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HMC EMI Cr39 Single Vision Lenses Blanks 1.499 Index Anti Radition Coating
Home » Products » Semi Finished Lens » SF 1.499 Single Vision Lens » HMC EMI Cr39 Single Vision Lenses Blanks 1.499 Index Anti Radition Coating
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HMC EMI Cr39 Single Vision Lenses Blanks 1.499 Index Anti Radition Coating

  • Semi Finished Single Vision
  • Aogang
  • 9001509900
  • 1.499
  • 70mm
  • CR39
  • 58
  • 1.32
  • > 97%
  • UC, HC, HMC
  • Base: 50~1000
Quantity:

Product Description

Index

Monomer

Abbe value

1.499

CR 39

58

Specific Gravity

Transmission

Coat

1.32

97%

Hard Multi Coated

Diameter

Base

State

65/70/75mm

50~1000

Semi Finished


Product Features

HMC EMI Cr39 Single Vision Lenses Blanks 1.499 Index Anti Radition Coating
  • Semi Finished Lens

 

The starting point for freeform production is a semi-finished lens, also known as a puck due to its resemblance to an ice hockey puck. These are produced in a casting process that is also used to manufacture stock lenses. The semi-finished lenses are produced in a casting process. Here, liquid monomers are first poured into moulds. Various substances are added to the monomers, e.g. initiators and UV absorbers. The initiator triggers a chemical reaction that leads to hardening or "curing" of the lens, while the UV absorber increases the UV absorption of the lenses and prevents yellowing.

 

  • CR39 

 

1). Low Weight: Lenses of hard resin have a gravity 1.31/cm3, almost half of that of standard crown glass.The low weight of the lenses give comfort for the spectacle wearers.

 

2). Safety: Lenses of hard resin have excellent impact resistance lenses with a centrethinkness of 2mm or more comply with the cen lens-strength norm and the FDA balldrop test norm.

 

3). Optical Quality: Lenses of hard resin have a very high light transmission(among the highest for optical plastics). The Abbe number is high(57) CR-39 monomer gives a sharp defined image for plastic lens wearers.

 

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 impact resistance of CR-39 monomer gives plastic lenses the strength to sustain stable curve design.

AR Coating

In the dipping process a lacquer is applied to the lens to make it scratch-resistant. Specially adapted lacquers are used for the various plastic materials with different refractive indices. The hard protective coating is about two microns thick. After ultrasonic cleaning the anti-reflective coatings are applied in a vacuum deposition process. 

HMC EMI Cr39 Single Vision Lenses Blanks 1.499 Index Anti Radition Coating

The individual lenses are arranged in special racks known as calottes. A modern coating has up to 9 individual layers – the overall package is around 400 nanometers thick. 

 

The most important benefits of anti-reflective (AR) coating may be the unseen advantage–relief from fatigue and eyestrain caused by glare.


Technical Data

1.499

Contact Us

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