A good rule of thumb is: 1  for difficult separations (Î´CV â¤ 1) use up to 100 g (~200 mL) of silica gel per gram of compound to be purified (1% load) 2  for normal separations (1 â¤ Î´CV â¤ 5) use from 20 to 90 g (~40-180 mL) of silica gel per gram of compound to be purified (2-9% load)
Typical costs: 1  According to the Academy of Managed Care Pharmacy , insulin pumps cost between $4,500 and $6,500 for individuals without insurance. The price varies depending upon the features, brand and size of the pump. 2  Some insurance plans will cover the cost of the pump.
American Standard air conditioners range in price from about $1500 to $2500 and up, not including installation costs which typically add an additional $500 to $1000.he price of the AC depends on the model, the size and output, the efficiency (SEER) rating, and where you live, among other things. The brand offers comfort and energy efficient air conditioners that can last even on humid and hot days.