NBK Contaminant-Free Screws

In sensitive sectors such as semiconductor manufacturing, medical devices, food machinery, or cleanroom environments, the presence of particles, oil residues, or contaminants in fasteners can cause serious failures: from contamination of the final product to production interruptions, reduced performance, or safety issues.

To prevent these risks, NBK offers a specialised cleanroom washing and packing service that guarantees contaminant-free fasteners suitable for critical applications.

Cleanroom Washing

Cleaning is carried out in a controlled environment with ISO Class 7 cleanliness level (equivalent to Class 10000). The quantity of airborne particles and microorganisms is monitored.

Two cleaning methods are offered:

• Ultrasonic (USC): ideal for corrosion-resistant materials, such as stainless steel.

• Isopropyl alcohol (IPA): recommended for materials prone to oxidation, such as steel.

Cleanroom Packing

Once cleaned, the parts are packed inside a room with ISO Class 4 cleanliness level (Class 10), ensuring final handling is contamination-free.

Measured Results

• Particles: ultrasonic cleaning reduces particles ≥0.3 μm from 210 million (untreated) to 220,000.

• Residual oil: 0.3 mg/ft² after ultrasonic cleaning versus 1.5 mg/ft² with IPA.

These data were obtained from tests with SUS303 stainless steel fasteners. Results may vary depending on the size or shape of the part.

Need more information?

If you want more details about this service or about NBK special fasteners, contact our team. We will help you find the right solution for your technical and industry-specific needs.