Purity is the primary price driver. High-purity grades (98%+) are extremely expensive and reserved for applications where every defect could disrupt electronic pathways.

The market is dominated by large-scale producers that have moved past lab-scale synthesis: A History of Carbon Nanotubes - AZoNano

The "why" of your purchase depends on which structural story fits your application:

The "story" for buying carbon nanotubes (CNTs) has shifted from a lab-bound curiosity to a multi-billion dollar industrial market. Whether you are a researcher or an industrial engineer, the narrative for a purchase involves balancing high-performance specs against the specific scale of your project. 1. Identify Your Nanotube Profile