GB/T 7141-2008: Plastics -- Methods of heat aging

Delivery: 9 seconds. Download (and Email) true-PDF + Invoice.
Get Quotation: Click GB/T 7141-2008 (Self-service in 1-minute)
Newer / historical versions: GB/T 7141-2008

Preview True-PDF

Scope

1.1 This Standard specifies the exposure conditions when plastics are only
exposed to hot air at different temperatures for a long time. This Standard only
specifies the method of heat exposure, but does not specify the test method or
specimen. The influence of heat on any properties of plastics can be determined
by selecting suitable test methods and specimens. This Standard recommends
the use of ASTM D3826 standard to determine the end point of embrittlement.
The end point of embrittlement means that at an initial strain rate of 0.1 mm/min,
when 75% of the tested specimens have an elongation at break of 5% or less,
the material reaches its end point of embrittlement.
1.2 This Standard gives guidelines for comparing the heat aging properties of
materials. These properties are measured by changes in certain related
properties (that is, the embrittlement properties are measured by the decrease
in elongation). This Standard applies to the evaluation of plastics that are easily
oxidized during use.
1.3 The results obtained in accordance with this Standard are affected by the
type of heat aging test chamber used. The user can choose one of two methods
to conduct heat aging test chamber exposure. The results based on these two
methods shall not be confused with each other.
1.3.1 Method A: Gravity convection heat aging test box – It is recommended for
thin specimens with a nominal thickness of not more than 0.25mm.
1.3.2 Method B: Forced ventilation heat aging test chamber – It is
recommended for specimens with a nominal thickness greater than 0.25mm.
1.4 This Standard introduces methods to compare the heat aging properties of
materials at a single temperature. This Standard also describes the method for
determining the heat aging properties of materials at a series of temperatures,
so as to estimate the time required for the material to change its properties at a
lower temperature. This Standard does not predict the heat aging performance
when factors such as stress, environment, temperature and time control failure
interact.
1.5 This Standard does not involve relevant safety instructions. Even if there is,
it is only related to its application. It is the responsibility of users of this Standard
to establish applicable safety and health regulations and to determine
applicable regulatory limits before use.
NOTE: There is no ISO standard equivalent to this Standard.

Basic Data

Standard ID	GB/T 7141-2008 (GB/T7141-2008)
Description (Translated English)	Plastics -- Methods of heat aging
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	G31
Classification of International Standard	83.080; 83.080.01
Word Count Estimation	9,932
Date of Issue	2008-08-14
Date of Implementation	2009-04-01
Older Standard (superseded by this standard)	GB/T 7141-1992
Quoted Standard	GB/T 2035; GB/T 2918; GB/T 7142; GB/T 11026.4-1999; ISO 16014-2; ASTM D3826-1998 (2002)
Adopted Standard	ASTM D5510-1994 (2001), MOD
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 plastic is exposed longer exposure conditions at different temperatures only when the hot air. This standard specifies the method only heat exposure. Without the test methods or specimen requirements. Any performance impact of heat on plastic are available through select appropriate test methods and sample measured. This standard recommended embrittlement determined using ASTM D3826 standard end point, the end point is the embrittlement in the initial strain rate of 0. 1mm/min, when 75% of the elongation at break of the test sample is 5% or less, the value of the material embrittlement that reaches its end.