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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The specimen surface must be free from surface warpage, waviness, or curvature. 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. Surface test areas shall be free from abrasion and warpage.
The control knob is adjusted so that astmm meter indicates the value assigned to the primary standard. You may delete a document from your Alert Profile at any time.
ASTM D – 15 Standard Test Method for Transparency of Plastic Sheeting
All specular gloss values are based on a primary reference standard. Birefringence is referred to as stress birefringence and its contributions are: Proceed to Checkout Continue Shopping. 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.
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. From the orientation of the molecules further conclusions regarding the material properties can be derived.
Plastic Optical Testing
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. We think you have liked this presentation. Its measured by quantity of light deviates by more than 2. Subscription pricing is determined by: A detector in the sphere measures the total transmittance and haze. Transparency is defined as the light diffused in a small angle range within 2.
The values given in parentheses are for information only. This standard is also available to be included in Standards Subscriptions. Several additional techniques are used in conjunction with the basic photoelastic concept, which make it possible to analyze complex or unusual problems. This standard is not included in any packages.
OPTICAL PROPERTIES. – ppt video online download
The gloss value is directly read on the instrument. Orientation of the crystallites and the form birefringence arising from the interfaces between crystalline zstm amorphous regions. The optical properties of a substance mainly depends on the Molecular structure, morphological characteristics type and amount of additives, processing conditions and post processing operations. You can download and open this file to your own computer but DRM prevents opening this file on another computer, including a networked server.
There are two types of angle distribution. Need more than one copy?
When a photo elastic material is strained and viewed under polarized light. If a calibrated standard is to be used, it is inserted in the specimen holder, and the instrument brought to balance upon the value assigned to the standard.
Knowledge of these optical properties is needed for several reasons: This standard is not included in any packages. Already Subscribed to this document. d17466
Although generally applicable to any translucent or transparent material, it is principally intended for use with nominally clear and colorless thin sheeting.
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Standard Test Method for Transparency of Plastic Sheeting
Standards Subsctiption may be the perfect solution. Subscription pricing is determined by: Caution should therefore be exercised in comparing results obtained from different instruments, especially for samples with low regular transmittance.
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