# Average Reflectance 98% Optical Mirror/ Flat Mirror/ Dielectric Mirror for Precision Optical Imaging Instruments

> Average Reflectance 98% Optical Mirror/ Flat Mirror/ Dielectric Mirror for Precision Optical Imaging Instruments — an optical mirror: Glass. Specs, RFQ…

- Page: https://machiningglass.com/products/average-reflectance-98-optical-mirror-flat-mirror-dielectric-mirror-for-precision-optical-imaging-instruments/
- SKU: MG-30E22E
- Category: Optical Lenses, Prisms & Mirrors > Optical Mirrors & Reflective Substrates
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Average-Reflectance-98-Optical-Mirror-Flat-Mirror-Dielectric-Mirror-for-Precision-Optical-Imaging-Instruments.webp
- Updated: 2026-10-24

Application: Medical, Civil, Labs.

## Overview

The Average Reflectance 98% Optical Mirror/ Flat Mirror/ Dielectric Mirror for Precision Optical Imaging Instruments is supplied as an optical mirror made from Glass. Listed geometry: diameter 2-250mm, plano shape. Flatness Lambda/4, Lambda/2 or as Reques. Typical applications: Medical, Civil and Labs. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Material | Glass |
| Shape | Plano |
| Diameter | 2-250mm |
| Clear Aperture | 90% |
| Application | Medical, Civil, Labs |
| Radius | 5mm |
| Surface Flatness | Lambda/4, Lambda/2 or as Reques |
| Surface Roungh | 10/5, 80/50 or Better |
| Key | Optical Mirrors |
| Supplier | Shanghai Jingsheng Optoelectronics Technology Co., Ltd |

## Technical data

| Parameter | Value |
| --- | --- |
| Material | BK7, Fused Silica, Borofloat,B270, Borosilicate(Pyrex) or other |
| Dimension Tolerance | +0.0/-0.1mm |
| Thickness Tolerance | ±0.2mm |
| Clear Aperture | >90% |
| Surface Quality | 60/40 scratch and dig |

## What to specify when you request a quote

- **Material** — listed as “Glass”; name the glass or crystal.
- **Geometry** — listed as “2-250mm”; give diameter, focal length or radii, angles and tolerances.
- **Surface figure** — listed as “Lambda/4, Lambda/2 or as Reques”; quote surface figure (λ) and scratch-dig.
- **Centring and edges** — state centration and edge chamfer.
- **Coating** — list the band and reflectance or transmission target.

## Engineering guides for this part

For material grades and coating options, see [Fused Silica Windows for UV and Laser Optical Systems](https://machiningglass.com/materials/fused-silica-windows-for-uv-and-laser-optical-systems/). How parts like this are machined and finished is covered in [Laser Assisted Glass Cutting for Tight Tolerance Parts](https://machiningglass.com/capabilities/laser-assisted-glass-cutting-for-tight-tolerance-parts/). For an application example, read [How to Handle and Maintain Precision Glass Components in Laser Systems](https://machiningglass.com/applications/how-to-handle-and-maintain-precision-glass-components-in-laser-systems/). Before sending a drawing, check [Technical Guide to Glass Thickness and Flatness Requirements](https://machiningglass.com/resources/technical-guide-to-glass-thickness-and-flatness-requirements/). A related standard product is [Laser Beam Splitter Glass Sheet](https://machiningglass.com/products/laser-beam-splitter-glass-sheet/).

## FAQ

### What is the Average Reflectance 98% Optical Mirror/ Flat Mirror/ Dielectric Mirror for Precision Optical Imaging Instruments made of?

It is listed as Glass. 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 2-250mm. Custom outlines and thicknesses are made to drawing; state the tolerance you need.

### Where is this optical mirror used?

Listed applications: Medical, Civil and Labs.

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

Include material, geometry, surface figure, centring and edges and coating, 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=18155#mg-rfq

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