Overview

This technical note explains why MICROSOLV’s Controlled‑Flow and Zero‑Flow CE capillaries are offered exclusively in 1‑meter lengths. These capillaries use an internal bonded or coated layer that enables controlled‑flow performance, but applying that coating uniformly inside extremely narrow capillaries—typically 50 µm or 75 µm ID—poses significant manufacturing challenges. Extending the coated length beyond 1 meter reduces reliability and coating consistency.

As a result, the 1‑meter format ensures product quality, reproducibility, and stable performance in CE applications.

Controlled and Zero‑Flow CE Capillaries Only Available in 1‑Meter Length

Controlled‑Flow and Zero‑Flow CE capillaries with bonded or coated internal surfaces are available only in 1‑meter lengths.

The reason for this limitation is the difficulty of pushing the internal bonding reagent through very small‑diameter tubing—typically 50 µm or 75 µm ID—while achieving a consistent and properly formed coating. Over distances longer than 1 meter, maintaining coating uniformity becomes unreliable, which can affect performance and quality.

Providing these capillaries in a 1‑meter format ensures consistent flow characteristics, stable internal coating, and dependable CE results.

Click HERE for ordering information for Controlled‑Flow and Zero EOF Capillaries.