ASTM D Standard Test Method for Transparency of Plastic Sheeting. Clarity – ASTM D This test method covers the measurement of the transparency of plastic sheeting. While this test may be used for any transparent material. Find the most up-to-date version of ASTM D at Engineering
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Knowledge of these optical properties is needed for several reasons: The L, a, b values are correlated with L, a, b Chart.
ASTM D – 09 Standard Test Method for Transparency of Plastic Sheeting
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Share buttons are a little bit lower. 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.
This correlation is poor for highly diffusing materials because of interference of scattered light in the visual test. If the document is revised or amended, you will be notified by email.
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ASTM D – 15 Standard Test Method for Transparency of Plastic Sheeting
Colour is measured by a particular wavelength of light reflect and producing sensation in the observer eye. This standard is also available to be included in Standards Subscriptions.
The light is travelling in the direction perpendicular to the plane of the paper. We have no amendments or corrections for this standard. My presentations Profile Feedback Log out. Already Subscribed to this document.
Since the refractive indexes nx and ny indirections x and y of the stressed polymer are different, the wavelengths of the two wave components tx and ty are also different, therefore the two waves will be out of phase when leaving. We think you have liked this presentation.
If you wish to download it, please recommend it to your friends in any social system. The specimen is placed in the specimen holder.
A specimen measuring 6. As the voice of the U. The difference in the two velocities shows up a birefringence. 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. The total transmittance light is consists of the direct transmitted and diffused components which are depending on the angular distribution of light.
Orientation of the crystallites and the form birefringence arising from the interfaces between crystalline and amorphous regions. The specimen surface must be free from surface warpage, waviness, or curvature. Transparency is defined as the light diffused in a small angle range within 2.
All specular gloss values are based on a primary reference standard.
Plastic Optical Testing
A light source is illuminated. The variables of appearance include glossiness or matness, opacity or transparency, smoothness or roughness, and metallic reflection or diffusion surfaces of parts of its rays. Caution should therefore be exercised in comparing results obtained from different instruments, especially for samples with low regular transmittance.
The size of specimen is approximately 50mm in diameter. Please first log in with a verified email before subscribing to alerts. The two essential elements of visual colour evaluation are: If at any time an instrument fails to repeat readings of the standard to within 2 percent of the prior setting the intervening result should be rejected.
Next, the sensor is placed on the specimen surface and the gloss value is read directly from the analog or digital display. Its measured by quantity of light deviates by more than 2. Add to Alert PDF.