GATE (TF) Textile 2012 Question Paper Solution | GATE/2012/TF/03

Polypropylene fiber is a synthetic fiber that is derived from the thermoplastic polymer polypropylene. It is a versatile material that is commonly used in a variety of applications, including textiles, packaging, and industrial products.
Polypropylene fiber has a number of desirable properties, including:
Lightweight: Polypropylene fiber is very lightweight, which makes it ideal for use in products that require a high strength-to-weight ratio.
High Strength: Polypropylene fiber is very strong and durable, which makes it suitable for use in applications that require high tensile strength.
Chemical Resistance: Polypropylene fiber is resistant to many chemicals, including acids and bases, which makes it ideal for use in industrial applications.
Water Resistance: Polypropylene fiber is hydrophobic, meaning it repels water, which makes it suitable for use in outdoor applications.
Thermal Stability: Polypropylene fiber has a high melting point and is resistant to heat, which makes it suitable for use in high-temperature applications.
Polypropylene fiber is used in a wide range of applications, including in the production of carpets, upholstery, and geotextiles, as well as in the manufacturing of packaging materials, ropes, and industrial products. It is a popular choice for these applications due to its desirable properties and affordability.

Many synthetic fibers, such as polyester and nylon, are denser than water and will sink in water. However, some natural fibers, such as cotton and wool, are less dense than water and can float. The buoyancy of a fiber depends on its density, which is determined by its composition and structure.

The density of polypropylene fibre is very less i.e. 0.92 gm/cm2 than nylon,polyester and acrylic so that polypropylene fibre will float on water.