Question

that which cannot be rectified or made good

Answer 1

That which cannot be rectified or made good are the substance that are irreparable. there can be various reasons behind this situation such as loss, damage or harm.  so these are the irreparable materials. 

Answer 2

Explanation:

Irreparable: (of an injury or loss) impossible to rectify or repair. Irrevocable: not able to be changed, reversed, or recovered; final. Irreconcilable: (of ideas or statements) so different from each other that they cannot be made compatible. Irreplaceable: impossible to replace if lost or damaged.