---
title: Leneta black glass panels | Novamart AG
url: https://novamart.ch/en/brands/leneta/leneta-special-substrates/leneta-black-glass-panels/
language: en-GB
---

# Leneta black glass panels | Novamart AG

> Leneta black glass panels for hiding power testing to ASTM D2805. At Novamart AG.

LENETA - Black glass panels

- [Novamart AG](https://novamart.ch/en)
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- [Partner](https://novamart.ch/en/brands/)
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- [Leneta](https://novamart.ch/en/brands/leneta/)
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- [Leneta special substrates](https://novamart.ch/en/brands/leneta/leneta-special-substrates/)
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- Leneta black glass panels

# Black glass panels

Black glass is used in the widely referenced, high-precision ASTM method D 2805 and related opacity testing methods. According to the **Measurement of the reflectance R0 of the dry film** a certain area is scraped off the glass and weighed to determine the propagation rate ( **spreading rate** ) or the original **Wet film thickness** to be determined. R∞ of the colour film is determined by a separate test application. The opacity is then determined using the corresponding **Kubelka-Munk equations** calculated using the ASTM method.

Black glass plates are used in U.S. Federal Test Method 141-4122 and CGSB Method 1-GP-71-14.7 to measure hiding power. The latter method also provides for direct measurement of wet film thickness with a wet film thickness gauge as described in ASTM Method D 1212.

These methods depend on the unique hardness and flatness properties of glass substrates. Although it is not as optically opaque as real Carrara glass, it has **Leneta Black Glass has a Y-reflectance of less than 1 %** and is therefore a suitable substitute for Carrara glass.

- [Mould GB-3A Black glass panel](https://novamart.ch/en/product/form-gb-3a-black-glass-panel/) The GB-3A article is used in the widely referenced, high-precision ASTM method D 2805 and related opacity test methods. 200 x 200 mm.
- [Mould GB-3B Black glass panel](https://novamart.ch/en/product/form-gb-3b-black-glass-panel/) The GB-3B article is used in the widely referenced, high-precision ASTM method D 2805 and related opacity test methods. 200 x 300 mm.

### For **Enquiries, orders** or **Product samples** please contact us:

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Novamart AG, Rosenbergsaustrasse 7, 9434 Au SG, Schweiz. Telefon +41 71 228 88 33, info@novamart.ch. Übersicht für Agenten: https://novamart.ch/llms.txt