10k 12kg/m3 100mm thickness centrifugal glass wool

glass wool 7

What’s fiberglass wool ?

Fibreglass, also spelled Fiberglass, also called Glass Fibre, fibrous form of glass that is used principally as insulation and as a reinforcing agent in plastics.

Glass fibres were little more than a novelty until the 1930s, when their thermal and electrical insulating properties were appreciated and methods for producing continuous glass filaments were developed. Modern manufacture begins with liquid glass obtained directly from a glass-melting furnace or from the remelting of preformed glass marbles. For producing continuous fiber, the liquid is fed into a bushing, a receptacle that is pierced with hundreds of fine nozzles through which the liquid issues in fine streams. The solidifying streams are gathered into a single strand, which is wound onto a spool. Strands can be twisted or plied into yarns, woven into fabrics, or chopped into short pieces and then bonded into mats. Discontinuous fibres are most often made in a rotary process, in which fine streams of glass are flung outward through holes in a spinning dish and are then broken and blown downward by a blast of air or steam. The fibres collect on a moving conveyor and are formed into wools, mats, or boards.

Fibreglass wool, an excellent sound and thermal insulator, is commonly used in buildings, appliances, and plumbing. Glass filaments and yarns add strength and electrical resistivity to molded plastic products, such as pleasure boat hulls, automobile body parts, and housings for a variety of electronic consumer products. Glass fabrics are used as electrical insulators and as reinforcing belts in automobile tires.

Principles of function

Gases possess bad thermal conduction properties compared to liquids and solids, and thus makes a good insulation material if they can be trapped. In order to further augment the effectiveness of a gas (such as air) it may be disrupted into small cells which cannot effectively transfer heat by natural convection . Convection involves a larger bulk flow of gas driven by buoyancy and temperature differences, and it does not work well in small cells where there is little density difference to drive it.

In order to accomplish formation of small gas cells in man-made thermal insulation, glass and polymer materials can be used to trap air in a foam-like structure. The same principle used in glass wool is used in other man-made insulators such as rock wool , styrofoam ,wetsuit neoprene foam fabrics, and fabrics such as Gore-Tex  and polar fleece. The air-trapping property is also the insulation principle used in nature in down feather and insulating hair such as natural wool .

General description

Wool plugs are often used in GC inlet liners to improve sample vaporization, and/or to keep non-volatile material from entering the column. They can also be used in packed GC columns, solvent desorption tubes, thermal desorption tubes, and purge traps to retain adsorbent beds.

Glass wool is made up of short glass fibres and is non-flammable in nature. It is widely considered as a thermal insulation material in ships, automobiles, air conditioning ducts and water supply pipes. Furthermore, it is also used as noise absorbing material in concert halls, studios and movie theatres. Above all that it is non carcinogenic to humans.

Manufacturing process

Natural sand and recycled glass are mixed and heated to 1,450 °C, to produce glass. The fiberglass is usually produced by a method similar to making cotton candy, by forcing it through a fine mesh by centripetal force, cooling on contact with the air. Cohesion and mechanical strength are obtained by the presence of a binder that “cements” the fibers together. A drop of bonder is placed at each fiber intersection. The fiber mat is then heated to around 200 °C to polymerize the resin and is calendered to give it strength and stability. Finally, the wool mat is cut and packed in rolls or panels, palletized, and stored for use.

Health problems

Fiberglass will irritate the eyes, skin, and the respiratory system. Potential symptoms include irritation of eyes, skin, nose, and throat, dyspnea (breathing difficulty), sore throat, hoarseness and cough. Scientific evidence demonstrates that fiberglass is safe to manufacture, install and use when recommended work practices are followed to reduce temporary mechanical irritation. Unfortunately these work practices are not always followed, and fiberglass is often left exposed in basements that later become occupied. Fiberglass insulation should never be left exposed in an occupied area, according to the American Lung Association.

In the US, the National Toxicology Program (“NTP”), in June 2011, removed from its Report on Carcinogens all biosoluble glass wool used in home and building insulation and for non-insulation products. Similarly, California’s Office of Environmental Health Hazard Assessment (“OEHHA”), in November 2011, published a modification to its Proposition 65 listing to include only “Glass wool fibers (inhalable and biopersistent).” The U.S. NTP and California’s OEHHA action means that a cancer warning label for biosoluble fiber glass home and building insulation is no longer required under Federal or California law. All fiberglass wools commonly used for thermal and acoustical insulation were reclassified by the International Agency for Research on Cancer (“IARC”) in October 2001 as Not Classifiable as to carcinogenicity to humans (Group 3).

Fiberglass itself is resistant to mold. If mold is found in or on fiberglass it is more likely that the binder is the source of the mold, since binders are often organic and more hygroscopic than the glass wool. In tests, glass wool was found to be highly resistant to the growth of mold. Only exceptional circumstances resulted in mold growth: very high relative humidity, 96% and above, or saturated glass wool, although saturated wool glass will only have moderate growth.

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