Application: Can be mixed with n-pentane to make EPS and it also can be mixed with cyclopentane as a foaming agent for rigid urethane foam. Quality Standard: C4, %≤1.5 Isopentane, %≥98 n-Pentane, %≤1.5 C6, %≤0.1 Sulfur, (ppm) ≤2 Appearance, Colorless and transparent liquid Package: Steel drum 125KG, ISO tank