# Round Transparent Borosilicate Glass Polished High Temperature Borosilicate Glass Sheet High Precision B270 Optical Glass

> Round Transparent Borosilicate Glass Polished High Temperature Borosilicate Glass Sheet High Precision B270 Optical Glass — a precision glass plate /…

- Page: https://machiningglass.com/products/round-transparent-borosilicate-glass-polished-high-temperature-borosilicate-glass-sheet-high-precision-b270-optical-glass/
- SKU: MG-325594
- Category: Perforated & Shaped Plates > Precision Glass Discs, Plates & Sheets
- Image: https://machiningglass.com/wp-content/uploads/2026/10/Round-Transparent-Borosilicate-Glass-Polished-High-Temperature-Borosilicate-Glass-Sheet-High-Precision-B270-Optical-Glass.webp
- Updated: 2026-10-24

Product type: Quartz Plate. Application: Rubber, Plastic, Chemical, Construction, Metallurgy, Ceramic, Casting, Glass. Model: OS-0093.

## Overview

Round Transparent Borosilicate Glass Polished High Temperature Borosilicate Glass Sheet High Precision B270 Optical Glass is a precision glass plate / sheet made from Bk7 / Quartz / K9 Glass. Listed geometry: round shape. Coating: UV-pass UV passband filter. Typical applications: Rubber, Plastic, Chemical, Construction and Metallurgy. Dimensions, material grade, coating and finish can be quoted to your drawing; the values above are the listed starting point.

## Specifications

| Parameter | Value |
| --- | --- |
| Substrate | Bk7 / Quartz / K9 Glass |
| Type | Quartz Plate |
| Shape | Round |
| Clear Aperture | 90% |
| Application | Rubber, Plastic, Chemical, Construction, Metallurgy, Ceramic, Casting, Glass |
| Model NO. | OS-0093 |
| Use | Optics Camera Lens |
| Coating type | UV-pass UV passband filter |
| BK7 Optical Glass | Universal substrate with ≥92% transmittance (400-700nm), good chemical stability and processability. Ideal for camera lenses, optical windows. Operating temp: -20℃ to 200℃. |
| Fused Silica Glass | Excellent transmittance (200-2500nm, ≥90%), ultra-low thermal expansion and high-temperature resistance (≤1000℃). Suitable for laser processing heads and UV detection equipment. |
| Sapphire Optical Glass | Mohs hardness 9, high wear/impact resistance, wide transmittance (200-5000nm) and excellent chemical stability. Perfect for industrial endoscopes, aerospace optical windows. |
| Optoelectronic Imaging | BK7 & low-dispersion glass for DSLRs, industrial vision lenses and medical imaging equipment, ensuring clarity and color reproduction. |
| Laser Technology | Fused silica glass for laser cutting/welding heads and resonant cavity blanks, ensuring laser transmission stability. |
| Semiconductor Manufacturing | High-purity optical glass for lithography and wafer inspection equipment, meeting strict impurity requirements (metal ions ≤1ppm). |
| Aerospace & Security | Sapphire and high-temperature glass for UAV cameras, satellite optical payloads and security lenses, withstanding harsh environments. |
| Supplier | C-Laser (Taicang) Material Technology Co., Ltd. |

## Technical data

| Parameter | Value |
| --- | --- |
| Optical film appearance quality | The coating surface features a 60/40 composition (compliant with U.S. military standard MIL-PRF-13830B) |
| Wrinkles, scratches, and blemishes are acceptable under the contract |  |
| Optical film transmittance% | 330-370 nm:Average transmittance(Tavg)≥ 80% |
| 390 nm ±10 nm:Transmittance≈ 50% |  |
| 410-1200 nm:Average transmittance(Tavg) < 0.1% |  |
| Optical film fastness | Bonding test, without wrinkle and peeling off |
| Boiling resistance to water | No peeling, peeling, warping, discoloration and other defects |
| Optical performance of optical film meets the requirements |  |
| High temperature resistance 350℃×30minute | No peeling, peeling, warping, discoloration and other defects |
| Optical performance of optical film meets the requirements |  |
| Other requirements | Coating type:UV-pass UV passband filter |
| Cut off range 420-1200 nm Need to be suppressed OD ≥ 3 |  |

## What to specify when you request a quote

- **Material** — listed as “Bk7 / Quartz / K9 Glass”; name the glass or quartz grade.
- **Outline and thickness** — give outline, thickness and tolerances.
- **Holes, slots and features** — listed as “Round”; dimension every hole and its position tolerance on the drawing.
- **Edges** — state edge finish and chamfer.
- **Surface** — state polish and flatness where they matter.

## Engineering guides for this part

For material grades and coating options, see [Custom Borosilicate Glass Sheets Cut to Size: Precision and Performance](https://machiningglass.com/materials/custom-borosilicate-glass-sheets-cut-to-size-precision-and-performance/). How parts like this are machined and finished is covered in [Glass Wafer Cutting, Dicing, and Coring: Precision Manufacturing Process](https://machiningglass.com/capabilities/glass-wafer-cutting-dicing-and-coring-precision-manufacturing-process/). For an application example, read [Why Quartz Glass Components Excel in Coffee Heating Modules](https://machiningglass.com/applications/why-quartz-glass-components-excel-in-coffee-heating-modules/). Before sending a drawing, check [Quartz Glass Manufacturing: Controlling Thermal Conductivity in Fused Silica](https://machiningglass.com/resources/quartz-glass-manufacturing-controlling-thermal-conductivity-in-fused-silica/). A related standard product is [Custom Ultra-Thin Quartz Glass Disc](https://machiningglass.com/products/custom-ultra-thin-quartz-glass-disc/).

## FAQ

### What is the Round Transparent Borosilicate Glass Polished High Temperature Borosilicate Glass Sheet High Precision B270 Optical Glass made of?

It is listed as Bk7 / Quartz / K9 Glass. Coating: UV-pass UV passband filter. Other grades can be quoted if your application needs different transmission, thermal or chemical properties.

### Where is this precision glass plate / sheet used?

Listed applications: Rubber, Plastic, Chemical, Construction, Metallurgy, Ceramic, Casting and Glass.

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

Include material, outline and thickness, holes, slots and features, edges and surface, 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=12602#mg-rfq

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