Isopentane, 99%, CAS No. 78-78-4

200L galvanized steel drum containing 99% Isopentane with GHS flammable hazard label, CAS 78-78-4, and UN 1265 markings on a neutral gray background.
Stainless steel ISO tank container mounted on a road truck chassis, carrying Isopentane 99% with UN 1265 flammable liquid hazmat placard visible in an industrial chemical facility.
Isopentane, 99% in ISO Tank,extra pure, 14.7 MT per tank
Industrial facility with large Cyclopentane storage tanks labeled V-701, V-702, and V-703, belonging to Junyuan Petroleum Group. Each tank features a blue identification band and access ladders. A red horizontal pressure vessel with piping and valves is visible in the foreground, indicating safety or fire suppression infrastructure. The setting is overcast, with a concrete base and organized layout.

Isopentane, 99%, CAS No. 78-78-4

Isopentane, 99% purity (CAS No. 78-78-4), for polyethylene catalyst carrier and polymerization-grade applications. Available in 200L steel drums or ISO tanks.

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Description

Isopentane 99% (CAS No. 78-78-4) is a high-purity grade for applications where trace impurities matter. Specifically, it works as an induced condensing agent (ICA) and catalyst carrier in polyethylene (PE) gas-phase and liquid-phase polymerization processes.

Unlike foam-blowing applications, polymerization processes are highly sensitive to polar impurities such as trace water, oxygen, and unsaturated compounds. Even a few ppm of contamination can deactivate Ziegler-Natta or metallocene catalyst systems, so this grade meets tighter tolerances than the standard 95% commercial grade. However, for general foam-blowing use, our Isopentane 95% is usually the more cost-effective choice.

Isopentane 99%: Technical Specifications

Property Specification Test Result (Typical)
Isopentane Content ≥99% 99.78%
Molecular Formula C5H12 —
CAS Number 78-78-4 —
n-Pentane Content ≤0.3% 0.20%
Hexane and Heavier ≤0.5% Not detected
Butane and Lighter ≤0.5% 0.0010%
Benzene ≤10 ppm Not detected
Total Olefins ≤20 mg/kg 4 mg/kg
Sulfur Content ≤1 ppm 0.21 ppm
Bromine Index ≤10 mgBr/100g 0.69 mgBr/100g
Water Content ≤20 ppm 8 ppm
Density (20°C) 0.61-0.65 0.618
Appearance Clear, colorless Conforms

Applications for Isopentane 99%

Because polyethylene polymerization reactors are sensitive to trace-level contamination, this grade functions reliably as an induced condensing agent in condensing-mode operation, helping remove reaction heat while maintaining stable thermodynamic equilibrium in the reactor. As a result, resin properties such as melt flow index and density stay consistent between batches. What’s more, this grade is not intended for general foam-blowing use, where the 95% grade offers better cost efficiency.

Packaging Options

Packaging Capacity
Steel Drums 200L (130KG net weight)
ISO Tank 14.7MT / 25CBM or 15.5MT / 26CBM

Overall, Isopentane 99% offers the consistency needed for polymer-grade applications. For additional physical property data, see our PubChem reference entry.

For the latest test results, please refer to our
Isopentane Certificate of Analysis (COA)
for the sample collected on 11 November 2026.
All values reported in ppm in this COA are expressed on a weight basis (ppm wt).
Results apply to the sample tested.

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