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GFRC: material and technology

What is GFRC? GFRC is glass fibre reinforced concrete, also known as GRC; in Russia it is called SFB (steklofibrobeton). According to TECHNOFORMA, it consists of four components — glass fibre, sand, high-grade cement and water; it is non-combustible (class NG under Russian standards), highly frost-resistant and can be cast into almost any shape.Articles in this section explain how the material works and how it is made — by spray-up and vibration casting, its strength, density and weight and how these affect the load on a facade, and where its strengths and limitations lie. A separate series compares GFRC with fibre-reinforced concrete, polymer concrete, polyurethane, foam plastic, gypsum, architectural concrete and natural stone, so you can make an informed choice.If you need elements for a specific project, go to the GFRC: element manufacturing page.

Architectural Concrete and GFRC: The Differences

GFRC: material and technology

Architectural Concrete and GFRC: The Differences

Architectural concrete is concrete whose surface stays exposed and serves as the finish itself: no render, paint or cladding. The main requirement is the quality of the face: even colour, a specified texture, crisp arrises, a minimum of blowholes and formwork marks. It is used in in-situ walls, precast panels, stairs, street furniture and facade ornament.Glass fibre reinforced concrete (GFRC) is a closely related special case: it is also concrete with an exposed face, but reinforced with alkali-resistant glass fibre, which makes thin, light elements possible. If you need massive in-situ work or a load-bearing element, choose architectural concrete; if you need lightweight cladding panels and ornament, choose GFRC.A general overview of GFRC is in GFRC: material and technology.

GRC, GFRC and SFB: Names for Glass Fibre Reinforced Concrete

GFRC: material and technology

GRC, GFRC and SFB: Names for Glass Fibre Reinforced Concrete

GRC panels are facade panels made of glass fibre reinforced concrete: the abbreviation GRC (Glassfibre Reinforced Concrete) is used internationally for the same material that in Russia is called SFB. In the USA the variant GFRC (Glass Fiber Reinforced Concrete) is more common. In every case it means fine-grained concrete reinforced with alkali-resistant glass fibre.When choosing GRC panels, what matters is not the name but the mix design, the forming method and properties confirmed by testing. Different terms in catalogues and designs do not mean different materials, but foreign projects often refer to their own standards, and these have to be translated correctly into Russian requirements.This article is for architects working with international references and for procurement specialists. For a general overview of the material, see GFRC: material and technology.

GFRC Textures: Smooth, Stone-Look, Acid-Etched

GFRC: material and technology

GFRC Textures: Smooth, Stone-Look, Acid-Etched

GFRC (glass fibre reinforced concrete) textures are the face finishes of products: smooth, stone-look, acid-etched, sandblasted, relief or timber-look. Texture is built into the mould when it is made or created by surface treatment after demoulding. Thanks to its fine-grained mix, GFRC reproduces the mould pattern accurately, down to fine details.The main criterion for choosing a texture is the architectural concept and service conditions: a smooth surface looks more austere and shows dirt more, while a textured one hides minor irregularities better and ages more gracefully. The decision is always confirmed on samples.This article is useful for architects and clients at the finish selection stage. For a general overview of the material, see GFRC: material and technology.

GFRC Colour: Integral Pigmentation vs Facade Painting

GFRC: material and technology

GFRC Colour: Integral Pigmentation vs Facade Painting

The colour of glass fibre reinforced concrete (GFRC) is set in one of two ways: the mix is coloured integrally with mineral pigments, or the finished element is coated with facade paint. Without pigment, GFRC has the natural grey or light colour of cement; with white cement and light sand it is almost white, close to limestone.The main selection criterion is not the shade in a catalogue but how the colour behaves over the years: integral colour does not peel and does not show at chips, while paint gives an exact colour match and saturated tones but needs periodic renewal. Architects should decide which option to specify at the sketch stage, because it determines the mix design, mould layout and facade maintenance schedule.General information on the material is collected in GFRC: material and technology; this article covers colour only.

GFRC Facade Panels

GFRC: material and technology

GFRC Facade Panels

Glass fibre reinforced concrete (GFRC) panels are thin-walled facade elements made from a cement-sand mix reinforced with alkali-resistant glass fibre. Thanks to dispersed reinforcement, with a face skin of around 10–20 mm they withstand wind and thermal loads while weighing several times less than conventional concrete or natural stone of the same area.The main selection criterion is not the price per square metre but the panel's compatibility with the fixing system and facade geometry: size, thickness, cast-in fixings and permissible deformations must be calculated together with the substructure. The material is chosen by architects and developers who need a facade with relief, large formats or a "stone" texture, while achieving non-combustible class NG under Russian standards.For the structure and properties of the material itself, see GFRC: material and technology.

3D Panels and Parametric GFRC Facades

GFRC: material and technology

3D Panels and Parametric GFRC Facades

3D facade panels are cladding elements with volumetric relief — waves, facets, pyramidal and curved surfaces that change the facade pattern depending on the light. Combined with digital design, they are used to build parametric facades in which every panel can differ in shape from its neighbour.Glass fibre reinforced concrete (GFRC) suits such tasks because it is a mouldable material: the mix follows any mould surface, and the thin reinforced skin keeps weight low even with deep relief. The main selection criterion is how many unique moulds the project will require: this affects lead times and cost more than the area does.The solution appeals to architects and developers who want an expressive facade that is non-combustible (Russian class NG). Basic information on the material is in GFRC: material and technology.

GFRC in Interiors

GFRC: material and technology

GFRC in Interiors

Glass fibre reinforced concrete (GFRC) in interiors means thin-walled panels, columns, portals, fireplaces, stair cladding and decoration cast from a cement mix with glass fibre. The material looks like concrete or natural stone but weighs noticeably less, does not burn and can reproduce almost any shape and texture.The main selection criterion for interiors is weight and the fixing method for the specific substrate: partition walls, plasterboard and framed walls carry less than solid concrete. The second criterion is texture and protecting the surface from stains.The solution is chosen by designers and architects of public interiors — lobbies, halls, restaurants, hotels — as well as private homeowners. More about the material in GFRC: material and technology.

GFRC Street Furniture and Small Architectural Forms

GFRC: material and technology

GFRC Street Furniture and Small Architectural Forms

Small architectural forms made of glass fibre reinforced concrete (GFRC) are planters, plant pots, benches, parapets, railings, litter bins, fountains, decorative objects and other landscaping elements cast from a cement mix reinforced with glass fibre. The material combines the look of concrete or stone with a thin wall and low weight, so a large object can be delivered and moved without heavy machinery.The main selection criterion is purpose and load: a decorative vase and a bench in a residential courtyard work under different conditions, and the design of the element (thickness, ribs, cast-in inserts, fixing to the base) must match actual use. The second criterion is the number of identical items: a series pays for the mould, while a one-off object to a custom sketch costs more.Such elements are ordered by developers, property management companies, landscape architects and private owners. Material basics are in GFRC: material and technology.

DIY GFRC: What You Can Realistically Make and Where the Limits Are

GFRC: material and technology

DIY GFRC: What You Can Realistically Make and Where the Limits Are

You can make glass fibre reinforced concrete (GFRC) yourself, but only for small, non-structural items: garden planters, decorative tiles, worktops, small interior décor. You need alkali-resistant glass fibre, cement, fine sand, a plasticiser and a mould; the mix is poured or applied by hand in layers.The main limitation is consistency of properties. In a factory, the strength, frost resistance and geometry of every element are ensured by mix design, equipment and quality control, whereas at home nobody tests them. That is why facade elements that hang over people, are fixed to a substructure and must comply with the design cannot be improvised.This article is for self-builders and craftspeople who want to understand the limits of doing it themselves. More about the material in GFRC: material and technology.

GFRC Moulds: Silicone, Plastic, Timber

GFRC: material and technology

GFRC Moulds: Silicone, Plastic, Timber

Moulds for glass fibre reinforced concrete (GFRC) are the forms in which the mix takes on the final geometry and texture of the element. They are made of silicone and polyurethane (for relief and texture), plastic, fibreglass and acrylic sheet (for smooth and large surfaces), laminated plywood and timber (for simple geometry and small runs), and metal for mass production.The main criterion for choosing mould material is the combination of relief complexity and run size: the more undercuts and fine details, the more a flexible mould is needed; the more identical elements, the more cost-effective a durable mould with a long life.This article is for architects, clients and technologists who need to understand what drives element lead times and cost. General information on the material is in GFRC: material and technology.

GOST Standards and Codes for GFRC

GFRC: material and technology

GOST Standards and Codes for GFRC

The main national standard for glass fibre reinforced concrete (GFRC) products in Russia is the Russian standard GOST R 58757-2019, which manufacturers and designers refer to; before applying it, check its status and current edition in the official standards register. In addition, GFRC products are covered by general standards for concrete and its test methods, and facades as a whole by codes of practice (SP) on loads, fire safety and rainscreen facade systems.The main criterion for the client is not the standard number in a presentation but the documents for the specific product: the technical specifications (TU) or standard under which it is manufactured, the product data sheet and test reports. These are what confirm strength, frost resistance and fire performance.This article is useful for designers, technical supervision and procurement teams. General information on the material is in GFRC: material and technology.

The History of GFRC and Its Use Worldwide

GFRC: material and technology

The History of GFRC and Its Use Worldwide

The history of glass fibre reinforced concrete (GFRC) begins in the second half of the 20th century: attempts to reinforce cement with ordinary glass fibre failed because the alkaline environment of cement stone destroyed the fibre. The breakthrough came when alkali-resistant glass fibre with added zirconium dioxide was developed in the UK; after that, the material known worldwide as GRC or GFRC went into industrial production.Today GFRC is a standard solution for facades with complex sculpting, restoration of historical décor and parametric architecture. The key lesson from its history is that the material's reliability depends on the alkali resistance of the fibre and the quality of production, so you should choose a proven manufacturer, not just an eye-catching form.This article is for architects and anyone who wants to understand where the material came from. Properties are covered in detail in GFRC: material and technology.

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