ASTM D1746 - 09

    Standard Test Method for Transparency of Plastic Sheeting

    Active Standard ASTM D1746 | Developed by Subcommittee: D20.40

    Book of Standards Volume: 08.01


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    Significance and Use

    The attribute of clarity of a sheet, measured by its ability to transmit image-forming light, correlates with its regular transmittance. Sensitivity to differences improves with decreasing incident beam- and receptor-angle. If the angular width of the incident beam and of the receptor aperture (as seen from the specimen position) are of the order of 0.1° or less, sheeting of commercial interest have a range of transparency of about 10 to 90 % as measured by this test. Results obtained by the use of this test method are greatly influenced by the design parameters of the instruments; for example, the resolution is largely determined by the angular width of the receptor aperture. Caution should therefore be exercised in comparing results obtained from different instruments, especially for samples with low regular transmittance.

    Regular transmittance data in accordance with this test method correlate with the property commonly known as see-through, which is rated subjectively by the effect of a hand-held specimen on an observer's ability to distinguish clearly a relatively distant target. This correlation is poor for highly diffusing materials because of interference of scattered light in the visual test.

    1. Scope

    1.1 This test method covers the measurement of the transparency of plastic sheeting in terms of regular transmittance (Tr). Although generally applicable to any translucent or transparent material, it is principally intended for use with nominally clear and colorless thin sheeting.

    1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

    1.3 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 is no similar or equivalent ISO standard.

    Note 2—For additional information, see Terminology E 284 and Practice E 1164.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D618 Practice for Conditioning Plastics for Testing

    D883 Terminology Relating to Plastics

    D1003 Test Method for Haze and Luminous Transmittance of Transparent Plastics

    E284 Terminology of Appearance

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

    E1164 Practice for Obtaining Spectrometric Data for Object-Color Evaluation

    E1316 Terminology for Nondestructive Examinations

    E1345 Practice for Reducing the Effect of Variability of Color Measurement by Use of Multiple Measurements

    E1347 Test Method for Color and Color-Difference Measurement by Tristimulus Colorimetry

    E1348 Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry


    UNSPSC Code

    UNSPSC Code 30265802(Plastic sheet)


    Referencing This Standard

    DOI: 10.1520/D1746-09

    ASTM International is a member of CrossRef.

    Citation Format

    ASTM D1746-09, Standard Test Method for Transparency of Plastic Sheeting, ASTM International, West Conshohocken, PA, 2009, www.astm.org

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