Rec Specs

[Rheaopt]

Is there any reason why you can't use CR-39 at safety thickness in a pair of Rec Specs?
Is it just a better move to use poly or trivex?

Thanks
Steve

[QDO1]

because it can shatter if a squash ball hits it. A squash ball has the Potential Energy of a 22 bullet!"

[Chris Ryser]

Is there any reason why you can't use CR-39 at safety thickness in a pair of Rec Specs?
Is it just a better move to use poly or trivex?

If it passes the safety regulations................you should be able to use CR39

[Andrew Weiss]

Steve, in theory you could, but in practice I wouldn't because of the thickness I'd need to have to achieve enough impact resistence. Poly or Trivex will be thinner.

[jofelk]

Cr-39 safety would be OK for certain low impact activities. If you are using the eyeware in a high impact situation, I would recommend a frame specifically made for this environment, using polycarb. Hilco (Zoom) and Rec Spec, and others, can supply appropriate frames.

[QDO1]

Excuse me for stating the obvious, but REC SPECS are sold specifically for safter in a sports environment

Here is an example of the relevant materials in a video clip

http://www.laramyk.com/learn/trivex_comparison.html

I use these clips sometimes when dispensing, I dont have any problem getting the message accross

[Johns]

Of course you can use it, but if your in court and they ask you if you did everything in your power to make sure that the safest meterial was used, you may not have a good answer.

It's a tough call if you have someone that has a problem wearing poly.

[eromitlab]

trivex works fabulously... I used to refuse making a rec spec unless they were sold with trivex lenses.

poly is okay, but trivex is far more superior in clarity and impact resistance, and I had better luck surfacing it thin enough for kids that had higher plus scripts that it didn't pop out or look like a sawed off coke bottle rather than poly.

I'd flat out refuse any type of active use frame with CR39 lenses... it's just too much of a risk for shattering or cracking, and thicknesses are never as good as trivex or to a lesser extent polycarb.

[Aarlan]

At VE East last year I asked the RECSPEC salesperson about using Trivex rather than Poly, and he adamantly said that it was a bad idea. The frame and the literature and the tags and everything else on the RecSpec screams out to ONLY USE POLY!! I originally thought that he just didn't know what Trivex was, but he said something about, "ask your rep what happens when you A/R a Trivex"...Had no idea what he was talking about. Also the lab that I use will not surface a Trivex to a 2.0 CT in Z87 Safety Frames like they will Poly...

I wonder what an opportunistic lawyer would do to your practice if you used a CR39 in a recspec and it had an issue?

AA

[flast122]

Just so you know Trivex has not been tested with ASTM standards. Your call