What are the key differences between industrial-grade and high-purity ethane in downstream applications?

What are the key differences between industrial-grade and high-purity ethane in downstream applications?
The gap between industrial and high-purity ethane is not just a decimal point—it is a different market. Industrial grade (90%-99%) is a commodity tied to energy and petrochemical economics: steam cracking to ethylene accounts for over 90% of global ethane consumption, with ethylene yields of 65%-80% versus 30%-35% for naphtha cracking, plus roughly 40% lower separation costs and nearly 47% lower CO2 emissions per tonne of ethylene. High-purity grade (99.9%+) shifts into specialty gas territory: as a carbon source for CVD and PECVD thin films, as a calibration standard for gas chromatography, and even as a cryogenic agent for electron microscopy sample vitrification. Electronic grade (99.999%+) further tightens oxygen to below 1 ppm and moisture to below 3 ppm, where any trace impurity can oxidize films or alter deposition stoichiometry, directly impacting chip yields.