ASTM D4495-2000(2005) Standard Test Method for Impact Resistance of Poly(Vinyl Chloride) (PVC) Rigid Profiles by Means of a Falling Weight《落锤法测试硬质聚氯乙烯型材耐冲击性的标准试验方法》.pdf
《ASTM D4495-2000(2005) Standard Test Method for Impact Resistance of Poly(Vinyl Chloride) (PVC) Rigid Profiles by Means of a Falling Weight《落锤法测试硬质聚氯乙烯型材耐冲击性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D4495-2000(2005) Standard Test Method for Impact Resistance of Poly(Vinyl Chloride) (PVC) Rigid Profiles by Means of a Falling Weight《落锤法测试硬质聚氯乙烯型材耐冲击性的标准试验方法》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 4495 00 (Reapproved 2005)An American National StandardStandard Test Method forImpact Resistance of Poly(Vinyl Chloride) (PVC) RigidProfiles by Means of a Falling Weight1This standard is issued under the fixed designation D 4495; the number immediately following the designation indicat
2、es the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This test method covers the determination o
3、f the energyrequired to crack or break rigid poly(vinyl chloride) (PVC)profile under specified conditions of impact by means of afalling weight.1.2 This test method is able to be used by itself or inconjunction with other methods of measuring PVC producttoughness.1.3 Because of the wide variety of p
4、rofile sizes and shapesand the wide variety of manufacturing procedures and fieldabuse, this test method does not correlate universally with alltypes of abuse. Therefore, correlations must be established asneeded.1.4 The text of this standard references notes and footnoteswhich provide explanatory m
5、aterial. These notes and footnotes(excluding those in tables and figures) shall not be consideredas requirements of this standard.1.5 The values stated in inch-pound units are to be regardedas the standard.NOTE 1There is no equivalent or similar ISO standard.1.6 This standard does not purport to add
6、ress all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 618 Practic
7、e for Conditioning Plastics for TestingD 883 Terminology Relating to PlasticsE 178 Practice for Dealing with Outlying Observations3. Terminology3.1 DefinitionsDefinitions are in accordance with Termi-nology D 883, unless otherwise indicated.3.2 Definitions of Terms Specific to This Standard:3.2.1 fa
8、ilure the presence of a brittle failure readilyvisible by the naked eye, including a sharp crack, split, orshatter in any part of the profile as a result of the impact of thefalling weight. Failure does not include ductile tears (where thesurfaces at the tip of the crack have a greater than 0 angle)
9、, orductile breaks (hinged breaks where the cracked part remainsjoined to the unbroken part throughout the length of thecracked part or section), (Fig. 1).3.2.2 mean failure heightthe height from which thefalling weight will cause 50 % of the specimens to fail.3.2.3 mean failure energyenergy require
10、d to produce50 % failures. The product of the weight and mean failureheight.3.2.4 outlieran observation that appears to deviate mark-edly from other members of the sample in which it occurs.4. Summary of Test Method4.1 The profile is cut into lengths of at least 6 in. The testmethod establishes the
11、height from which a standard fallingweight will cause 50 % of the specimens to fail.5. Significance and Use5.1 The impact strength of PVC profiles relates to suitabilityfor service and to quality of processing. Impact tests are usedfor quality-control purposes and as an indication that productscan w
12、ithstand handling during assembling, installation, or inservice.5.2 Results obtained by use of this test method can be usedin two ways:5.2.1 As the basis for establishing impact-test requirementsin product standards, and5.2.2 To measure the effect of changes in materials orprocessing.1This test meth
13、od is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommitte D20.24 on Plastic Building Products.Current edition approved Mar. 1, 2005. Published March 2005. Originallyapproved in 1985. Last previous edition approved in 2000 as D 4495 00.2For referenc
14、ed ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1*A Summary of Changes section appears at the end of this standard.Copyrig
15、ht ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Apparatus6.1 GeneralOne type of impact tester is illustrated in Fig.2.6.2 Falling Weight, shall be cylindrical and 212 in. indiameter, with a flat-bottom surface that strikes the testspecime
16、n.NOTE 2It is suggested that the striking portion of the weight be madeof scratch-resistant steel to reduce damage to the striking surface. Badlyscarred surfaces may affect test results.6.2.1 The mass of the falling weight shall be 10 6 0.5 lb.6.3 Drop Tube, shall be of sufficient length (approximat
17、ely12 ft (4 m) to provide for a fall of at least 10 ft (3 m) and shallbe mounted so that the lengthwise direction is vertical, asmeasured with a plumb bob or a spirit level at least 2 ft (600mm) in length.6.3.1 Care must be taken to ensure that the weight fallsfreely; it must not “chatter” down the
18、tube.NOTE 3No particular material for the drop tube is specified. However,a cold-drawn seamless steel tubing with an inside diameter of 258 to 234in. (67 to 70 mm) has been found to be satisfactory. It may also benecessary to provide a protective barrier around the specimen, particularlyfor larger s
19、izes of profile, to protect the operator from flying brokenpieces.NOTE 4The dropped weight may not fall freely if the clearancebetween the weight and tube is too large or too small, or if it is restrainedby a partial vacuum above the weight, such as can be caused by the holdand release device.6.3.2
20、Means shall be provided to hold the weight to bedropped at steps of 2 in. (50 mm) for a distance of 2 to 10 ft(600 mm to 3 m) above the flat-plate holder, to release theweight in a reproducible manner, and to allow the weight to fallfreely.6.4 Specimen HolderThe flat plate shall be used as aspecimen
21、 holder.FIG. 1 Types of BreaksD 4495 00 (2005)26.4.1 The rigid steel flat-plate holder shall consist of a plateapproximately 8 by 12 by 1 in. (200 by 300 by 25 mm). Thespecimen holder shall be fastened to a concrete slab (floor).Means shall be provided to center the specimens under the droptube.7. T
22、est Specimens7.1 The profile shall be not less than 6 in. (150 mm) inlength.7.2 When the approximate mean-failure height for a givensample is known, 20 specimens usually yield sufficientlyprecise results. If the mean failure height is not able to beapproximated, six or more specimens shall be used t
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