GMB Glasmanufaktur Brandenburg

What GMB Glasmanufaktur Brandenburg does

GMB Glasmanufaktur Brandenburg GmbH is a German manufacturer of low-iron solar glass and specialty glass, operating a single production site at Spremberger Strasse 4 in Tschernitz, Germany. The company's core products are high-performance solar glass for photovoltaic modules and solar thermal collectors, plus a sub-line of specialty glass for greenhouse applications. The glass is produced using low-iron formulations sourced exclusively from Interfloat Corporation in Liechtenstein, with which GMB shares shareholders and maintains a strategic production and R&D partnership dating to 1982. Technical differentiation rests on long-tenured specialty glass manufacturing know-how, ISO 9001 quality and ISO 50001 energy management certifications, TÜV Rheinland product certification, and energy-efficiency investments such as thermal waste gas purification that has reduced energy demand by 16.79%.

GMB operates a B2B enterprise sales model, selling directly to European photovoltaic manufacturers, solar thermal system makers, and greenhouse builders. Pricing is not publicly disclosed and is handled through custom enterprise contracts. The company was acquired in October 2022 by India's Borosil Renewables Limited, which holds 86% of shares; the remaining 14% is held by Blue Minds Company. Headcount is reported in the 101-250 range. The company has been recognized at the European level, including the EUROSOLAR European Solar Prize in 2016.

The company is currently in financial distress. Borosil Renewables recorded ₹213.41 crore in exceptional items tied to insolvency proceedings and the deconsolidation of GMB and a sister German entity, Geosphere Glassworks. A rescue bid for GMB failed in November 2025, although the company website remains active. GMB's operating status is therefore best characterized as distressed or in administration, with material uncertainty around continuity of production, customer relationships, and the integration of the Tschernitz site into any successor ownership structure.

Name

GMB Glasmanufaktur Brandenburg

Legal name

GMB Glasmanufaktur Brandenburg GmbH

Website

https://gmb-glas.de

Company type

Private

Founded year

2007

Operating status

Operating

Headcount range

101–250 employees

Short description

GMB Glasmanufaktur Brandenburg GmbH is a German manufacturer of low-iron solar and specialty glass, operating a single site in Tschernitz, Germany, serving European photovoltaic, solar thermal, and greenhouse customers. It has been 86% owned by India's Borosil Renewables since 2022 and entered insolvency in 2025.

Ownership category

akta.pro rank

Product category

Solar Glass Manufacturing

NAICS

Flat Glass Manufacturing (327211), Glass and Glass Product Manufacturing (32721)

SIC

Flat Glass (3211), Glass Products, Made Of Purchased Glass (3231)

akta.pro primary industry

Solar Plant Components Supply & Manufacturing (Modules, Cells, Wafers, Mirrors, Heliostats) (EUACAGAK)

akta.pro secondary industry

Skylights, Roof Glazing & Glass Roofing Systems (IMADAHAK)

Keywords

• Solar glass manufacturing
• Low-iron float glass
• Photovoltaic cover glass
• Solar thermal glass
• Greenhouse glass

Headquarters

HQ city

Tschernitz

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Operations, Supply Chain, Personnel, Infrastructure, Technology or R&D

Revenue model

1. Solar Glass Sales: Manufacture and sale of solar glass and specialty glass products to the European solar industry, including photovoltaic and solar thermal applications, as well as greenhouse specialty glass

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

GMB Glasmanufaktur Brandenburg manufactures low-iron, high light-transmittance patterned float glass at its Tschernitz (Brandenburg, Germany) plant. Its core products are cover glass for photovoltaic modules, cover glass for solar thermal collectors, and specialty patterned glass for greenhouse applications, sold to European solar and horticultural customers.

Product overview

GMB Glasmanufaktur Brandenburg GmbH produces high-performance solar and specialty glass products. The company manufactures low-iron solar glass exclusively sourced from Interfloat Corporation, serving the European solar industry. Their product portfolio includes High Performance Solar Glass for photovoltaic and solar thermal systems, as well as specialty glass for greenhouse applications. The products are produced at their factory in Tschernitz, Germany, and are tailored to meet current market demands.

Differentiator

Problem solved

Functional benefit

Products and services

• High Performance Solar Glass for Photovoltaic Systems Low-iron, high light-transmittance patterned float glass produced as front cover glass for photovoltaic (PV) modules, sold to European solar module manufacturers.
• High Performance Solar Glass for Solar Thermal Systems Low-iron, high light-transmittance patterned float glass used as cover glass in solar thermal collectors, marketed to manufacturers of solar thermal energy systems.
• Specialty Glass for Greenhouses Patterned float glass with light-diffusing surface designed for greenhouse construction and horticultural applications, supplying greenhouse builders and operators with durable, high-transmittance horticultural glass.

Quantifiable outcome

• Energy demand reduction of 16.79% achieved through thermal waste gas purification process
• +1 more outcomes

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature2 records

Partnerships

One partnership is on record.

• Interfloat CorporationcoreStrategic or Co-development Partner · 1 January 1982Interfloat Corp. has been a household name for industry insiders as a supplier to the European solar industry since 1982. As the first ever European importer of solar glass, Interfloat has continuously invested in the research and development of innovative products, novel glass structures and high-performance coating technology. GMB operates as the production site and reliable innovative partner of Interfloat Corp. under the same shareholder relations.

Scale indicators3 records

Recent moves6 records

Expansion highlights4 records

Market position

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about GMB Glasmanufaktur Brandenburg