Transparent plastic refractive index test

Transparent plastic refractive index test methods are described in ASTM D0542 (ISO 489), Index of Refraction of Transparent Organic Plastics. Test methods for transmission through clear plastic sheet are described in ASTM D1746, Regular Transparency of Clear Sheet, Ratio of Undiffused Transmission Flux to Incident Flux. Specular transmission is a property of transparent plastic sheet to show clearly a relatively distant object. ASTM D1044 is entitled Resistance of Transparent Plastics to Surface Abrasion. ... 

FIGURE 3.85 Test for index of refraction of transparent plastics. Refractive index=real depth (measured with vernier)/apparent depth (D2—Di). Standard test method ASTM D542, ISO R489. 

Transparency, gloss, color, refractive index, and reflectance are the properties normally associated with aesthetics of plastic materials. In some areas, changes in optical properties, increases in haze after abrasion testing (285), color differences after weathering, and birefringence analysis of residual stress within a transparent part (286) are all used to measure the effects of applied stresses. Measurements of color, gloss, refractive index, and haze apply to many products beyond plastics and use similar techniques. Reference should be made to this general topic for detailed information (see Color). 

Fibers represent a special case, as such optical properties as refractive index and birefringence are important not so much for their influence on the appearance or performance of the product but as an aid to fiber identification. Fiber optical properties are considered in Chapter 19. Although similar identification techniques are applicable to transparent plastics in general, such tests are not widely used outside the forensic. science... 

Index of Refraction of Transparent Organic Plastics. Primary Film Test Method ASTM D542 Additional Test Method ISO 489. The... 

ASTM D542 Standard Test Method for Index of Refiac-tion of Transparent Organic Plastics. Used to measure the index of refraction of transparent organic plastic materials through use of arefiactometer. D542 requires optically homogeneous specimens of uniform refractive index. This test method and ISO 489 are technically equivalent. 

ASTM D542 (1995). Standard test method for index of refraction of transparent organic-plastics. 

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