Irreversible temperature sensitive labels

less

I may make my own rough indicators. So a few common tested materials

Photocopier toner wiped onto paper label starts fusing about 90 degrees C White soap rubbed onto paper label turns brown at about 160 degrees. From a selection of those small circular sticky backed paper circles of different colours, the blue one changed most to very dark blue at about 200 deg C and flourescent green one became ordinary green. Mylar plastic sheet starts crinkling up at 120 deg C , totally melting by

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

A simple Google search for crayon temperature uk found this site. There were others.

Charlie

like,

One other material I'd overlooked is thermal paper for fax or till roll

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

by

The till roll paper I tried started to go blue at 75 deg C , so an assorment of punched out paper dots with appropriate coatings/impregnations and high temp glue should give a reasonable idea of max temps

You can buy ready made temp sensitive labels you know.

Ron(UK)

Do a search on temp-spy+adhesive. There are several results.

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"Model TS3 covers a narrow range of approximately 20°C with 3 indicators." I'm already perfectly aware of such labels but my OP referred to a much more extended range of temps, which I've yet to see examples of or be pointed to.

-- Diverse Devices, Southampton, England electronic hints and repair briefs , schematics/manuals list on

In message , N Cook writes

Have you clicked on 'Catalog'? Whal seem to have a fair selection of ranges. Ian.