In solid motors, HTPB and PBAN are two common types of plasticizers. a) True b) False

The given statement is True

Explanation:

Solid motor uses plasticizers out of which Poly Butadiene Acrylic Acid acrylo Nitrile (PBAN) and Hydroxy Terminator Poly Butadiene (HTPB) are the most commonly used. These are used in space shuttles.

PBAN is comparatively stick, thick and it has a stinky smell as compared to HTPB. PBAN can be mixed and cured at high temperastures few days later wheras HTPB can be mixed and cured at room termperatures within a day.

The propellant can be ready to use for flight a day later.