Foam glass: pros and cons, service life and reviews

When it comes to foam glass, pros and cons this insulation cannot be disassembled in isolation from the technology. "Foam glass ETIZ" is a 100% mineral material: it is foamed by a cold mechanical method from sodium liquid glass with the addition of a foaming agent and a hardener. There are no resins, formaldehyde and polymers in the composition, so the plates do not smell, do not emit toxic gases and are considered environmentally friendly. It is important to immediately fix: the structure of the steam glass ETHYZ open porous is not a classic closed-porous block foam glass of the Foamglas type, and it will behave differently with moisture.

What is foam glass and where it is used

Foam glass is a rigid non-combustible insulation in the form of plates and panels for heat and sound insulation. This is not a composite sheet or reinforcement, but a heat-insulating material. It is laid when insulating walls, roofs, floors and foundations, mounted as acoustic ceilings and used in wet and fire hazardous areas where conventional insulation does not work well.

The ETIZ line covers different tasks: "Thermo" (thermal insulation, density 150 kg/m³), "Standard", structural "Strong" (compressive strength up to 36 t/m²) and ceiling panels "Acoustic NG" 600×600 mm. Plates are produced in formats 500×500, 550 × 550 and 600×600 mm with thicknesses of 50, 60, 100 and 120 mm. You can choose the standard size for the project in catalogue of ETHYZ steaming glass.

Advantages of foam glass: what it is valued for

The strengths of the material are built around durability and fire safety — this is what distinguishes it from mass insulation.

• Non-flammable All components are non-combustible: NG flammability group, fire hazard class KM0. The material does not emit toxic gases, does not sinter and does not precipitate when heated. The fire resistance limit of the 50 mm layer is about 71 minutes, the 100 mm layer is about 95 minutes. Temperature resistance up to ~950 °C, operating limit up to 750 °C.
• The service life is more than 100 years. The mineral base does not age like organic matter: the steam glass does not shrink, does not sag and does not lose its shape over time.
• Eco-friendliness. Resin, formaldehyde and polymer free, odourless. Suitable for rooms with high environmental requirements.
• Strength The brand "Strong" holds up to 36 t/m² for compression — it can be loaded under constant load without a frame, for example, under a screed or a loaded floor.
• Biostability. Glass is not food: foam glass does not bite mice and rats, fungus and mold do not start in it, it does not rot.
• Acoustics. Sound absorption of the highest class "A" — panels "Acoustic NG" work as ceiling sound insulation.
• Installation without cold bridges. Rigid plates are butt-jointed, the layer is smooth and stable.

Cons & Limitations: Fair

There are no ideal insulants, and about foam glass pros and cons need to know equally. The main limitation of ETHYZ steam glass is associated with an open-porous structure.

• Does not absorb any moisture. Open pores receive water: with an increase in humidity by +1%, the thermal conductivity increases by about 0.0025 W/(m·K). But the material is reversible — with natural ventilation, it completely dries out and restores its shape and characteristics. It is impossible to attribute absolute water resistance to ETIZ steam glass: in wet areas, ventilation or protection against direct soaking is required.
• Weight. The mineral slab is heavier than foam and mineral wool, this should be taken into account in the design and logistics.
• The price is higher than foam. Foam glass is more expensive than cheap polystyrene foam — but they are incomparable in terms of service life and fire safety. Project specific cost — on request.

Foam glass against mineral wool and polystyrene foam

In order for the decision to be weighted, we will compare the material with the two most frequent alternatives. Values for competitors are given tentatively and qualitatively.

The conclusion is simple: mineral wool is lighter, but it is afraid of moisture and caking; polystyrene foam is cheaper and is not afraid of water, but it is combustible, afraid of fire, UV and rodents. Steamed glass ETIZ wins in terms of non-combustibility, durability and biostability, but for this they pay a lot of weight and the need for ventilation in wet units. To insulate the walls and assess the thickness equivalent, it is convenient to check with eTHYZ catalogue: a layer of foam glass about 10 cm in terms of thermal protection is comparable to a brick wall about a meter (according to the manufacturer).

Lifetime of foam glass

The declared service life of ETIZ steam glass is more than 100 years. This is not a marketing roundness, but a consequence of the mineral nature: the material has nothing to rot, oxidize and decompose, it does not fade in the sun and is not afraid of temperature changes within the operation range of up to 750 °C. The key condition for durability is the correct unit: if ventilation is provided in the wet area and there is no constant soaking, the plate gets wet and dries cyclically without loss of shape and heat engineering. That is why competent installation is more important than the material itself: a dry, ventilated structure serves for decades without repairing the insulation.

Reviews of foam glass: what they say in practice

Generalized feedback on the operation of steam glass (without reference to specific names) converges in several points.

• Firefighters and designers appreciate the class NG/KM0 — at facilities with strict requirements for fire safety, this eliminates coordination issues.
• Builders note the rigidity of the plates and the end-to-end installation without cold bridges, as well as the fact that the material does not crumble and holds the geometry.
• Owners of private houses praise the absence of rodents and odor and are calm for longevity.
• Critics Reviews most often it concerns the weight and price relative to the foam, as well as the requirement to think through ventilation in wet nodes — this is expected for an open-porous material and is decided at the design stage.

If you look objectively at foam glass, the pros and cons are balanced for a specific task: where non-combustibility and service life are most important, the material closes the question for a long time; where the minimum weight and price come first, the choice may be different. The technical certificates of the Ministry of Construction of the Russian Federation, fire safety certificates and eco-inclusions confirm the declared characteristics.

FAQs

Does foam glass absorb water or not?

ETHYZ steam glass has an open porous structure, so it absorbs moisture: with an increase in humidity by 1%, the thermal conductivity increases by about 0.0025 W/(m·K). But this is reversible — with natural ventilation, the material completely dries out and restores its shape and characteristics. This is not closed porous block foam glass, so ventilation or protection against direct soaking is needed in wet areas. Absolute water resistance should not be attributed to the material.

How much does foam glass serve?

The declared service life of ETIZ steam glass is more than 100 years. The material is mineral, it has nothing to rot and oxidize, it does not shrink and does not sag, does not burn out in the sun and can withstand operation up to 750° C. The main condition for durability is the correct unit with ventilation in wet areas: a dry ventilated structure serves for decades without repairing the insulation. Proper installation here is more important than the material itself.

What are the main pros and cons of foam glass?

Pros: non-combustibility (group NG, class KM0), service life more than 100 years, environmental friendliness without resins and formaldehyde, strength up to 36 t/m² at the brand "Strong", it is not gnawed by mice, there is no shrinkage and cold bridges, high sound absorption class "A". Cons: The open porous structure absorbs moisture and requires ventilation in wet areas, the material is heavier than cotton wool and foam, and the price is higher than cheap polystyrene foam.

Is foam glass burning?

No. Steam glass ETIZ belongs to the flammability group of the NG and the fire hazard class KM0 — all its components are non-combustible. It does not emit toxic gases when heated, does not sinter, and does not precipitate. The fire resistance limit of the 50 mm layer is about 71 minutes, the 100 mm layer is about 95 minutes. Temperature resistance up to ~950 °C. Therefore, the material is used in fire hazardous areas and at facilities with strict fire safety requirements.

Which is better — foam glass, mineral wool or foam plastic?

Depends on the priority. Mineral wool is lighter and slightly warmer, but is afraid of moisture and cakes over time. Styrofoam is cheaper and moisture resistant, but combustible (G3-G4), afraid of fire, UV and rodents. ETIZ steam glass wins in terms of non-combustibility, service life and biostability, but it is heavier and requires ventilation in wet units. For non-combustible and durable solutions, foam glass is chosen, for minimum weight and budget — alternatives.

How much does ETHYZ foam glass cost?

The price depends on the line, size and volume of the batch, so it is calculated on request. The ETIZ catalog includes the Thermo, Standard, Strong structural and Acoustic NG ceiling panels in 500×500, 550 × 550 and 600×600 mm formats with thicknesses from 50 to 120 mm. For an accurate calculation for the project, specify the task, the required layer thickness and volume — the manager will select the brand and calculate the cost.