been demonstrated to be hazardous to health and corrosive to materials. Use caution when handling mercury and mercury-containing products. See the applicable product Safety Data Sheet (SDS) for additional information. The potential exists that selling mercury or mercury-containing products, or both, is prohibited by local or national law. Users must determine legality of sales in their location.  
1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Prin...

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