Features Specifications:Sell L-Threonine feed grade  Product Name: L-Threonine feed grade  Items Specification Appearance  Light brown or Nearly white crystallize C4H9NO3 Content (Dry basis) ≥98.5% Specific rotation []20D -26.0°~ -29.0° Loss on drying  ≤1.0% Cineration  ≤0.3% Ammonium(NH4+) salt ≤0.04% Heavy Metals(Pb) ≤20mg/kg Arsenic  ≤2mg/kg