Able to be worn daily by police, shore patrols, people in life threatening situations (politicians, business leaders, money couriers, civil police force, body guards etc.)</li></ul> About the material <br /><ul><li>Ballistic Fabric using pure Kevlar.</li></ul>Drawbacks:<br /><ul><li>UV degradation
Non-suitability under wet conditions to the vest of wearer
Blended fabric of wool and Kevlar </li></ul>Advantages:<br /><ul><li>Better tear strength even under wet conditions
Better energy absorbing capacity and reduced number of layers of fabric in a vest.
Better breathability and feels good on skin.</li></li></ul><li> Our technology outline<br /><ul><li>Blended Fabric for bullet proof material
Test Protocol & Discussion</li></li></ul><li>Objectives<br /><ul><li>To overcome the shortcomings of the synthetic fiber
To increase the protection efficiency of the fiber against penetrating bullet
To increase the compatibility to the user</li></li></ul><li>Ballistic Fabric<br /><ul><li>Synthetic Polyaramid Fibres
Commercially used synthetic fibres include Kevlar, Ballistic nylon, Twaron, Spectra and Zylon
Having varying degree of protection against projectiles because of low friction and extensibility
penetrating projectiles can displace these yarns laterally and causes their failure </li></li></ul><li>Impact of Bullet on ballistic fabric <br /><ul><li>The synthetic yarns are displaced by the bullet.
Hence, these are not recommended for use under wet conditions
To overcome the drawbacks of pure synthetic fibres -a combination of Kevlar with natural fibre is used.</li></li></ul><li>Kevlar-Natural Fibre Fabric<br /><ul><li>wool is used in addition to but not as a substitute for Kevlar
helps in retaining the energy absorbing properties of the synthetic fibre
overall weight of the vest is reduced</li></li></ul><li>Kevlar-Wool fabric<br /><ul><li>The number of yarns/cm is determine according to the weight of the fabric and is reflected in the values</li></li></ul><li>Results of tear strength tests for pure Kevlar and Kevlar-Wool blend fabrics<br />
Results of tear strength tests for pure Kevlar and Kevlar-Wool blend fabrics- contd.<br /><ul><li>Presence of wool enhances the tear strength.
Wet fabrics are easier to tear than the dry fabric
In both the WARP and WEFT directions, tear strength of wet</li></ul> wool blend fabric is higher than that of the dry Kevlar fabric.<br /><ul><li>To break the yarns in wool-kevlar blend would need more energy- </li></ul> results in higher energy absorption and more effective in stoppingthe projectile.<br />
ballistic tests<br /><ul><li>Sample panels consisting of 18 to 36 layers of either pure Kevlar and/or Kevlar-Wool blend was tested for ballistic properties according to NIJ IIIA standard by minimum of six shots in a set pattern
The layer at which a projectile was stopped, is taken as a measure of Back Face Signature against stop layer
The average Back Face Signature was 44 mm (Critical BFS)</li></li></ul><li>Conclusion<br /><ul><li>Both pure Kevlar and Kevlar blended with wool fabrics is made available for manufacturing vests in India
As two separate fabrics would be supplied, it provides an opportunity for manufacturer to use either Kevlar only or Kevlar-wool blend only or a combination of the two
Given that weight plays a significant role, it is suggested that a combination of the two fabrics be used
For example, 15 layers of Kevlar and about 14 layers of Kevlar-wool with a layer size of 0.6 m2 would weigh about 4344 g.</li></li></ul><li> Why NSTC <br /><ul><li>Technological development of Ballistic fabrics