CR39 1.499 Single Vision HMC EMI Semi Finished Lens Blanks With Anti Radition Coating
I. Specifications:
| Index | Monomer | Abbe value |
| 1.499 | CR 39 | 56 |
| Specific Gravity | Transmission | Coat |
| 1.34 | 98% | Hard Multi Coated |
| Diameter | Base | State |
| 65/70/75mm | 50~1000 | Semi Finished |
II. Features:
 | 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. |
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.
| 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. 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. |  |
III. Technical Data:
IV. Prodcution Process:
V. Packing :
| Envelop | Outer box |
| Choice 1 | Choice 2 | Finished lens | Semi-finished lens |
| White envelop | color envelop with customer design
weight : 157g size : 9*9*9cm | about 500 pairsper carton, 21kgs | about 100 pairs per carton, 15kgs |
| standard export paper carton 38cm*48cm*35cm ( 0.064 CBMS ) |
VI. Shipping:
| Samples | Batch goods |
| By Fedex, DHL, UPS, TNT etc . | By air, sea, express |
| Delivery time: within 3 days | Delivery time: about 10-30 days, depend on your quantity |
VII. Our service:
1. Our Customer service will begin to track the product processing every day until you receive the goods and verify the product quality when you finish the payment.
2. Online via SKYPE,Whatsapp;Also through mail, voice phone, message could contact us at any time!
3. Follow up the case, record the entire process. Solution will be provide with 24 hours.
Meanwhile,the problem complaint will be reported to QC department.
QC will find defect from which department ,who is in charge to identify responsibility.
4. Collect and record all the voice from each customer respond , suggestion, requirement.
5. We own the best after-sale service,if any problems happen,our team will do our best to solve for customers.
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HMC EMI Cr39 Single Vision Lenses Blanks 1.499 Index Anti Radition Coating Images
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