1. Q: Can I get a sample for the Phosphoric acid?
A: NO, it' s dangerous liquid, can not deliver by courier.
2. Q: What is the Shelf Life of the product?
A: 2 years
3. Q: Will they frozen in winter?
A: 85% could be frozen in low temperature, but 75% will never frozen.
4. Q: Are there tech grade?
There is only food grade, and food grade can also use as tech grade. China government rise high export tax for tech grade