Why is it in News?

Celebrated by the ISRO, February 21 marks the 50th anniversary of India’s first solid rocket propellant.

About Mrinal:

  • It was named after a famous Classical Dancer Mrinalini Sarabhai, wife of Dr. Vikram Sarabhai.
  • It was the first totally indigenous composite propellant manufactured using locally available raw materials.
  • On Feb 21, 1969, this propellant was used to fly Rohini series RH-75 sounding rocket, which was designated Dynamic Test Vehicle (DTV), from Thumba.
  • At present, India is one of the pioneers in field of Solid Rocket Propellants, but the kick start was provided by Mrinal Solid Rocket Propellant.

Raw Materials used in Mrinal:

  • Polyester resin
  • Ammonium Perchlorate
  • Aluminium Powder along with Nitro-glycerine

What are Composite Materials?

  • A composite material is a material made from two or more constituent materials with significantly different physical or chemical properties that, when combined, produce a material with characteristics different from the individual components.
  • The individual components remain separate and distinct within the finished structure, differentiating composites from mixtures and solid solutions
  • Composite materials are light in weight and possess better structural and thermal properties, making them suitable materials to realize structural and ablative products for launch vehicle applications.