# Sapphire Optical Window Optical LED Lenses for Instrument Glass Watch Crystal Manufactory Fabrication

> Sapphire Optical Window Optical LED Lenses for Instrument Glass Watch Crystal Manufactory Fabrication — a display / touchscreen cover glass: Optical…

- Page: https://machiningglass.com/products/sapphire-optical-window-optical-led-lenses-for-instrument-glass-watch-crystal-manufactory-fabrication/
- SKU: MG-E8E1BC
- Category: LED / OLED Cover Glass > Display, Touchscreen & Instrument Cover Glass
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Sapphire-Optical-Window-Optical-LED-Lenses-for-Instrument-Glass-Watch-Crystal-Manufactory-Fabrication.webp
- Updated: 2026-10-24

Product type: Concave Lens. Application: Optical.

## Overview

Sapphire Optical Window Optical LED Lenses for Instrument Glass Watch Crystal Manufactory Fabrication is a display / touchscreen cover glass made from Optical Glass. Listed geometry: diameter 1mm-500mm, cylindrical shaped lens shape. Optical / electrical data: transmittance >95%. Coating: UV; surface quality 40/20;60/40; flatness 1/4 Lambda. It is used in Optical. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Optical Glass |
| Type | Concave Lens |
| Shape | Cylindrical Shaped Lens |
| Diameter | 1mm-500mm |
| Transmittance | >95% |
| Coating | UV |
| Surface Quality | 40/20;60/40 |
| Usage | Optical |
| Lenses Color | Clear |
| Coat | Anti-Reflective (Ar) Coatings |
| Clear Aperture: >90% of Diameter | >90% of Diameter |
| Surface Flatness | 1/4 Lambda |
| Specifications | Diameter (Φmm) |
| Clear Aperture | >90% of Diameter: >90% of Diameter |
| Supplier | Jiaozuo Commercial Finewin Co., Ltd. |

## Technical data

| Parameter | Value |
| --- | --- |
| Product name | industrial sapphire wafer |
| sapphire optical lens chemical formula | AL2O3 |
| Crystal structure | Hexagonal |
| Hardness Mohs | 9H |
| Compressvise strength | Gpa 2.0 |
| Density(20ºC) | 3.98g/cm |
| Fusion point | 2040ºC |
| Boiling point | 2980ºC |
| Coefficient of Thermal Expansion | α=5.8×10 -6 /K |
| Specific heat | 0.418W.s/g/k |
| Optical transmission range | 0.17-5.5μm |
| Transmission(0.3~5um) | 85-88% |
| Refractive index | no=1.768nd |
| ne=1.76nd |  |
| Permittivity | 11.5(//c), 9.3(⊥c) |

| Parameter | Value |
| --- | --- |
| Diameter (Φmm) | 8.0, 10.0, 12.7, 15.0, 20.0, 25.4, 30.0 |
| Thickness (mm) | 0.5, 1.0, 2.0 |
| Diameter Tolerance (mm) | +0.0/-0.2 (General), +0.0/-0.1 (High Precision) |
| Thickness Tolerance (mm) | ±0.2 (General), ±0.05 (High Precision) |
| Clear Aperture | >75% (Small Size), >90% (Large Size) |
| Parallelism | 3 min. (General), 10 sec. (High Precision) |
| Surface Quality: Scratch/Dig | 80/50 (General), 40/20 (High Precision) |
| Bevel (face width x 450) | <0.25mm |
| Coating | Upon customer's request |

| Parameter | Value |
| --- | --- |
| Refractive index (nd) | 1.768 |
| Coefficient of dispersion (Vd) | 72.2 |
| Density (g/cm3) | 3.97 |
| TCE(μm/mºC) | 5.3 |
| Soften Temperature(ºC) | 2000 |
| Knoop hardness(kg/mm2) | 2200 |

## What to specify when you request a quote

- **Glass type and thickness** — listed as “Optical Glass”; name the glass (soda-lime, aluminosilicate, borosilicate) and thickness.
- **Strengthening** — state thermal tempering or chemical strengthening and the required surface compression or impact rating.
- **Printing and coatings** — listed as “UV”; list silk-screen colours, windows, and any AR / AG / AF coating.
- **Outline and edges** — listed as “Cylindrical Shaped Lens”; send a drawing with cut-outs, holes and edge finish.
- **Optical requirements** — listed as “>95%”; give transmission, haze or gloss targets for the viewing area.

## Engineering guides for this part

For material grades and coating options, see [LED Cover Glass Material Guide for Optical Encapsulation](https://machiningglass.com/materials/led-cover-glass-material-guide-for-optical-encapsulation/). How parts like this are machined and finished is covered in [AR Coating Process for Optical Glass Windows – Complete Manufacturing Overview](https://machiningglass.com/capabilities/ar-coating-process-for-optical-glass-windows-complete-manufacturing-overview/). For an application example, read [AR Coated Glass for Appliance Touch Screens: Specs and Selection](https://machiningglass.com/applications/ar-coated-glass-for-appliance-touch-screens-specs-and-selection/). Before sending a drawing, check [Specifying Coatings for Custom Glass Windows and Substrates](https://machiningglass.com/resources/specifying-coatings-for-custom-glass-windows-and-substrates/). A related standard product is [AR Anti-Reflection Optical Window](https://machiningglass.com/products/ar-anti-reflection-optical-window/).

## FAQ

### What is the Sapphire Optical Window Optical LED Lenses for Instrument Glass Watch Crystal Manufactory Fabrication made of?

It is listed as Optical Glass. Coating: UV. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.

### What sizes and thicknesses are available?

The listing gives diameter 1mm-500mm. Custom outlines and thicknesses are made to drawing; state the tolerance you need.

### What optical or electrical performance does it have?

Listed values: transmittance >95%. Confirm the values at your operating wavelength, angle and temperature when you request a quote.

### Where is this display / touchscreen cover glass used?

Listed applications: Optical.

### What should I include in a quote request?

Include glass type and thickness, strengthening, printing and coatings, outline and edges and optical requirements, plus quantity and a drawing if the part is custom.

## Request a quote

Send drawings, tolerances and quantity: https://machiningglass.com/contact/?rfq_product_id=15425#mg-rfq

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Source: Custom Precision Glass Machining — https://machiningglass.com/