1. Price
Spandex 70D is expensive, and the price of 40D spandex has risen from 39,000 yuan per ton to 68,500 yuan per ton; The price of 70D spandex rose from 38,000 yuan per ton to 66,500 yuan per ton.
2. Titer
70D, 9000 meters weighs 70 grams; 40D, 9000 meters weighs 40 grams, the total number of roots in 40D is less than that of 70D, and the single root titer is also smaller.