Castaldo no shrink-pink rubber

Jewelry Discussion
1

Hello friends, i can’ t avoid shrinkage in the rubber no shrink-pink
from castaldo. anybody gets avoid this problem? how? what is the
best time and the best temperature for vulcanizer this rubber?
thanks for all.

2

http://www.castaldo.com/english/usinprod/noshpink.html

Go to the above web site, everything is there.

Jeffrey

3 
    Hello friends, i can' t avoid shrinkage in the rubber no
shrink-pink from castaldo. anybody gets avoid this problem? how?
what is the best time and the best temperature for vulcanizer this
rubber? thanks for all.

Don’t know the time or temp for that rubber (look at the
instructions that came with the material), but I do know that both
must be pretty much right on to keep problems from happening.

John Dach

4

Dear Mr. Lopez,

This is Michael Knight at CASTALDO. 

The key to using our CASTALDO No Shrink Pink jewelry molding rubber

is precise temperature control. Our White Label & Gold Label rubber
are very forgiving and will work at a wide range of temperatures. No
Shrink Pink demands precision.

Most jewelry vulcanizers are out of calibration or out of repair

most of the time and rely on the forgiving nature of our other
products. Sometimes the top plate is hotter than the bottom;
sometimes the right side is colder than the left side.

The only way to find out is to calibrate your vulcanizer with a

good thermomete. Use the following technique .

Place a small block of wood – about 1/4" to 1/2" thick— as a
cheap and easy insulator-- on the bottom plate of the vulcanizer
after it has heated up for a while. Place the probe of the
thermometer on top of it and close the vulcanizer plates gently. Go
about your normal business and check the thermometer once in a while,
noting the readings. After a few hours, repeat the process, this time
with the thermometer under the block of wood.

This way you are isolating the two plates and not measuring the
average of the two. It’s like the old story of the man with one foot
in a bucket of ice water and one foot in a bucket of boiling water–
on average, he’s comfortable.

Once you really KNOW what the temperature is, make a test at 310 F

/154 C, measure the results and increase the temperature one or two
degrees. Repeat as needed.

Please be sure to always make your measurements the same way or you

will not really be doing anything useful. If you measure your wax 5
minutes after it was injected, then do exactly that for all the
tests.

Since wax shrinks a lot in the first five minutes, a little less in

the second five minutes and so on for DAYS, it’s best to wait as long
as you can before measuring. Certainly 1 hour.

Regards,
Michael Knight
CASTALDO# Products Mfg. Corp.
www.castaldo.com