Effect of super lubricating coating

Author：Shenzhen King Square Technology Co., Ltd.
Date：2022-06-09
Reading volume：2,992 Views

The external and internal surfaces of stainless steel sampling needles and intervention probes produced by King Square can be treated with a super-lubricating hydrophilic coating. Cured under ultraviolet (UV) radiation, this coating forms an ultra-uniform, biocompatible polymer network that drastically reduces surface friction and eliminates sample carryover.

Super Lubricating Hydrophilic Coating Needle

Figure 1: King Square Super-Lubricating Coated Sampling Needle Surface

1. Mechanism of Super-Hydrophilic Coating

When exposed to aqueous solutions (blood serum, reagents, physiological saline), the crosslinked polymer chains rapidly bind water molecules via hydrogen bonding, forming a stable, frictionless hydrated boundary layer:

Ultra-Low Dynamic Friction: Friction coefficient in wet environments is reduced by more than 90% compared to bare stainless steel.
Repelling Biological Adhesion: Denatured proteins, fibrinogen, and lipid droplets cannot contact the metal substrate, preventing clot formation and probe fouling.
Extreme Uniformity: UV photo-initiated crosslinking ensures a uniform layer thickness of 2 μm to 8 μm without edge accumulation.

2. Key Performance Indicators

Test Item	Bare SUS316L Needle	King Square Super-Lubricated Needle
Coefficient of Friction (μ)	0.35 – 0.50	< 0.03 (Hydrated State)
Protein Adsorption Rate	Baseline (100%)	< 2.5% (97.5% Reduction)
Reagent Carryover	~10 – 25 ppm	< 0.05 ppm
Biocompatibility	Standard Medical Grade	ISO 10993 Cytotoxicity Class 0
Sterilization Resistance	Autoclave, Gamma, EtO	EtO, Alcohol wash, UV, Gamma (25 kGy)

3. Clinical & Industrial Applications

Widely deployed in automated chemiluminescence immunoassay (CLIA) analyzers, flow cytometry sampling probes, molecular PCR liquid handlers, and vascular intervention micro-catheters.