Some Important Properties

            Some important properties

**Find structure and appearance:

The surface structure of a fiber is most important in that it control the behavior of the fiber in the yarn and fabric.

Rough surface of fiber enable individual fibers to grip one another when twisted together as a yarn. But it collects dust from the atmosphere. E.G.: Cotton, wool. The smooth surface of fiber affects the lustrous appearance of the fabric. It may not cling to dust as easily as rough surface. E.G.: Nylon, silk.

**Strength:

Strength of any material is determined by breaking strength, which expressed as force per unit cross sectional area with this term, we may describe the ability of a bundle of fiber or a yarn, to resist breakage under tension. It case of single fiber, strength, is described as tenacity.

**Elongation:

When a fiber is subjected to a force .It will stretch to a certain degree. The stretching is described as elongation or extension. It can be measured either as elongation under certain load or as the elongation reached under the fiber breaks. It is exposed in percentage.

**Elasticity:

The behavior of a fiber is expressed by elastic recovery. When a fiber is stretched by a force. It will elongate and after releasing the force. It will return to its original length or to an elongated from. This is expressed in percentage. The elastic recovery of a fiber depends on what load is applied and how man times it is held in the stretched position.

**Moisture relation:

All fiber absorbs moisture when it contact with the atmosphere. The weight of moisture present in a textile material is expressed as a percentage of its oven dry weight.

 **Thermal:

The behavior of fibers or heating has real importance particularly within the range of temperature used practical use. Fabrics should with stand the temperature used in processing drying , ironing  without under deterioration.

**Chemical:

processing of fibers, yarns and fabric often involve the use of chemicals in great variety. Bleaching agent ,detergents, alkalis, acids, dyeing assistants and other chemicals are used in preparing the finished textile. The fiber itself must be able to withstand those substance without suffering harmful effect.