How to choose rock wool and foam asbestos

Rock wool products is currently the insulation insulation materials widely used in industry. Another kind of insulation material is foam asbestos, also have certain application in building and industrial insulation, but two of them have some differences in the use of performance, to remind users pay attention to selection.
China’s production of foam asbestos product performance can be divided into three types, namely the ordinary foam asbestos, ordinary elastic foam asbestos and elastic waterproof foam asbestos (modified foam). Ordinary foam poor water resistance, water becomes muddy or bean dregs like, and fire resistance performance is poor. Combustible or smoke smell, chemical stability is poor. The performance of modified foam was better than ordinary, but the price is more expensive, generally 500 per cubic meter to 700 yuan, or 1000 yuan per cubic metre, good quality wool is higher than domestic prices, such as brand mineral wool prices only 350 ~ 450 yuan per cubic meter.
At present, China’s production of foam asbestos appearance with foreign products have very big difference, the performance is not stable enough. The production of foam asbestos as most in use long fiber asbestos, such as 3R grade Canadian asbestos. China asbestos of long fiber yield less, the production of foam asbestos most use 5 R-rated short cotton, so its products less elastic. Foam asbestos texture is very soft, low resilient rate, large amount of compression. For example, 10 cm thick foam asbestos can be pressed into 2 cm thick, the heat insulation construction, strapping difficulties, outer protective layer, in order to guarantee the insulation thickness, need more support, increase the difficulty of construction and engineering cost. And the rock wool products fiber is long, good elasticity, high strength of the product, generally only consider 10% compression, can easily bind firmly, without increasing support.
From the perspective of foamed asbestos insulation, low operating temperature, can only be used in insulation below 500 degrees Celsius, and rock wool work up to a temperature of 600 degrees Celsius, the more resistant than the foam asbestos.
In addition, considered from the point of view of environmental protection, asbestos is harmful to the human body, asbestos fibre inhalation may cause respiratory diseases and even cancer, currently in Europe are forbidden to use. Although our country is currently no regulations prohibit the use of asbestos, but from the protection of the health of users, suggest to choose non asbestos products. Foam asbestos is a kind of asbestos, the products also have this problem, use should pay attention to health.
Rock wool products is a selection of basalt as main raw materials, by high temperature melting, made of inorganic fiber is composed of a high-speed centrifugal equipment, new type light to join the special binder and dustproof oil and made of insulation material, the rock wool has excellent thermal insulation and sound absorption properties, and chemical stability, corrosion resistance and good incombustibility, so widely used in the construction industry, industry and shipbuilding industry, and heat insulation, sound-absorbing insulation engineering.

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How stone wool is made

The idea of producing stone wool was fostered on Hawaii. After volcanic eruption on the islands the natives found woolen strings of stone lying on the ground. They thought it was hair from their goddess, Madame Pele.

Today we know that stone wool is much more than that. We have discovered the unique qualities of the material that makes it perfectly suited for a wide range of purposes. That is why the ROCKWOOL Group has spent more than 70 years constantly improving its production process.

In the beginning everything was done manually, from the trusted employee who shoveled the approximately right amounts of raw material into the furnace and to the people wrapping up the final product.

Today highly sophisticated machinery ensures the quick and steady production of a superior stone wool quality at an ever lower cost.

Foam glass or Cellular glass

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Cellular glass is a new inorganic thermal insulating material with a structure of equally closed cells. The composition is glass, added with foaming agent. It’s foamed by high temperature in foaming ove, and then cooled down in cooling oven. It well reserves the chemical stability of inorganic glass. As a result, it has the following features: low density, low thermal conductivity, vapor impermeability, no water absorption, incombustibility, protection from mould and rat eating, high mechanical strength but easy to cut and able to bear all kinds of chemical erosions except the hydrofluoric acid.

Cellular glass, nontoxic in itself, has stable chemical properties and good thermal insulating performance protecting from deteriorating at a wide temperature range from cryogenic temperature to high temperature. At the same time, it can protect from humidity, fire and erosion. It is praised as “permanent thermal insulating material with no need of renewal”, because it is not only safe but also durable in rigor conditions of low and cryogenic temperature, underground, open air, flammability, moisture sensitivity and even chemical erosion. Consequently, it is widely applied in permanent projects as heat and cold insulating material, such as in the industries of petroleum, chemical engineering, architecture, refrigerated warehouse, underground project, shipbuilding, national defense and war industry.
Currently, the product quality from domestic manufacturers is poor, due to the limitations of recycled glass, fabrication processing and equipment, etc. The physical properties, such as thermal conductivity and compressive strength, are obviously lower than imported products.
Characteristics of High Performance Cellular Glass:

1. Applicable for both cryogenic and high temperature.
2. Low thermal conductivity but high compressive strength.
3. No water absorption, no permeability, excellent airtight property.
4. Low thermal expansion coefficient and good dimensional stability.
5. Totally not combustible, fireproof, and corrosion resistant.
6. Nontoxic, harmless, and environmental friendly.
7. Closed cell system with low chloride content
8. Inorganic, no-aging, no-decay.
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Rockwool Pipe

Rock wool pipe is a kind of rock wool thermal insulation material used in pipeline, is a natural basalt as the main raw material, after high temperature melting, made of high speed centrifugal equipment of artificial inorganic fibers, while adding a special binder and dustproof oil, then through high heat curing, made into a variety of specifications, the different requirements of rock wool insulating pipe.Rock wool can also with ceramic fiber cotton insulation composite made from rock wool composite pipe.

Rock wool pipe shell is widely used in petroleum, chemical industry, metallurgy, shipbuilding, textile and so on various industrial boilers and piping heat preservation, also used in the construction industry partition, ceiling and wall insulation and and various types of cold and hot pipes and hidden, exposed pipe insulation.
Electric power, petroleum, chemical industry, light industry, metallurgy and so on heat preservation and heat insulation pipes are suitable for all kinds of pipe heat preservation and heat insulation, especially for small mouth straight pipeline construction is convenient quickly. Water proof rock wool tube has moisture-proof, exhaust temperature, hate water special function, is suitable in the rain, damp environment use, moisture absorption rate below five percent, hate water rate above ninety-eight percent.

 

Introduction – inorganic heat preservation material commonly used thermal insulation materials

Europe and the United States independent housing, common thermal insulation insulation materials, generally speaking, there are:rock wool ,glass wool ,XPS (Extruded Polystyrene), EPS (Expanded Polystyrene) ,PUR (Rigid Polyurethane) etc.

Independent residential heat preservation material, according to the material chemical composition, can be divided into: thermal insulation material of inorganic material and organic material of heat preservation material two kinds big.Inorganic material heat preservation material, meet the fire won’t burn, belong to the flame retardant materials, in the application of independent residential location more extensive.Organic material heat preservation material, is the use of organic chemistry, material processing and become, although, in accordance with the requirements in production and processing, add some of the flame retardants, increases the organic material heat preservation material fireproof performance, to achieve a certain flame retardant grade, but in the application of independent residential location also has certain limitations.
In addition, some of the heat preservation and heat insulation material, but also has certain sound-absorbing sound insulation effect.