Couldy or Milky surface

**seree.1997** · 10-23-2009, 01:31 AM

I had dip CR39 lenses in the vanish when I lift it up I found that the surface is become milky like cloudy. Who have the same experience like this, please support.

**Chris Ryser** · 10-23-2009, 02:18 AM

Originally Posted by seree.1997

I had dip CR39 lenses in the vanish when I lift it up I found that the surface is become milky like cloudy. Who have the same experience like this, please support.

Your hard coat material went bad, through heat and or humidity or age or your lens was not CR39 and a high index or polycarbonate.

**seree.1997** · 10-23-2009, 02:32 AM

Originally Posted by Chris Ryser

Your hard coat material went bad, through heat and or humidity or age or your lens was not CR39 and a high index or polycarbonate.

My lenses is definitely CR39, but the heat and humidity should be the cause. what is the properly condition of the vanish? This couldy will always appear even this hard coat is fresh or obsolence.

**Chris Ryser** · 10-23-2009, 03:44 AM

Originally Posted by seree.1997

My lenses is definitely CR39, but the heat and humidity should be the cause. what is the properly condition of the vanish? This couldy will always appear even this hard coat is fresh or obsolence.

Your dip coating material is most probably a thermocure polysiloxane. Those material have to be shipped on dry ice, kept in a fridge or freezer/
These materials are very sensitive to humidity of which you have plenty. See that you work in a clean room condition, means also temperature and humidity control. Check back with the supplier or better the manufacturer of the materials.

**Didier** · 10-23-2009, 09:57 AM

Agree with Chris, 90% sure this is humidity. In the lacqer or in the air.

If this is in the lacqer, not much thing to do. Change it. Somebody told me once you can add something who will catch the water but never tried and will probably never do.

But if the humidity is in the air, you can try to work with warmer lacqer. It will attrack less of this humidity.

While typing this message, I'm thinking (Thats append sometime :hammer:) Doing cr-39, Your caustic maybe too strong and you may etch the lenses too much. Check the lenses just after etching.

**seree.1997** · 10-25-2009, 10:35 PM

in case that I have the humidity in vanish how to evaporate or remove it out? The humidity in the air we can control with the air hanlding unit with can control both of temperature and humidity.

**Chris Ryser** · 10-26-2009, 02:28 AM

If you have water in your varnish you can not remove it. It is spoled. Get a new one.

**seree.1997** · 10-26-2009, 03:08 AM

Really, I can not remove it by stirring or? But one thing why when use this vanish for longtime the cloudy seem like slightly disappear? Is it possible that the moisture is go away?