Marker paint that changes colour with heat


Marker paint that changes colour with heat - someone mentioned this to me
and I wondered what it is called? - used for sweating out studs in aluminum
castings and turns colour just before the Al starts to melt.
Charlie+
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Charlie+
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Page 592 of mcmaster carr catalog on line has crayons that will melt at specific temperatures.
Wes -- "Additionally as a security officer, I carry a gun to protect government officials but my life isn't worth protecting at home in their eyes." Dick Anthony Heller
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Wes
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Reply to
Rick
Tempilstiks and Tempilaq are what's normally used to check surface temps. They melt on reaching the stated temp. Might be cheaper to get a reflected IR surface temperature gauge than a whole set of Tempilstiks, the guns with laser spotters run about $20-40 now, cheaper if you've got an HF coupon...
Stan
Reply to
stans4
Tempilac or Tempilsticks depending on what you want.
Reply to
Steve W.
"Charlie+" wrote in message > Marker paint that changes colour with heat - someone mentioned this to me
There's no need to get the casting that hot to remove a stud. Just wipe a little motor oil on the area of interest and heat til the oil smokes, that's hot enough. phil
Reply to
Phil Kangas
Temperature Indicating Crayons -- McMaster Carr; available in the following indication points:
104° F 188° F 256° F 350° F 463° F 650° F 1022° F 1500° F 109° F 194° F 263° F 363° F 475° F 700° F 1050° F 1550° F 119° F 200° F 275° F 375° F 488° F 750° F 1100° F 1600° F 125° F 206° F 288° F 388° F 500° F 800° F 1150° F 1650° F 140° F 213° F 300° F 400° F 518° F 850° F 1200° F 1700° F 150° F 219° F 313° F 413° F 525° F 900° F 1250° F 1800° F 158° F 225° F 325° F 425° F 550° F 932° F 1300° F 1900° F 169° F 239° F 338° F 437° F 575° F 950° F 1400° F 1950° F 175° F 250° F 344° F 450° F 600° F 1000° F 1450° F 2000° F
LLoyd
Reply to
Lloyd E. Sponenburgh
On Wed, 21 Apr 2010 08:33:38 +0100, Charlie+ wrote as :
Just to say thank you all for your answers and information - the motor oil idea sounds cheap and cheerful also and might be worth a try to start! Thanks everyone - Charlie+
Reply to
Charlie+

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