GB/T 9639.1-2008: Plastics film and sheeting -- Determination of impact resistance by the free-falling dart method -- Part 1: Staircase methods

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Scope

1.1 This Part of GB/T 9639 specifies methods for the determination of the energy that
causes plastics film and sheet less than 1 mm in thickness to fail under specified
conditions of impact of a free-falling dart from a specified height that would result in
failure of 50% of the specimens tested.
1.2 Two methods of test are described.
1.2.1 Method A employs a dart with a 38 mm ± 1 mm diameter hemispherical head
dropped from a height of 0.66 m ± 0.01 m. This method may be used for materials
whose impact resistance requires masses of about 0.05 kg to about 2 kg to fracture
them.
1.2.2 Method B employs a dart with a 50 mm ± 1 mm diameter hemispherical head
dropped from a height of 1.50 m ± 0. 01 m. Its range of applicability is from about 0.3
kg to about 2 kg.
1.3 The measurement technique is the staircase method. A uniform missile mass
increment is employed during testing and the missile weight is decreased or increased
by the uniform increment after test of each specimen, depending upon the result
(failure or no failure) observed for the specimen.

Basic Data

Standard ID	GB/T 9639.1-2008 (GB/T9639.1-2008)
Description (Translated English)	Plastics film and sheeting -- Determination of impact resistance by the free-falling dart method -- Part 1: Staircase methods
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080.01
Word Count Estimation	9,996
Date of Issue	2008-08-19
Date of Implementation	2009-05-01
Older Standard (superseded by this standard)	GB/T 9639-1988
Quoted Standard	GB/T 2918-1998; GB/T 6672-2001; GB/T 20220-2006
Adopted Standard	ISO 7765-1-1988, IDT
Regulation (derived from)	National Standard Approval Announcement 2008 No.14 (Total No.127)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the energy and determination of the number of specimens damaged plastic film sheets up 50%. Impact damage to the quality of representation. This section applies to plastic film and sheet thickness of less than 1mm.