Src

[sandeepgoodbole]

In India, we have two options of SRC. Tintable and non Tintable.
What is the technical difference? Why some are nontintable ? Which type is considerded more resistant?

[Darryl Meister]

It's hard to describe specific differences between coatings based solely upon "tintable" and "non-tintable," since there are several kinds of both. However, non-tintable coatings are generally more scratch-resistant than tintable coatings. The other noteworthy difference being that one is tintable while the other is not (or at least less tintable). Tintability is generally something that you sacrifice when you improve the hardness of the coating, but other factors are also considered -- such as how good of a substrate the coating will be for AR stacks. You might check with the suppliers of your coatings to learn about more specific details.

Best regards,
Darryl

[sandeepgoodbole]

Originally posted by Darryl Meister
It's hard to describe specific differences between coatings based solely upon "tintable" and "non-tintable," since there are several kinds of both. However, non-tintable coatings are generally more scratch-resistant than tintable coatings. The other noteworthy difference being that one is tintable while the other is not (or at least less tintable). Tintability is generally something that you sacrifice when you improve the hardness of the coating, but other factors are also considered -- such as how good of a substrate the coating will be for AR stacks. You might check with the suppliers of your coatings to learn about more specific details.

Best regards,
Darryl

What's the better method ? Dipping or in Mould coating ? Can you suggest some web link of suplliers?

[Darryl Meister]

Each method has its advantages and disadvantages (though I would hate to make any generalizations solely on the basis of application method). For instance, one practical difference between coating methods occurs with multifocals and potential segment waves. And a lot will depend upon the nature of the actual coating resin and process used. As far as suppliers go, I am assuming that you're more interested in applying in-office or laboratory hard coatings. (Larger manufacturers may use several different proprietary resins that have been chemically engineered by their own people to achieve various performance criteria for their particular products.) There are several suppliers of smaller coating systems, including Ultra Optics (www.ultraoptics.com), Gerber Coburn (www.gerbercoburn.com), etc. (Not that I endorse any one in particular).

Best regards,
Darryl