Glass Fibre Reinforced Gypsum (GFRG)

A new concept of material was found in England in 1977: a product now known as Glass Fibre Reinforced Gypsum, also Referred to as Fibreglass Reinforced Gypsum (GFRG) and Glass Reinforced Gypsum (GRG).

This included gypsum plaster Reinforced with glass fibres to produce a thin, lightweight, yet strong material. GRG is for use where it is not subject to Dampness. GRG can be used wherever a light, strong, and fire retardant material is required (casinos, hotels, theaters, Residential, etc.) in many shapes and products ( Moldings, Ceilings, Columns, Light coves, Bas Relief, Domes, Capitals, Fireplace Surrounds, Medallions, Custom shapes, etc) .


Gypsum is suitable for reinforcement with common E-glass fibres. Unlike cement, gypsum is not high in alkaline and does not Generate lime during cure, the main reason why alkaline resistant (AR) fibres are used in glass fibre reinforced cement, GRC.

Gypsum therefore has in this respect an enormous advantage compared with unmodified cement matrixes. However, a disadvantage of gypsum is its poor weather resistance. Because of this, unmodified gypsum is only suitable for Indoor application, Research programs have shown that Modified GRG has a very good mechanical and physical property which enables the material to be used for a wide range of applications. The material shows improved weather resistance which makes It possible to use the product outdoors. The material has already been used successfully for manufacturing architectural

Cladding panels, decorative ornamentation, and column covers, flowerpots, etc

Because of its unique properties:

·     Flame Resistant:

GRG is a mineral and will not burn. In addition, the nature of gypsum acts like a thermal regulator when exposed to flame. GRG not only will not burn, but it also protects the materials behind it from the heat of the flame for up to two hours.

·     Easy Installation:

GRG is relatively light in weight compared to traditional stone or plaster ornaments. Its installation is quick and relatively easy.

·     Selection:

GRG can be casted to virtually any shape.

·     Finishing:

GRG is available in a white color and is easily finished with virtually any paint.


The most reliable method to establish the durability of a material is to monitor its behavior in practice. However, this is not feasible for potential manufacturers. Therefore, accelerated ageing tests are also desirable to predict long term behavior but of course they can never be a 100% guarantee for the actual behavior. Accelerated ageing tests are performed by:


Since gypsum is not alkaline and after setting and curing will not develop further crystals due to continuing hydration or other processes it is to be expected that there will be no degradation of the E-glass fibres by a chemical or mechanical attack in the gypsum matrix and that the bonding of glass fibres in the gypsum matrix remains constant.

It is known that unmodified gypsum loses strength completely when it absorbs water and is water soluble. Therefore various test programs have been performed, while others are ongoing to determine that long-term performance of M-GRG Particularly the weather- and water-resistance of the material Knowledge of long-term performance of new materials is very important for engineers and designers.