1.1 This specification defines the standard temperature and humidity for conditioning and testing of materials at nominally ambient conditions.

1.2 There are many other temperature and humidity conditions which may be appropriately used to test end use conditions such as freezer, refrigerated or abusive storage. These need to be individually established.

1.3 Temperature and humidity alone are not sufficient to completely define a storage condition. Many other factors may be relevant (such as time, light and atmospheric pressure) which are defined in this specification.

1.4 Only those materials which fall into the general area of flexible packaging materials are included. Many other materials which were included in earlier versions of this specification may also need a definition.