Asbestos yarn

Asbestos yarn

Round cross-section asbestos refractory yarn is woven or spun by several strands of long asbestos fibers; And is widely used for sealing in thermal installations and heat transfer systems.

In general, refractory yarns, also known by other names such as refractory rope or refractory packing, are popular refractory products in the industry. The first unique feature of these refractory products is their high resistance to heat and desirable physical properties. In addition, the high strength of refractory yarn fibers makes them resistant to stretching, wear and tear. The dielectric properties and resistance of refractory yarn against chemicals and pressure on parts, with the reduction and almost elimination of friction, are among the reasons for the widespread popularity of this member of the refractory family and its application in various fields of industry. Another advantage of using fireproof yarn is that it prevents cooling water from entering the parts. As you know, parts become hot over time due to constant friction. If water used to cool parts leaks into them, irreparable damage to industrial equipment may occur.

Among the applications of refractory yarn, we can use thermal insulation, insulation in metal casting, production of industrial washers, flanges, refractory and packing clothes, insulation of stove doors, fireplaces, various types of industrial and commercial ovens, as well as sealing of steam furnaces, sealing Noted in the oil and gas industry, and equipment insulation in the transportation industry.

These refractory yarns are produced according to the need and context of use, with a cross-sectional area of ​​a rectangle or circle. While rectangular cross-section yarn is often used for insulation and sealing, round cross-section yarn is often used for sewing refractory fabrics and garments.

On the other hand, there are two ways to produce fireproof yarn. If the consumer's priority is yarn strength, weave the refractory fibers used. But if the flexibility of the yarns is of paramount importance, the refractory fiber spinning method is used.

Sometimes, in order to strengthen the positive properties or reduce the weaknesses of refractory yarns, they are impregnated with oil or a refractory material or metal wires are added to the yarns.

Asbestos yarn can be considered the oldest refractory yarn used among various industries, with the aim of insulating and preventing the spread of fire. This type of refractory yarn is made of long and twisted asbestos fibers with high strength and has a square or circular cross section.

Asbestos or mountain cotton refractory has been the most widely used product for insulation for a hundred years since the late 19th century, with the aim of insulating. The reason for this popularity was the high strength of asbestos fibers, which was obtained from the sword shape and entanglement of its long fibers. A high degree of fiber cohesion will also prevent energy loss. But in the late twentieth century, with increasing evidence of asbestos dust being toxic and many people exposed to dangerous diseases such as asbestosis and lung cancer, the use of asbestos in the production of refractory products was largely limited due to the sensitivity of experts and the international community. Took. Since then, the use of asbestos has only been allowed in places that are not in direct contact with humans and nature; Like motorhomes.

Round asbestos yarn is a very flexible rope that with its high strength, solves the problem of dimensional differences in thermal expansion and provides an effective insulation against gas leakage. This refractory yarn, which largely solves insulation problems, is produced in the form of two products, dusted and dust-free.

As mentioned earlier, asbestos dust is toxic and can cause irreparable damage to human health. For this reason, in some cases, round asbestos yarn is covered with a layer of Teflon so that the dust is contained and the health of people in contact with it is not endangered. For this reason, this type of asbestos yarn is also known as round Teflon yarn. Also, although round asbestos refractory yarn has good strength and mechanical properties, it can still be reinforced with steel or copper wire.

Today, despite severe restrictions on the use of asbestos, round cross-section asbestos refractory yarns are used in a variety of industrial fields, out of reach of man and nature. Because despite the risks mentioned for this product, the strengths of asbestos yarns prevent its complete elimination from the industry. Among the many properties of round asbestos refractory yarn, the following can be mentioned:

The heat resistance of these yarns is between 662 and 1022 degrees Fahrenheit (equivalent to 350 to 550 degrees Celsius) in the dusty type, and 482 to 662 degrees Fahrenheit (equivalent to 250 to 350 degrees Celsius) in the dust-free type (covered with Teflon). ) Has been estimated.
Asbestos yarn with round cross section has good thermal conductivity.
The high strength of the fibers and the desired mechanical properties make these yarns resistant to stretching, abrasion and tearing.
This product has a unique resistance to most acidic and alkaline substances due to its stunning chemical properties.
Existence of many positive properties in asbestos refractory yarn with round cross section has caused it to have several applications in various fields of industry. Of course, it should not be forgotten that these threads are never allowed to be used in public places. Some of the uses of this refractory product are:

Insulation of boilers
Insulation of thermal installations
Thermal insulation of pipelines, especially in cases where there is a risk of damage due to SaiIt exists in very confined spaces and when no additional protective coating is used.
Insulation of equipment against noble gas leaks
Used among refractory bricks
Steel structure of steel mills
Asbestos yarn with round cross section, different diameters between 4 to 16 mm is marketed.