Dear Dr. Mohini Rajput,

carbon fiber wrap has high heat resistance, which makes it categorized as non-explosive fibers. Carbon fiber mechanical properties such as the lightness and high resistance of these fibers have resulted in widespread use of them in the composite industry and seismic retrofitting of structures. One of the most important advantages of carbon fiber and carbon wrap, along with their light weight, is the high tensile strength of these fibers.

Carbon fiber is one of the mostly used fibers in the retrofitting and composite industry. This fiber has the most tensile strength among other type of fibers (glass and kevlar fibers). The linear thermal expansion coefficient of carbon fiber is very low at high and low temperatures, which causes the dimensional stability of the carbon wrap at different temperatures. Among the various advantages of carbon fiber (and subsequently carbon wrap), the most prominent are tensile strength and light weight (carbon is about one third of the weight of steel and 5 to 10 times that of its resistance). In addition, carbon fibers have good resistance to fatigue. The durability and long life against chemicals and impermeability against x-rays is one of the most prominent properties of carbon fiber. Also, carbon wrap has excellent electrical conductivity, and the texture and fabricability of fabrics, the fabrication of lightweight composite and solid CFRP, and its heat resistance, distinguishes it from other engineering materials. Carbon fiber is an element of density 2,27 g / cm3 and has different crystalline forms. The carbon wrap formed from carbon fiber is far thinner than human hair in a diameter between 6 and 10 micrometers. The high price of carbon fiber is due to its high long life and providing high resistance to structural members over time, cost-efficient and economical aspects.

Carbon wrap (carbon fabric) and fibers are offered in different tensile strengths and modulus of elasticity with in unidirectional and bidirectional fabrics by Afzir Company according to the needs of different industries in the zone. The carbon wraps (carbon fabrics or cloth) are offered in a wide range of fiber types from 3K to 50KK, with different weights and widths.

Carbon fiber is usually classified based on the number of its filaments, tensile strength, elastic modulus, and the final temperature of the heat treatment in its manufacturing.

Based on the number of filaments, the carbon wraps are classified into small or lightweight tow with less than 24,000 filaments, and large or heavy tow with more than 24,000 filaments.

Carbon wraps are classified according to the mechanical properties of their fibers in very high modulus of elasticity carbon wrap (greater than 540 GPa), high modulus of elsticity (350-450 GPa) and moderate modulus of elasticity (250-350 GPa) carbon wraps. And also, high strength high modulus of elasticity (over 540 GPa) carbon wrap and high strength low modulus (tensile strength greater than 3000 MPa and modulus less than 2000 GPa) carbon wrap and cabob fiber wrap with very high tensile strength (more than 5000 MPa).

Also carbon wraps are classified based on the matrix type to carbon wrap based on acrylic fiber (polyacrylonitrile), carbon wrap based on industrial bitumen, carbon fiber wrap on the meso phase bitumen, isotropic bitumen fiber, carbon fiber based on Rayon Viscose Fiber ( Artificial silk) and carbon wrap are based on the gas phase. In total, carbon wraps can be divided into two categories: synthetic carbon fabric and bituminous carbon fiber wraps. Synthetic carbon wraps are based on synthetic fibers, known as polyacrylonitrile (PAN), are very resistant (more than 3700 MPa) and subsequently but the price of this type of CFRP is expensive. Bituminous carbon wrap, which is obtained from coal distillation, is cheaper than PAN, but less resistance and modulus of elasticity.

Finally, carbon fibers are classified into MH fibers (heat treatment temperatures above 2000 degrees Celsius), SH fibers (about 1500 degrees) and TH (low temperature to less than 1000 degrees with low strength), based on the final temperature of the heat treatment.

For more details, please see at the source, a very interesting web-site by AFZIR - Advanced Solutions - Strengtheining Compaany at: https://afzir.com/en/carbon-fiber/

Best regards, Pierluigi Traverso.

Strength to weight ratio and stiffness to weight ratio

Carbon fibers or carbon fibres are fibers about 5–10 micrometres in diameter

high stiffness, high tensile strength, low weight, high chemical resistance, high temperature tolerance and low thermal expansion

https://www.sciencedirect.com/science/article/pii/B9780081012727000213

Carbon fibers or carbon fibres are fibers about 5–10 micrometres in diameter

high stiffness, high tensile strength, low weight, high chemical resistance, high temperature tolerance and low thermal expansion

https://www.sciencedirect.com/science/article/pii/B9780081012727000213