N-SEAL? acid soluble lost circulation material is specially formulated extrusion spun mineral fiber. Due to its solubility in weak acids; N-SEAL lost circulation material is easily removed from production zones. Applications/Functions: N-SEAL material can be used as an additive for loss of circulation in concentrations of up to 70 lb/100 gallons (86 kg/m3). Advantages: NSF/ANSI Standard 60 certified; Acid soluble; Easily-wetted; Inorganic and non-fermenting.