Answer:
They must be affordable, durable, and available.
Explanation:
One is familiar with the fact that the materials would get exposed due to spontaneous uses. Thus, they become vulnerable to tear and wear as the time duration goes by. One of the characteristics, that is, durability makes sure that the substances thrive for various years, and offer great service to the masses. In supplementation to this, the substances should also be cost-effective and easily available.