Hi index trivex?

**Ontario Optician** · 10-11-2011, 04:24 PM

Has anyone heard about a stock hi index trivex like lens. Wondering if this is just wishful thinking?

**chip anderson** · 10-11-2011, 05:49 PM

Splain Trivex~like? Is there such an animal?

**sharpstick777** · 10-11-2011, 06:31 PM

You may be refering to Hi-Vex, its a 46 Abbe 1.56 that is safety approved. Nice material, its everything you like about trivex, just thinner, clearer and less expensive. Spec G is slightly higher than Trivex though.

**bhess25** · 10-12-2011, 10:34 AM

looks like its no different than 1.56 sunsensor material. Its brittle like any other hard resin. dont get it confused with trivex, the material is not the same, trivex can be explained more like those old black hard rubber combs, this stuff is nothing like trivex, just 1.56 thats all.

**sharpstick777** · 10-12-2011, 10:57 AM

Originally Posted by bhess25

looks like its no different than 1.56 sunsensor material. Its brittle like any other hard resin. dont get it confused with trivex, the material is not the same, trivex can be explained more like those old black hard rubber combs, this stuff is nothing like trivex, just 1.56 thats all.

Actually, Hi-Vex 1.56 is not brittle. The old 1.56 is the most brittle material there is, and has a fairly poor ABBE, and heavy. The new Hi-Vex is safety approved, drillable, light, high tensile strength, and has the highest ABBE after CR-39 and glass. Its absolutely nothing like the old 1.56.

**bhess25** · 10-12-2011, 10:59 AM

Originally Posted by sharpstick777

Actually, Hi-Vex 1.56 is not brittle. The old 1.56 is the most brittle material there is, and has a fairly poor ABBE, and heavy. The new Hi-Vex is safety approved, drillable, light, high tensile strength, and has the highest ABBE after CR-39 and glass. Its absolutely nothing like the old 1.56.

read this carefuly then retract your previous non-brittle statement. http://www.visionmonday.com/ViewCont...3/Default.aspx

**sharpstick777** · 10-12-2011, 11:26 AM

Originally Posted by bhess25

read this carefuly then retract your previous non-brittle statement. http://www.visionmonday.com/ViewCont...3/Default.aspx

Their comments reflect the bahavior of the material when its subjected to the extreme heat of pressure of surfacing and edging if you look at the context.
The comparision they use is how the lens processes more like a brittle material in finishing and edging, not the behavior of the material to the consumer or ECP. They are comparing processing of Hi-Vex to Poly and Trivex (which process very differently from each other). A brittle material in the ECP definition would crack when drilled, and not be saftey approved. They are correct in that it finishes more like 1.60 than it does Trivex or Poly, in that you don't need to run it on special cycles or settings to process it. We run Hi-vex on a CR-39 cycle, just slower.

Old 1.56 is not safety approved, nor is it drillable, it cracks at a whiff of air = brittle. Hi-Vex is saftey approved, and approved for drills = not brittle.

I would consider their word choice poor, not the product. Try it for yourself, you will see, its completely different from anything on the market.

**bhess25** · 10-12-2011, 12:11 PM

Originally Posted by sharpstick777

Their comments reflect the bahavior of the material when its subjected to the extreme heat of pressure of surfacing and edging if you look at the context.
The comparision they use is how the lens processes more like a brittle material in finishing and edging, not the behavior of the material to the consumer or ECP. They are comparing processing of Hi-Vex to Poly and Trivex (which process very differently from each other). A brittle material in the ECP definition would crack when drilled, and not be saftey approved. They are correct in that it finishes more like 1.60 than it does Trivex or Poly, in that you don't need to run it on special cycles or settings to process it. We run Hi-vex on a CR-39 cycle, just slower.

Old 1.56 is not safety approved, nor is it drillable, it cracks at a whiff of air = brittle. Hi-Vex is saftey approved, and approved for drills = not brittle.

I would consider their word choice poor, not the product. Try it for yourself, you will see, its completely different from anything on the market.

ill order a couple and give it a shot...but if it processes like cr39 they shouldnt market it like trivex. trivex is similiar to those old hard rubber combs, its almost like a rubber material, not a resin.

**sharpstick777** · 10-12-2011, 02:01 PM

Originally Posted by bhess25

ill order a couple and give it a shot...but if it processes like cr39 they shouldnt market it like trivex. trivex is similiar to those old hard rubber combs, its almost like a rubber material, not a resin.

We edge it a little slower than CR-39, with a little less water on Kappas. But your edger may vary. I have not cut Hi-Vex dry. When you drop it on a table it sounds a lot like poly, but when you hold it up to a bright light it doesn't look anything like poly.

They won't give out any info on the resin, but I am speculating its a heat catalyzed non-evaporative co-polymer like Trivex. Basically its probably mixed and baked like Trivex is. However, the catalyst could be part of the mix which would explain the higher pitched sound, or it could be combination of a mixed catalyst that is heat reactive. That actually makes the most sense given the sound and clarity. Its setting fast that way.

**optical24/7** · 10-12-2011, 06:58 PM

Originally Posted by sharpstick777

We edge it a little slower than CR-39, with a little less water on Kappas. But your edger may vary. I have not cut Hi-Vex dry. When you drop it on a table it sounds a lot like poly, but when you hold it up to a bright light it doesn't look anything like poly.

They won't give out any info on the resin, but I am speculating its a heat catalyzed non-evaporative co-polymer like Trivex. Basically its probably mixed and baked like Trivex is. However, the catalyst could be part of the mix which would explain the higher pitched sound, or it could be combination of a mixed catalyst that is heat reactive. That actually makes the most sense given the sound and clarity. Its setting fast that way.

If it's heat catalyzed, I would think it better to dry cut it. Why not try one and tell us how it came out?

**braheem24** · 10-13-2011, 12:18 AM

It edges like cr39 and drill like a soft 1.60

**Craig** · 10-13-2011, 06:55 AM

We edged one as dry and on our trivex roughing wheel, it became a dust ball! It likes water to process and we found that as a 1.56 it was not worth dealing with over the Trivex we love. They were to have a 1.6 hi-vex and that was interesting to me for the weight savings over 1.67, but I have not seen it yet.

The material seems like a nice less expensive option to trivex. They just need to get a few doing free form progressives to compete with trivex, poly and 1.6.

Craig

**Stan Tabor** · 10-13-2011, 12:30 PM

At Silmo, PPG, Novacel (an Essilor lab in Paris) and Thai Optical introduced Tribrid which supposed to be a mix of trivex and high index lens materials. Don't know much else about this other than it is supposed to be applicable to patients in the +/- 3 to +/- 7 range.

HiVex is a nice product but in the edger, it behaves much differently than trivex. Hivex feels much "softer" in the edger, but the edged lens is still very strong. Both products have their strong points.