NEWS - lr-test

29 May

Calculation of Yellowness Index and Whiteness Index Using Instrumental Color Coordinates

Meaning and use 5.1 This practice should only be used to compare samples of the same material and the same general appearance. For example, a range of specimens to be compared should have roughly similar lustre, texture and (if not opaque) thickness and semi-transparency. 5.2 For yellowness measurements, this practice is limited to samples whose main wavelength is in the range 570 to 580nm or whose Munsell hue is approximately 2.5GY to 2.5Y. For whiteness measurements, this practice is limited to [...]

29 May

Calculation of Color Tolerances and Color Differences Using Instrumental Color Coordinates

Meaning and use 5.1 The original CIE color scale based on the tri stimulus values X, Y, Z and chroma coordinates x and y was visually uneven. Each subsequent color scale based on CIE values applies a weighting factor to provide a degree of uniformity so that the color differences in each region of the color space will be more comparable. On the other hand, the same samples evaluated in different color scale systems are unlikely to achieve the same [...]

29 May

ASTM E 1347-2003 “Determination of Color and Color Difference by three-Stimulus Value (Filter) Colorimetric Method”

Scope: This test method covers instrumental measurement of a sample using a three-stimulus colorimeter (also known as a three-stimulus filter colorimeter or chromatic difference meter) to obtain color coordinates and chromatic difference values. The test method specifies the color coordinates and color difference 45:0 and 0:45 geometry measured by reflected or transmitted light using a hemispherical optical measurement system (such as a integrating sphere) or a bidirectional optical measurement system (such as a ring, circumference or single plane). Because of the limited [...]

29 May

ASTM D2616-2012 “Evaluation of Visual Color Difference by Gray Sample Card”

ASTM D2616-2012 “Evaluation of Visual Color Difference by Gray Sample Card” range This test method describes a painted grayscale and visually evaluates the color difference of non-self-luminous materials by comparing it to that scale. Document record ASTM D2616 July 1, 2012 Standard test method for evaluating visual chromatic aberration by grayscale This test method describes a painted grayscale and visually evaluates the color difference of non-self-luminous materials by comparing it to that scale. This standard… ASTM D2616 March 10, 1996 Standard test method for assessing visual chromatic aberration by [...]

26 May

ASTM E 1478-97-2015 “Self-Evaluation of Color in Transparent Sheet Materials”

Meaning and use 5.1 This practice applies to production quality control and customer acceptance of regular transmission sheet (such as tinted Windows), where the importance of visual color discrimination is needless to say. ASTM E 1478-97-2015 “Self-Evaluation of Color in Transparent Sheet Materials” range 1.1 This practice is intended to help its users critically judge the transmitted color appearance of the transparent sheet. Its main applications are colored plate glass and plastic materials. 1.2 This practice is not appropriate for assessing the colour of [...]

26 May

Color of Clear Liquids (Plus Color Scale) ASTM D 1544-2018

Meaning and use 3.1 This test method is applicable to dry oils, varnishes, fatty acids, polyfatty acids and resin solutions. Its use in other materials has not been tested. Color of Clear Liquids (Plus Color Scale) ASTM D 1544-2018 range 1.1 This test method measures the color of a clear liquid by comparing it with any numbered glass standard. 1.2 Users of this method should have normal color vision. 1.3 Values expressed in SI units shall be treated as standard values. No other units of [...]

26 May

ASTM D6762-2018 “Determination of Covering Power of Coatings by Self-Evaluation of Spraying Construction Coatings”

Meaning and use 5.1 The test method determines the coverage of the test coating by visually evaluating the sprayed coating. Note 1 Test method D2805 describes an instrumental method for determining coverage. Apply the film to a uniform thickness (e.g. with a scraper), measure the film thickness strictly, and determine the opacity by photometry. Thus the concealment force can be determined with high precision. 5.2 Test method D6762 is not as accurate as test method D2805, but it is widely used because [...]

26 May

ASTM D 4370-2017 “Acid and Base milligram Equivalent Content in Tank”

Meaning and use 4.1 Acid and base concentrations are measurements of titratable acidic and basic components in the electrophoresis tank. These measurements are used for research, manufacturing or electrophoretic bath process control. ASTM D 4370-2017 “Acid and Base milligram Equivalent Content in Tank” range 1.1 These test methods cover the determination of milli-equivalent amounts of acids and bases in anode and cathode electrophoretic baths and their ultrafiltrate. 1.2 Values expressed in SI units shall be regarded as standard values. No other units of measurement [...]

25 May

ASTM G62-2022 Standard Test Method for Detection of Leakage Points of Pipe Coatings

Meaning and use 5.1 Method A — Method A describes a rapid and safe method for determining whether there are pinholes, voids, or metal particles protruding from the coating. However, this method does not detect any thin spots in the coating. This method will determine if there are any serious defects in the film pipe coating. 5.2 Method B — Method B describes a method for determining whether there are pinholes, voids, or metal particles protruding from the coating and thin [...]

25 May

ASTM G9-07-2020 Standard Test Method for Water Permeability of Pipe Coatings

Meaning and use 4.1 The deterioration of insulation film is closely related to its moisture content. The water permeability test provides a way to monitor the passage of water through the coating material by changes in the dielectric constant of the coating material. When expressed in time, the test data will reflect the rate of deterioration of the coating material properties and will correlate with its expected service life as an insulating coating. The water penetration test will also provide [...]