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hashashan

Member Since 17 Apr 2007
Offline Last Active Jun 05 2008 09:09 AM
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Posts I've Made

In Topic: Potassium Bromate?

19 February 2008 - 11:05 AM

From my experience... this is a very dengerous mixture. it will ignite from friction and a sharp blow, sometimes mixtures conaining S and BrO3 will spontaniously combust on drying.

I use KBrO3 in different mixtures and it is quite sensitive even without S. they detonate(yes I do mean detonate and not deflagrate) 50% of the time when hit with a hammer against a hard surface(the hit doesnt need to be too hard)

In Topic: Hemis

17 February 2008 - 11:05 AM

I used low heat in the oven. about 100 degrees

In Topic: Hemis

17 February 2008 - 07:06 AM

Well the method works just fine now.
made two perfect hemis. one with dextrin glue and another one with sodium silicate.
I have to say that the dextrin is much better then the silicate, and it is easier to work with.
I first dry t in the oven for 10 minutes and then I take it out.
Ill post pictures shortly

In Topic: Hemis

13 February 2008 - 07:51 AM

sorry for the double post
made a few hemis KarlosH's way, they do turn out perfect and easy to make, but I do have another problem with them. After spending couple of hours not in the mould they deform and get an eliptic form. Anyone else have this problem?
How do you dry your hemis?

In Topic: Hemis

06 February 2008 - 07:24 AM

KarlosH : do you have an upper mould to press the hemis? how do you press the paper layers together?
how did you make the upper mould?