# Softening point

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The '''softening point''' is the temperature at which a material softens beyond some arbitrary softness.<ref>
{{cite book
  |last = Petrie
  |first = Edward 
  |author-link = Edward M. Petrie
  |title = Handbook of Adhesives and Sealants
  |url = https://archive.org/details/handbookadhesive00petr
  |url-access = limited
  |page = [https://archive.org/details/handbookadhesive00petr/page/n172 146]
  |publisher = [McGraw-Hill](/source/McGraw-Hill)
  |year = 2006 
  |isbn = 0-07-147916-3}}
</ref> It can be determined, for example, by the [Vicat](/source/Vicat_softening_point) method (ASTM-D1525 or ISO 306), [Heat Deflection Test](/source/Heat_Deflection_Test) (ASTM-D648) or a ring and ball method (ISO 4625 or ASTM E28-67/E28-99 or ASTM D36 or ASTM D6493 - 11 or JIS K 6863). A [ring and ball apparatus](/source/Ring_and_Ball_Apparatus) can also be used for the determination of  softening point of bituminous materials.<ref>{{cite web|title=Softening Point / Ring & Ball Apparatus|url=http://cooper.co.uk/product-category/bitumen-testing/softening-point-ring-and-ball-method/|website=cooper.co.uk|publisher=Cooper Research Technology Ltd.|accessdate=16 July 2015}}</ref>

==See also==
* [Glass Transition Temperature](/source/Glass_transition)

==References==
<references/>

Category:Temperature
Category:Polymer chemistry
Category:Glass physics

{{thermodynamics-stub}}

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