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Description of ASTM-D2131 2016ASTM D2131-97-Reapproved2016Historical Standard: Standard Classification for Natural Muscovite Mica SplittingsASTM D2131Scope 1.1 This specification covers the determination of muscovite mica splittings of standard commercial grades and specifies the maximum allowable physical defects for each grade. It is applicable to commercially available natural muscovite mica splittings regardless of the basic color of the mica or its source. 1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 This standard is very similar to ISO 6386. It is expected that materials would be classified identically using the criteria of either standard. The grades shown under “ASTM Grade No.” in Table 1 and Table 2 are shown under “Old Grade No.” in ISO 6386-1981.
(A) 1 in.2 = 6.45 cm2 .
(B) 1 in. = 25.4 mm (exact).
(C) Minimum and maximum thickness of a single splitting in the case of bookform splittings shall be agreed upon
between the purchaser and the seller.
(D) Upon agreement between the buyer and the seller, the minimum area may be
11/2 in.2 (9.7 cm 2).
(A) Not to be included with total allowable defects.
(B) Lots that contain more than 2 % of stained splittings in which the sum of the major dimensions of the
stains exceed 1/4 in. (6.4 mm) shall not be regarded as meeting these standards. No mineral stain shall be permitted in Bookform Splittings. No more than 30 % of
the stain in Nos. 4, 5, and 51/2 Loose with Powder shall be mineral stain. No more than 40 % of the stain in Nos. 6 Loose with Powder, 6-1st, 6-2nd, and 6-3rd
Loose, shall be mineral stain.
(C) To include an evaluation of undersize splittings for other defects.
(D) Examine for the defect listed.
(E) No hole shall be permitted.
(F) Count as a defect if more than 20 % of the periphery is rough or burred.
(G) Same as FootnoteF except 35 %.
(H) Do not examine for the defect listed.
(I) Determine undersize in accordance with Table 1.
Keywords area; bookform; classification; form; grades; loose with powder; mica splittings; muscovite mica; size; thickness; visual quality; ICS Code ICS Number Code 73.080 (Non-metalliferrous minerals) DOI: 10.1520/D2131-97R16 This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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