Glass wool, also known as fiberglass insulation, is made by melting glass and other minerals with a significant percentage of recycled content. This melt is then converted to resilient fiber form. The glass wool insulation is lightweight and can be used upto a service temperature of 230oC. It can be used in all general-purpose applications such as pre-engineered building, commercial building, drywall partition, HVAC and automobile.
Also known as Mineral Wool Marine Board (MWMB) / Mineral Fiber Resin Board (MFRB)
With a service temperature ranging from sub-zero to +230oC, glass wool can be used for cryogenic applications, pre-engineered buildings (PEB), commercial buildings, HVAC, mobility and transportation, infrastructure and more.
With multiple benefits to offer, glass wool is used in ceiling (underdeck, overdeck), wall, partition, façade, duct, acoustic walls, auditoriums, theatres to name a few.
Fiberglass insulation has a
laminar structure with
interconnected air pockets.
This creates adequate
resistance to the air flow
path, thereby reducing
heat
and sound transmission.
The uniformly distributed fibers are cured in an oven with a binder and converted to boards and rolls of required density, and dimensions. Factory applied facings on one side or both sides of the insulation are then applied to suit the application requirements.
BATCH
Sand, soda ash, limestone and recycled glass are stored in silos, weighed, mixed and poured into a furnace.
FIBERIZING
The liquid glass is propelled by a centrifugal spinner to create the fibers. These are sprayed with a binder and shaped into a blanket.
CURING
The blanket passes through a curing oven where it is compressed to achieve its final thickness.
CUTTING
The blanket is cut to the required width. Off-cuts are recycled. A facing can eventually be glued to the blanket.
Sand, soda ash, limestone and recycled glass are stored in silos, weighed, mixed and poured into a furnace.
The mixture is melted at high temperature in an electric or gas furnace.
The liquid glass is propelled by a centrifugal spinner to create the fibers. These are sprayed with a binder and shaped into a blanket.
The blanket passes through a curing oven where it is compressed to achieve its final thickness.
The blanket is cut to the required width. Off-cuts are recycled. A facing can eventually be glued to the blanket.
The end of the line is equipped with a rolling machine for mats and a stacking machine for boards.
The glass wool can be compressed to up to a tenth of its volume. Multiple rolls of glass wool can be packed onto a single pallet.
Glass Wool is one of the most sustainable insulation materials available. It is manufactured using recycled glass and natural sand, has low embodied carbon, and is fully recyclable at the end of its life. It contributes significantly to green building certifications and circular economy goals.
Yes, Glass Wool can be used in humid environments when properly enclosed or coated. However, in highly corrosive industrial settings, additional protective layers or vapor barriers may be recommended to prevent moisture ingress and ensure long-term performance.
Selection depends on application type—whether it's HVAC, wall insulation, roofing, or industrial piping. Factors like thermal resistance (R-value), fire rating, acoustic needs, and environmental conditions should be considered. Saint-Gobain’s technical team can assist with tailored recommendations.
Glass Wool typically offers an R-value ranging from 2.2 to 3.5 per inch, depending on density and thickness. It provides consistent thermal performance over time, making it ideal for energy-efficient insulation systems.
Glass Wool can withstand temperatures up to 250°C without degradation. For applications requiring higher thermal resistance, specialized products or mineral wool alternatives may be recommended.
Saint-Gobain Glass Wool complies with IS 8183, EN 13162, and other international standards for thermal insulation. Products are also tested for fire safety, acoustic performance, and environmental impact, ensuring full regulatory compliance.
Yes. Glass Wool is recyclable and can be reprocessed into new insulation products or other glass-based materials, supporting circular economy principles and reducing landfill waste.
While Glass Wool performs well in moderate to low temperatures, in cryogenic or sub-zero industrial applications, materials like cellular glass or specialized foams may offer better thermal stability and moisture resistance.
Glass Wool is naturally water-repellent but not waterproof. It resists moisture absorption better than organic materials but may require vapor barriers in high-humidity or condensation-prone environments to maintain performance.
Proper installation includes ensuring full coverage without gaps, using appropriate facings or vapor barriers, and securing the material to prevent sagging. For acoustic applications, maintaining air gaps and avoiding compression are key to optimal sound absorption.
By reducing heat gain and loss, Glass Wool improves building envelope performance, allowing for more efficient HVAC system sizing. This leads to lower energy consumption, reduced operational costs, and improved indoor comfort.
Glass Wool is non-combustible and helps contain fire spread by resisting ignition and slowing heat transfer. It plays a critical role in passive fire protection systems, supporting compliance with fire safety regulations and enhancing occupant safety.