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ASTM D5767-95(2004)

(Test Method)

Standard Test Methods for Instrumental Measurement of Distinctness-of-Image Gloss of Coating Surfaces

Standard Test Methods for Instrumental Measurement of Distinctness-of-Image Gloss of Coating Surfaces

SIGNIFICANCE AND USE
An important aspect of the appearance of glossy coating surfaces is the distinctness (clarity) of images reflected by them. The values obtained by the measuring procedures given in these methods generally correlate well with visual ratings for DOI (image clarity).4  
Although Test Methods D 523 and D 4039 are useful in characterizing some aspects of glossy appearance, they do not provide satisfactory ratings for DOI (image clarity).
The measurement conditions given conform to the conditions specified in Test Methods E 430.
The measurement conditions given in Test Methods B and C conform to the conditions specified in ISO Standard #10216.
The scale values obtained with the measuring procedures of these methods range from 0 to 100 with a value of 100 representing perfect DOI (image clarity).
The DOI (image clarity) scale value does not of itself, indicate any specific cause for reduction in reflected image sharpness. Surface irregularities such as haze, orange peel, and wrinkle, when present, may be cited as causes for reduction of image sharpness.
SCOPE
1.1 This test method describes the measurement of the distinctness-of-image (DOI) gloss of coating surfaces using electro-optical measuring techniques. The coatings must be applied to planar rigid surfaces. The scale values obtained from the alternative methods cited do not agree.
1.2 Three test methods are covered as follows:
1.2.1 Test Method AGloss reflectance factor measurements are made on the specimen at the specular viewing angle and at an angle slightly off the specular viewing angle. The values obtained are combined to provide a DOI value. Very narrow source and receptor aperture angles are used in the measurements.
1.2.2 Test Method BThe light through a small slit is projected on the specimen surface and its reflected image intensity is measured through a sliding combed shutter to provide a value of image clarity.
1.2.3 Test Method CThe light through a pattern is projected on the specimen surface and its reflected image intensity is measured directly to provide a value of image clarity.
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 whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Oct-2004
ICS
25.220.01 - Surface treatment and coating in general
Technical Committee
E12 - Color and Appearance
Drafting Committee
E12.03 - Geometry
Current Stage
Ref Project

Relations

Replaces
ASTM D5767-95(1999) - Standard Test Methods for Instrumental Measurement of Distinctness-of-Image Gloss of Coating Surfaces
Effective Date
01-Nov-2004
Replaced By
ASTM D5767-95(2012) - Standard Test Methods for Instrumental Measurement of Distinctness-of-Image Gloss of Coating Surfaces
Effective Date
01-Jul-2012
Referred By
ASTM D7270-07(2021) - Standard Guide for Environmental and Performance Verification of Factory-Applied Liquid Coatings
Effective Date
01-Nov-2004
Referred By
ASTM D6486-23 - Standard Practice for Short Term Vehicle Service Exposure of Automotive Coatings
Effective Date
01-Nov-2004
Referred By
ASTM D3451-06(2017) - Standard Guide for Testing Coating Powders and Powder Coatings
Effective Date
01-Nov-2004
Referred By
ASTM D5382-02(2017) - Standard Guide to Evaluation of Optical Properties of Powder Coatings
Effective Date
01-Nov-2004

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ASTM D5767-95(2004) - Standard Test Methods for Instrumental Measurement of Distinctness-of-Image Gloss of Coating SurfacesASTM D5767-95(2004) - Standard Test Methods for Instrumental Measurement of Distinctness-of-Image Gloss of Coating Surfaces
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ASTM D5767-95(2004) - Standard Test Methods for Instrumental Measurement of Distinctness-of-Image Gloss of Coating Surfaces
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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
Designation: D5767 − 95 (Reapproved2004)
Standard Test Methods for
Instrumental Measurement of Distinctness-of-Image Gloss
1
of Coating Surfaces
This standard is issued under the fixed designation D5767; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope D823Practices for Producing Films of Uniform Thickness
of Paint, Varnish, and Related Products on Test Panels
1.1 This test method describes the measurement of the
D2457Test Method for Specular Gloss of Plastic Films and
distinctness-of-image (DOI) gloss of coating surfaces using
Solid Plastics
electro-optical measuring techniques. The coatings must be
D3964Practice for Selection of Coating Specimens for
appliedtoplanarrigidsurfaces.Thescalevaluesobtainedfrom
Appearance Measurements
the alternative methods cited do not agree.
D4039Test Method for Reflection Haze of High-Gloss
1.2 Three test methods are covered as follows:
Surfaces
1.2.1 Test Method A—Gloss reflectance factor measure-
E284Terminology of Appearance
ments are made on the specimen at the specular viewing angle
E430TestMethodsforMeasurementofGlossofHigh-Gloss
and at an angle slightly off the specular viewing angle. The
Surfaces by Abridged Goniophotometry
values obtained are combined to provide a DOI value. Very
2.2 Other Standards:
narrow source and receptor aperture angles are used in the
ISO 10216Anodized Aluminum and Aluminum Alloys—
measurements.
Instrumental Determination of Image Clarity of Anodic
3
1.2.2 Test Method B—The light through a small slit is
Oxidation Coatings—Instrumental Method
projected on the specimen surface and its reflected image
intensity is measured through a sliding combed shutter to 3. Terminology
provide a value of image clarity.
3.1 Terms and Definitions in Terminology E284 are appli-
1.2.3 Test Method C—The light through a pattern is pro-
cable to these methods.
jectedonthespecimensurfaceanditsreflectedimageintensity
3.2 Definitions:
is measured directly to provide a value of image clarity.
3.2.1 distinctness-of-image gloss, n—aspect of gloss char-
1.3 This standard does not purport to address all of the
acterized by the sharpness of images of objects produced by
safety concerns, if any, associated with its use. It is the
reflection at a surface. E284
responsibility of whoever uses this standard to consult and
3.2.1.1 Discussion—This quality is sometimes called Image
establish appropriate safety and health practices and deter-
Clarity.
mine the applicability of regulatory limitations prior to use.
3.2.2 gloss reflectance factor, R ,n—ratio of the specularly
s
2. Referenced Documents
reflectedpartofthe(whole)fluxreflectedfromthespecimento
2
the flux reflected from a specified gloss standard under the
2.1 ASTM Standards:
same geometric and spectral conditions of measurements.
D523Test Method for Specular Gloss
E284
3.2.2.1 Discussion—The gloss standard may be a black
1
This test method is under the jurisdiction of ASTM Committee E12 on Color
glass or mirror and may be assigned one of a variety of scale
and Appearance and is the direct responsibility of Subcommittee E12.03 on
Geometry.
values as specified.
Current edition approved Nov. 1, 2004. Published November 2004. Originally
3.2.3 specular angle, n—the angle of reflection equal and
approved in 1995. Last previous edition approved in 1999 as D5767–95(1999).
DOI: 10.1520/D5767-95R04. opposite to the angle of incidence. E284
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D5767 − 95 (2004)
TABLE 1 Angles and Dimensions of Source Image and Receptors
7.1.1 Geometric Conditions—The axis of the incident beam
Dimensions of Dimensions of the Dimensions of shall be 20 or 30° from the perpendicular to the specimen
Source Image at Viewed Area at the Viewed
surface. Provisions shall be made so that receptor settings will
Sample Plane, ° Sample Plane, ° Area DOI, °
be at the specular angle and at an angle of 0.2 to 0.4° off the
Center of window 20 or 30 20 or 30 0.3 ± 0.1
A specularangle.Suitableangulardimensionsoftheimageofthe
Width 0.44 0.38 0.14
B
Length 7.0 4.0 4.0
source aperture and angular dimensions of the receptor aper-
A
ture
...

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4.1 An important aspect of the appearance of glossy coating surfaces is the distinctness (clarity) of images reflected by them. The values obtained in this measuring procedure correlate well with visual ratings for DOI (image clarity).  
4.2 Although Test Methods D523 and D4039 are useful in characterizing some aspects of glossy appearance, they do not provide satisfactory ratings for DOI (image clarity).  
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SCOPE
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SCOPE
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1.2 The values stated in inch-pound units are to be regarded as standard. The metric (SI) units, given in parentheses, are for information only.  
1.3 Painting facilities shall comply with all applicable Federal and State regulations regarding emissions and waste disposal.  
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 Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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ASTM
ASTM D6676/D6676M-21(Test Method)
Standard Test Method for Cathodic Disbonding of Exterior Pipeline Coatings at Elevated Temperatures Using Interior Heating

SIGNIFICANCE AND USE
4.1 Damage to a pipe coating is almost unavoidable during transportation and construction. Breaks or holidays in pipe coatings may expose the pipe to possible corrosion since, after a pipe has been installed underground, the surrounding earth will be moisture-bearing and will constitute an effective electrolyte. Applied cathodic protection potentials may cause loosening of the coating, beginning at holiday edges. Spontaneous holidays may also be caused by such potentials. Usually exterior pipeline coatings applied over pipes carrying hot media (oil, gas) are exposed to high temperature inside the pipe and low temperature outside and subjected to temperature gradient. Heat flux is directed from metal (substrate) to the coating. This test method provides accelerated conditions for cathodic disbondment to occur under simulated heating and provides a measure of resistance of coatings to this type of action.  
4.2 The effects of the test are to be evaluated by physical examinations and monitoring the current drawn by the test specimens. Usually there is no correlation between the two methods of evaluation, but both methods are significant. Physical examination consists of assessing the effective contact of the coating with the metal surface in terms of observed differences in the relative adhesive bond. It is usually found that the cathodically disbonded area propagates from an area where adhesion is zero to an area where adhesion reaches the original level. An intermediate zone of decreased adhesion may also be present.  
4.3 Assumptions associated with test results include:  
4.3.1 Maximum adhesion, or bond, is found in the coating that was not immersed in the test liquid, and  
4.3.2 Decreased adhesion in the immersed test area is the result of cathodic disbondment.  
4.4 Ability to resist disbondment is a desired quality on a comparative basis, but disbondment in this test method is not necessarily an adverse indication of coating performance. The virtue of this...
SCOPE
1.1 This test method describes an accelerated procedure for determining comparative characteristics of coating systems applied to the exterior of steel pipe for the purpose of preventing or mitigating corrosion that may occur in underground or immersion where the pipe is carrying heated media and is under cathodic protection. This test method is intended for use with samples of coated pipe, or with a specimen cut from the section of coated pipe or flat plates and is applicable to such samples when the coating is characterized by function as an electrical barrier.  
1.2 This test method is intended to simulate conditions when external coatings are exposed to high temperature inside the pipe and to an ambient temperature outside, and thus are subjected to temperature gradient. If elevated temperatures are required but without temperature gradient, see Test Method G42.  
1.3 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
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 Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Standard
    9 pages
    English language
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  • Standard
    9 pages
    English language
    sale 15% off