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screen printing => Screen Making => Topic started by: Prosperi-Tees on December 05, 2011, 10:36:33 PM
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Any thoughts on this emulsion? 1 particular question, how much syrup is supposed to actually be in the sensitizer bottle? I have a guy selling a gallon for real cheap unopened but the sensitizer bottle is the syrup kind and there is not much in there at all. Is that how its supposed to be?
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I can't tell you exactly how much sensitizer is supposed to be in there, but can assure you that the bottle is pretty empty, to allow water to be added and the powder or syrup to be dissolved when shaken,
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Thats what I thought cause it is pretty empty. I figure for 25 bucks I cant go wrong. Anyone here use it?
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It's all i use.
Use warm water and fill the bottle 1/2 way. Stir the syrup first then add the rest of the water and shake well.
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I've used enough of that emulsion to fill an olympic pool.
What I like:
VERY water resistant with no post hardening required
Easy to mix with the syrup
Good shelf life
Trade-off:
Not as high resolution as some other diazo emulsions
Do you have specific questions about it?
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What is the shelf life?
Do you think it is possible to split up the gallon into 4 qts?
I am using a blacklight exposure unit with vaccumn, any rough exposure times?
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With powdered sensitizer, it's much easier to divide it into four for quarts than with syrup. I don't know if diluting it with water, to make it easier to divide will affect it's life, but you may be able to extend it with refrigeration, (similar to sensitized emulsion).
Otherwise, they only rate sensitized emulsion at 3-6 weeks, but up to three months in a fridge. Here's the Tech Sheet. http://www.ulano.com/TechData/925-925WR.tds.pdf (http://www.ulano.com/TechData/925-925WR.tds.pdf)
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Looks like ill have to make room in the fridge! lol. I know you can way the powder on a gram scale and that is what I thought about the syrup but you would have to add the water. Now does anyone know if the clock starts on the sensitizer as soon as water is added.
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Probably starts when diluted, but I'd call a tech at Ulano if I were you. Those guys usually love their work and are happy to help.
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good stuff. We use if for the occasional water based project, works great. Usually a little harder to reclaim, but no deal breaker. We buy it by the quart and keep it in the fridge.
Steve
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Thats what I thought cause it is pretty empty. I figure for 25 bucks I cant go wrong. Anyone here use it?
Decent emulsion.
Our version 903WR sells regularly for $32 per gallon.
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Thats what I thought cause it is pretty empty. I figure for 25 bucks I cant go wrong. Anyone here use it?
Decent emulsion.
Our version 903WR sells regularly for $32 per gallon.
What is the shelf life? You have a tech bulletin?
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Thats what I thought cause it is pretty empty. I figure for 25 bucks I cant go wrong. Anyone here use it?
Decent emulsion.
Our version 903WR sells regularly for $32 per gallon.
What is the shelf life? You have a tech bulletin?
Once sensitized about 30-45 days. I have Pure Photopolymer emulsions in the $40's
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What color is the 925WR supposed to be when sensitized?
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its like a tan color if i remember right..i think new its only in the 40 range? great old school diazo emulsion..
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Ok good I sensitized it today and the tan color made me nervous! lol
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Probably starts when diluted, but I'd call a tech at Ulano if I were you. Those guys usually love their work and are happy to help.
I got a call from Ed in Tech at Ulano, and he said that adding water to the syrup won't start the clock running . . . only once it's added to the emulsion. He did say when splitting that it was important to weigh it out carefully as it was possible to lose some of the characteristics of the emulsion if mixed out of proportion with the diazo.
He also mentioned that the effectiveness of post exposure to harden emulsion was in direct proportion to achieving full exposure to begin with, for any emulsion. In other words, post exposure wouldn't completely make up for initial underexposure.
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Probably starts when diluted, but I'd call a tech at Ulano if I were you. Those guys usually love their work and are happy to help.
I got a call from Ed in Tech at Ulano, and he said that adding water to the syrup won't start the clock running . . . only once it's added to the emulsion. He did say when splitting that it was important to weigh it out carefully as it was possible to lose some of the characteristics of the emulsion if mixed out of proportion with the diazo.
He also mentioned that the effectiveness of post exposure to harden emulsion was in direct proportion to achieving full exposure to begin with, for any emulsion. In other words, post exposure wouldn't completely make up for initial underexposure.
I had heard that it was not the diazo sensitized emulsions that benefited from post exposure as much as the pre-sensitized one part photoplymer variety.