ASTM D1494-97(2001)

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
• ICS: 83.120 - Reinforced plastics
• ICS: 83.140.10 - Films and sheets
• Technical Committee: D20 - Plastics
• Drafting Committee: D20.24 - Plastic Building Products

Relations

• Replaces: ASTM D1494-97 - Standard Test Method for Diffuse Light Transmission Factor of Reinforced Plastics Panels
• Effective Date: 10-Apr-1997
• Replaced By: ASTM D1494-97(2001)e1 - 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

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation:D 1494–97 (Reapproved 2001)
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.
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
5.1 The apparatus for this test method shall consist of a
which provide explanatory material. These notes and footnotes
(excluding those inTables and Figures) shall not be considered transmissometer, Fig. 1, comprising essentially the following:
5.1.1 Light Source—The illumination shall consist of
as requirements of this standard.
1.4 This standard does not purport to address all of the twelve 20-W fluorescent tubes which are assembled in three
banks of four tubes each, according to the following schedule:
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- daylight, deluxe cool white, blue, and daylight.
5.1.2 Photometer—The photometer shall consist of a pho-
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. tocell and of a galvanometer. The photocell shall be of the
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:
2 ity of the photometer can be adjusted over the range of 50 to
D 618 Practice for Conditioning Plastics for Testing
100 footcandles.
D 883 Terminology Relating to Plastics
5.1.3 Test Cabinet, constructed in accordance with the
D 1600 Terminology for Abbreviated Terms Relating to
following dimensions.
Plastics
5.1.3.1 The transmitted area of the test specimen shall be
E 691 Practice for Conducting an Interlaboratory Study
1 1
610 6 1.6 mm by 610 6 1.6 mm (24 6 ⁄16 in. by 24 6 ⁄16
Program to Determine the Precision of a Test Method
in.).
3. Terminology
5.1.3.2 The distance from the bottom of the fluorescent
tubes to the bottom of the test specimen shall be 203 6 0.8 mm
3.1 General—Definitions are in accordance with Terminol-
(8 6 ⁄32 in.).
ogy D 883 and abbreviations with Terminology D 1600, unless
otherwise indicated.
This test method is under the jurisdiction ofASTM Committee D20 on Plastics
and is the direct responsibility of Subcommittee D20.24 on Plastic Building
Products. The SPI (Society of the Plastics Industry) transmissometer has been found
Current edition approved April 10, 1997. Published November 1997. Originally satisfactory for this purpose.
published as D 1494 – 57 T. Last previous edition D 1494 – 92. GeneralElectricfluorescenttubeshavebeenfoundsatisfactoryforthispurpose.
2 7
Annual Book of ASTM Standards, Vol 08.01. Detailed working drawings and a bill of materials for this equipment can be
Annual Book of ASTM Standards, Vol 08.04. obtained at a nominal charge fromASTM Headquarters, 100 Barr Harbor Drive, PO
Annual Book of ASTM Standards, Vol 08.03. Box C700, West Conshohocken, PA 19428–2959. Order Adjunct: ADJD1494.
*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 1494–97 (2001)
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
5.1.3.3 A 4.8-mm ( ⁄16-in.) thick, white, standard outdoor, 6. Standardization of Transmissometer
translucent diffusing plate shall be placed between the light
6.1 Center the photocell beneath the 31.8-mm (1 ⁄4-in.)
source and the test specimen so that the distance from the
diameter hole in the bottom masking plate. Place the galva-
bottom of the diffusing plate to the bottom of the test specimen
nometer in a flat level position. Ensure that no current flows in
1 1
is 31.8 6 0.8 mm (1 ⁄4 6 ⁄32 in.).
the electrical circuit by opening the circuit.Adjust the position
5.1.3.4 The photocell shall be positioned below the center
of the indicating needle on the galvanometer to read “0’’ by
axis of the test specimen so that the distance from the bottom
means of the zero adjustment knob. Close the galvanometer
of the specimen to the top of the cell is 283 6 0.8 mm (11 ⁄8
circuit. Turn on the illumination in the transmissometer. Wait a
6 ⁄32 in.).
minimum of 20 min to permit the transmissometer to reach
5.1.3.5 A masking plate containing a 31.8-mm (1 ⁄4-in.) equilibrium conditions. Adjust the galvanometer to read
diameter hole in its center shall be placed between the test “100.’’
...