NorLoc™ Generation II Security Caps

Safeguarding Critical and Precious Samples Against Losses

Advance to the next level of sample security, personal safety, and time savings. Combine Norell NorLoc™ II Security Caps™ with Norell Secure Series™ NMR tubes to experience the ultimate sample containment system.

Standard 5 mm and 3 mm NMR tube cap designs have remained unchanged for decades. Many users can attest to the significant flaws inherent in traditional NMR tube caps, especially when capping numerous sample tubes.

The NorLoc™ II Security Caps™ feature an internal patented design that addresses many flaws in traditional NMR tube caps while introducing substantial improvements not found in other NMR tube caps.

Key Design Features:
The NorLoc™ II Security Cap™ applies more easily and quickly, increasing personal safety and saving valuable time. It incorporates an advanced dual-seal design, providing superior sealing and retention capabilities, especially when combined with Secure Series™ or other Norell NMR tubes featuring the Security Band™ that interlocks with the NorLoc™ II Security Cap™.

This interlocking capability creates superior cap retention, forming a “vaulted seal” that increases barrier performance with any NMR tube. The locking interaction prevents NMR tube and cap separation, safeguarding precious samples during refrigerated storage, temperature cycling, or repeated cap removal and reapplication.

Patented Design Elements:
The patented design includes an expanded entryway or guide section that helps align and position the cap on the NMR tube. Adjacent to this, a constriction forms a tight, effective seal against the tube wall, followed by a second constriction that creates a dual seal. The innermost region expands slightly in diameter, allowing the NMR tube to slip through easily, creating positive indication of proper placement and “lock” for a reliable “vaulted seal.”

The upper straight edge of the patented marking area on Secure Series™ or other Norell NMR tubes provides clear visual indication of the limit for complete closure with the NorLoc II Security Cap™.

Performance Advantages:
When preparing dozens or hundreds of samples, tube capping consumes significant time. Traditional caps must be held at an angle, then stretched and twisted onto the tube—a tedious process that often results in tilted, misshapen caps promoting poor seals and splits. This process creates mechanical stress in glass NMR tubes, frequently leading to breakage, spilled samples, and potential injuries.

With the NorLoc™ II Security Cap™, the NMR tube enters the expanded guide section and becomes self-aligning, allowing the cap to be pushed straight onto the tube. This method leverages the compressive strength of glass while minimizing radial and torsional stresses that cause glass fracture from stretching and twisting traditional caps.

Proper, trouble-free closure is ensured by combining NorLoc™ II Security Caps™ with Secure Series™ or other Norell NMR tubes, creating a “vaulted seal” that resists separation even with challenging solvents such as chloroform-d. This provides precise, uniform cap positioning and seal integrity, safeguarding critical samples against losses from evaporation, contamination, or atmospheric degradation.