 |
1.Low weight
Lenses of hard resin have density of 1.31g/cm3,almost
half of that of standard crown glass.The low
weight of the lenses gives more comfort for
the spectacle wearers.
2.Safety
Lenese of
hard resin have excellent impact resistance
lens with a centre thickness of 2mm or more
comply with the CEN lens-stength norm and the
FDA balldrop test norm.
3.Optical quality
Lenses of hard resin have very hight light transmission(Among
the highest for optical plastics).The ABBE number
is hight (59).CR-39 gives a sharp defined image
for plastics.
4.Special Lens
Treatment
Monomer allow for special treatment such as
rimless frames,color tinting for style or sunglass
,UV-protection and photochromic.
5.Lens Curve Stailing
The temerature resistance of CR-39 monomer gives
plastic lenses the strength to sustain stable
curve design.
Raw material
DIETHYLENE GLYCOL BIS(ALLYL,CARBONATE)
Raw material
manufacturer
PPG industrial Ltd.& great lake Chemica
|
 |
|
