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ASTM F470-89(2003)

Historical Reaffirmation

Standard Practice for Caking Temperature of Dry Electrostatic Toner

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1.1 This practice covers the determination of the temperature at which a dry toner will cake as storage temperatures are raised.

1.2 In certain cases the effects of pressure or pressure combined with heat can cause blocking and caking of a dry toner. This recommended practice does not provide for evaluation of such pressure effects.

1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


Dry toners for use in electrostatic copiers and printers are normally free-flowing powders at room temperatures. They are often formulated to fuse at elevated temperatures as part of the electrostatic printing and copying process. The specific temperature at which fusing takes place has implications of premature change in the physical characteristics of a given toner, defined as blocking or caking. This is undesirable, but can result when the dry toner is subjected to temperatures in the range of its fusing point during conditions of transport, storage, or local handling; as well as to the environmental parameters in a given location after the product is introduced and held for use in the machine reservoir itself.

SDO ASTM: ASTM International
Document Number F470
Publication Date Oct. 27, 1989
Language en - English
Page Count 2
Revision Level 89(2003)
Supercedes
Committee F05.04
Publish Date Document Id Type View
Feb. 1, 2009 F0470-89R09 Revision
Dec. 10, 1998 F0470-89R98 Reaffirmation
Oct. 27, 1989 F0470-89R03 Reaffirmation