1、9007276 0024802 b52 H Mgnation:D 21 33-81 a b AMERICAN SOCIETY FOR TESTINQ AND MATERIALS 1916 Race St.,Phi&ipha,Pa.19103 Reprinted from the Annual Book of ASTM Standads,Copyright ASTM If not listed in th.Current canbinad index,will in the m c h.Standard Specification for ACETAL RESIN INJECTION MOLDI
2、NG AND EXTRUSION MATERIALS This nradrud u issued under the iued designation D 2133;the number immediately foiiowing the designation indiater the idopcion or,in the case of miSion,the year of k t reviaion.A number in parenthesa inditta the year of last Z$YEipc-pt cpson(e)indiestes an ditoriai cimngc
3、since the iast revision or mpprovai.1.scope 1.1 This specification covers two types of acetal resin materials suitable for injection molding or extrusion,or both.2.Applicable Documents 2.1 ASTM Standards:D 150 Tests for A-C Loss Characteristics and Permittivity(Dielectric Constant)of Solid Electrica
4、l Insulating Materials2 D 618 Conditioning Plastics and Electrical Insulating Materials for Testing D638 Test for Tensile Properties of Plas-tia2 D 648 Test for Deflection Temperature of Plastics Under Flexural Load2 D792 Tests for Specific Gravity and Den-sity of Plastics by Displacement D 1238 Tes
5、t for Flow Rates of Thermoplas-tics by Extrusion Plastomete8 D 1898 Recommended Practice for Sam-D 3892 Practice for Packaging/Packing of PlastiCS2 E 1 1 Specification for Wire-Cloth Sieves for Testing Purposes3 G 23 Recommended Practice for Operating Light-and Water-Exposure Apparatus(Carbon-Arc Ty
6、pe)for Exposure of Non-metallic Materials*pling of Plasticsa 3.clrpsiileation classes according to applications as follows:3.2.1 Class A-Natural color only,con-taining an antioxidant,for general purpose use.Applicable to Types I and II.3.2.2 Class B-Black,containing.carbon black pigment,for weather-
7、resistant uses.Applicable only to Type I.3.2.3 Class C-Natural,containing a light stabilizer,for weather-resistant uses.Applica-ble only to Type I.4.Physical Requirements 4.1 The resins described in this specifica-tion shall be free of foreign matter to such a contamination level as may be agreed up
8、on between the purchaser and the seller.4.2 Additives:4.2.1 Types I and II,Class A shall contain an antioxidant.4.2.2 Type I,Class B shall contain a coq-centration of uniformly dispersed,high-color carbon black.4.2.3 Type I,Class C shall contain a con-centration of light stabilizer.4.3 Color-Unless
9、otherwise specified the acetal resin shall contain no color pigment.4.4 Form-The acetal resin shall be in the form of pellets and shall contain a surface lubricant when specified by agreement be-tween the purchaser and the seller.4.5 Specific gravity,melting point,and melt flow rate shall be as spec
10、ified in Table 1.3.1 This specification covers the following two types of acetal resins,classified according to melt flow:ing.I This Mication is the jurisdiction of ASTM commina i)-20 on Piastics and is the d i r d responsibility OfsukdtkCD20.15 On eticMcn.Current edition approved June 26,1981.Publi
11、shed Octo-ber 1981.Originallypublishedas D2133-62T.Last pn-viou edition D 2133-78.3-1-1 Type 1-Matenal for injection mold-3.1.2 Type II-Material for extrusion.3.2 The two types are subdivided into Annual Book o f ASTM Standardr,Part 35.8A-IBoo&fATM&,part41.f i.-.I-.-NOTICE:This standard has either b
12、een superseded and replaced by a new version or discontinued.Contact ASTM International(www.astm.org)for the latest information.-9009276 0024803 599-4.6 Tensile yield strength,elongation,tensile modulus of elasticity,deflection temperature under load,and weather resistance shall be as specified in T
13、able 2.4.7 Dielectric constant and dissipation factor.if required,shall be as agreed upon between the manufacturer and the purchaser.S.Sampm115.1 Unless otherwise agreed upon betweenthe purchaser and the seller,the materials shall be sampled in accordance with Recommended Practice D 1898.Adequate st
14、atistical sampling shall be considered an acceptable alternative.6.Test Methods6.1 The mechanical properties of specimens molded or extruded from acetal resins are influenced by a number of factors,such as cylinder temperature,die temperature,rate of filling the die,and preconditioning prior to test
15、ing.It is essential that the manufacturers recommendations on molding and extrusion conditions be followed.Determine the pro erties enumerated in these specifications in accordance with the following methods:6.1.1 Conditioning-For tests of tensile properties and deflection temperature under load,con
16、dition the molded test specimens in accordance with Procedure A of Methods D 618.For tests of dielectric constant and dissipation factor,condition the specimens in accordance with Procedure D of Methods D 618.The other tests require no conditioning.6.1.2 Test Conditions-Conduct tests for tensile properties in the Standard Laboratory Atmosphere of 23 2C(73.4 3.6F)and 50 5%relative humidity as defined in Procedure A of Methods D 618.Tests for specific gravity,melting point,and melt flow rate may b
