why low melting point decreases the quality of product

Low melting point of a product indicates that it will melt or soften at a relatively low temperature. This may result in the product being deformed or damaged when exposed to high temperatures during use. This could also result in the product melting during transportation or storage, causing it to lose its shape and form. Hence, low melting points are generally undesirable as they decrease the overall quality and value of the product.