Glass Wool Insulation
Langfang Henggang Energy Saving Technology Co., Ltd. supplies glass wool insulation in three product forms — glass wool board, glass wool pipe sections and glass wool blanket — for thermal and acoustic duty in buildings, HVAC systems and industrial plant. Boards and blankets are supplied faced or unfaced; pipe sections are preformed and pre-slit so they snap over the pipe on site. Every product in the range is classified A1 non-combustible to GB 8624, and each form is manufactured to the ASTM or EN product specification that applies to it.
Choosing Between Board, Pipe Section and Blanket
The three forms are made from the same material and carry the same fire and thermal classification. The decision is about shape, rigidity and installation labour rather than performance.
|
Consideration |
Glass wool board |
Glass wool pipe section |
Glass wool blanket |
|
Form |
Rigid slab |
Preformed cylinder with a slit |
Flexible roll |
|
Typical density |
24–96 kg/m³ |
48–100 kg/m³ |
10–48 kg/m³ |
|
Best for |
Walls, ceilings, ducts, equipment, acoustic panels |
Hot and chilled pipework |
Large areas, irregular shapes, wrap, OEM |
|
Installation |
Cut and butted, pinned, adhesively fixed |
Snapped over the pipe, no site cutting |
Wrapped and secured with banding or wire |
|
Facing options |
FSK, ASJ, foil, kraft, wire mesh |
ASJ, FSK, foil |
FSK, ASJ, foil, kraft, wire mesh |
|
Compression behaviour |
Holds shape under load |
Holds shape under load |
Compresses to conform |
|
Thickness control |
Factory thickness, uniform |
Factory wall thickness, uniform along the run |
Nominal thickness — state installed thickness if critical |
What Is Glass Wool Insulation?
Glass wool insulation — also called fiberglass insulation in North America — is a fibrous thermal and acoustic insulation made from sand and recycled glass, melted at around 1,100–1,400 °C, drawn into fibres and bonded with a thermosetting resin into boards, preformed pipe sections and blankets. The insulation value comes from the still air held between the fibres; the fibre structure exists only to trap that air and stop it circulating.
Three properties explain why glass wool is specified so widely:
Low thermal conductivity
Typically 0.032–0.044 W/(m·K) at 25 °C mean temperature, so a practical thickness delivers a high thermal resistance.
Non-combustible
Glass wool is classified A1 non-combustible to GB 8624 and passes non-combustibility testing to EN ISO 1182. The glass fibres themselves soften only above about 600 °C.
Sound absorption
The open, fibrous structure absorbs airborne noise, which is why glass wool is used in plant rooms, on ductwork and inside partition walls as much for acoustics as for heat.
Glass Wool Board
Glass wool board — also written glass wool panel or glass wool insulation board — is the rigid form of glass wool: a dimensionally stable slab that holds its own shape against the wall or around the equipment instead of needing a support grid to stay in place. Boards are the right choice where the insulation is exposed to view, where it has to carry a load, or where a flat, clean surface is part of the requirement.
Typical applications of glass wool board:
Exterior and interior walls, ceilings and partitions, for thermal and acoustic performance
01
Ductwork exteriors and internal duct liners, including acoustic liners for supply and return ducts
02
Equipment, vessels, tanks and large-diameter pipe cladding
03
Plant rooms, chiller rooms and generator rooms where noise control matters
04
OEM products that need a cut, grooved or laminated glass wool core
05
Glass Wool Pipe Sections
Glass wool pipe insulation — normally supplied as a glass wool pipe section, also called preformed pipe insulation — is manufactured as a hollow cylinder with a longitudinal slit, so it opens and snaps over the pipe. The section is produced to the pipe outside diameter, which means the wall thickness is controlled by the factory rather than on site: the thermal performance is uniform along the entire run, and the joint closes properly, which is exactly what a wrapped solution cannot guarantee.
Hot Service
On steam, condensate and hot-water pipework the pipe section is installed directly over the pipe and secured with the self-adhesive lap, then finished with a jacket. Because glass wool pipe sections are dimensionally stable and non-combustible, they suit boiler rooms, heat distribution mains and process pipework within the temperature limit of the product.
Cold Service
On chilled-water and refrigerant pipework the same section is used, but with a factory-applied vapour retarder facing and every joint, lap and end sealed. On cold service the facing is the critical component: unsealed, moisture migrates into the insulation, the k-value rises and the pipe starts to sweat. This is the single most common installation failure on cold systems, and it is worth specifying the closure method explicitly.
Glass Wool Blanket
Glass wool blanket — also supplied as glass wool roll or glass wool felt — is the flexible form: low density, supplied in rolls, faced or unfaced, and designed to be wrapped rather than fitted. Blankets are the economical answer wherever the surface area is large, the geometry is awkward, or the insulation simply has to conform to whatever it is covering.
Where a glass wool blanket earns its place:
Large areas
Low density with a high thermal resistance per kilogram makes blanket the most economical option for roofs, walls and ceilings over long runs.
HVAC duct wrap
The standard external wrap for rectangular and round ductwork, usually with an FSK facing.
OEM conversion
Rolls are supplied to your cutting plan in the width and length you need, which keeps offcut waste down on volume production.
Application Selection Guide
|
Application |
Recommended form |
Notes |
|
Building wall, roof and ceiling cavity |
Blanket or board |
Blanket for framed cavities; board where the surface must stay flat |
|
HVAC duct exterior |
Blanket or board |
Blanket for wrap; board for rigid, clean edges |
|
Internal duct liner (acoustic) |
Board or blanket with facing |
Facing protects the fibre from the air stream |
|
Hot water and steam pipework |
Pipe section |
Match density to ASTM C547 Type I where it is specified |
|
Chilled water and refrigerant pipework |
Pipe section with ASJ |
Vapour retarder facing and sealed joints are essential |
|
Storage tanks, vessels, large ducts |
Blanket (wrapped) or board |
Blanket for fast coverage; board for a rigid finish |
|
Equipment and plant-room acoustics |
Board |
Higher density gives better sound absorption |
|
OEM lamination and cut parts |
Board or blanket |
Cut, groove and laminate to your drawing |
Design Standards and Compliance
ASTM C612 — Mineral Fiber Block and Board Thermal Insulation: the reference specification for glass wool board.
ASTM C547 — Mineral Fiber Pipe Insulation: the reference specification for preformed glass wool pipe sections. Type I requires a minimum density of 48 kg/m³ (3 pcf) for service up to 850 °F (454 °C).
ASTM C553 — Mineral Fiber Blanket Thermal Insulation for Commercial and Industrial Applications: the reference specification for glass wool blanket.
ASTM C411 — hot-surface performance of the insulation system.
ASTM C1136 — Flexible, Low Permeance Vapor Retarders for Thermal Insulation, the standard our ASJ and FSK facings are specified against.
ASTM C518 / ASTM C177 — thermal conductivity test methods (heat flow meter / guarded hot plate).
EN 13162 — factory made mineral wool (MW) products for buildings
EN 14303 for building equipment and industrial installations.
GB/T 13350-2017 — the Chinese national product standard for glass wool insulation.
Your project specification. Where your project names a national standard, an EPC specification or a utility standard, we manufacture to that document and issue matching test reports.
Why Buyers Choose Us for Glass Wool Insulation
Our glass wool insulation is made in our own plant and sold by our own export team. That single fact is the reason most of our buyers stay with us: the density, thickness and facing you approve at sample stage are produced on our own line, by people we employ, and shipped by the same company that gave you the quotation. There is no third party between your specification and the product that arrives at your port.
Our Own Production Line, Not a Trading Desk
We run our own glass wool line — melting, fibre drawing, binder application, curing, cutting, facing and packing under one roof — so the parameters that decide your insulation performance are under our direct control rather than negotiated with someone else's factory. Density is set at forming, thickness at the saw, and binder content — the variable that decides both water repellency and the continuous working temperature ceiling — follows our own formulation.
Sea Freight Engineered Around a Bulky Cargo
Glass wool is a high-volume, low-weight product, so your freight is decided by cubic metres rather than tonnes. We compress-pack board and blanket to your cargo plan, nest pipe sections to reduce void space, and quote the actual shipped volume instead of a nominal packing-list figure. On a 40HQ of glass wool board, the difference between a well-compressed load and a loosely packed one is a real amount of freight money. On mixed orders we load glass wool board, pipe sections and blanket in one container, because all three come off our own lines.
Application Support Before You Order
Because we make the material, we can tell you what will actually work instead of what is easiest to sell. We will say when a chilled-water line needs an ASJ vapour-retarder facing rather than plain foil, what installed thickness to specify on a compressible blanket, and which density is genuinely worth paying for in your acoustic application. Send us the operating temperature, the pipe or duct size and the target R-value, and we will return a density and thickness recommendation that we are prepared to stand behind in the quotation.
Our own line, measured data, and a container loaded to your cargo plan — that is what choosing us means on a glass wool order.
FAQ
Q: What makes glass wool roof sandwich panels energy efficient?
A: Glass wool traps air inside its fibers. This slows down heat movement. Your building stays warmer in winter and cooler in summer. You use less energy for heating and cooling. This helps you save money and protect the environment.
Q: Are glass wool roof sandwich panels safe from fire?
A: Yes, you get strong fire safety. Glass wool does not burn. The steel sheets on the outside also resist fire. These panels help slow down flames and give you more time to leave the building safely.
Q: Can you use glass wool roof sandwich panels for walls?
A: You can use these panels for both roofs and walls. They work well in factories, warehouses, schools, and offices. You get good insulation, fire safety, and sound control for many types of buildings.
Q: How do you keep the panels working well over time?
A: Always check the seals during and after installation. Good seals keep water out and protect the insulation. Clean the panels if you see dirt or debris. Regular checks help your panels last longer.
Q: Are glass wool roof sandwich panels heavy?
A: No, these panels are lightweight. You can lift and move them easily. This makes installation faster and safer. You need fewer workers, and you finish your project sooner.
We're well-known as one of the leading glass wool insulation manufacturers and suppliers in China, featured by quality products and good price. Please rest assured to buy high-grade glass wool insulation for sale here from our factory.
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