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Advance to the next level of sample security, personnel safety and time savings. Combine Norell NorLoc™ caps with Norell NMR tubes and experience the ultimate sample containment system!

The standard NMR tube cap design has existed for decades. Many users can attest to the significant flaws inherent in the traditional NMR tube cap, especially when faced with the chore of capping numerous sample tubes.

The Next Generation of Norell NorLoc™ NMR tube caps features a patented design that not only addresses many of the flaws in the traditional NMR tube cap, but the superior design of the NorLoc™ cap introduces many substantial improvements as well.

The patented NorLoc™ cap can be applied much more easily and quickly, thereby increasing personal safety and saving valuable time. It incorporates an advanced seal design, conferring superior holding and sealing capabilities. The superior retention of the cap to the tube forms a “vaulted seal” that safeguards precious or critical samples, even during refrigerated cold storage and variable temperature cycling and withstands repeated removals and reapplications.†

The patented NorLoc™ design includes an expanded entryway, or guide portion, at the opening of the cap, to help align and start the placement of the cap on the tube. Adjacent to this, a constriction within the cap forms a tight, effective seal against the wall of the NMR tube. Finally, the innermost region expands slightly in diameter, allowing the tube to slip easily through to the end, creating a positive indication of proper placement and “lock”, ensuring a “vaulted seal” every time.

When preparing dozens, or even hundreds, of samples for analysis, tube capping can consume a significant amount of time. The traditional cap must first be held at an angle to the tube mouth to start placement of the cap, and then must be stretched and twisted onto the tube. This becomes a tedious exercise after capping a few dozen tubes, and often results in caps that are tilted and misshapen afterwards, promoting poor seals and split caps. This process also creates significant mechanical stress in the glass NMR tube, and can frequently lead to broken tubes, spilled sample and worse, including cuts and injuries.

With the patented NorLoc™ cap however, the tube easily enters the expanded guide section, and then becomes self-aligning, whereupon the cap can simply be pushed straight onto the tube. This method takes advantage of the compressive strength of glass, while minimizing the common causes of glass fracture from radial and torsional stresses induced in the glass from stretching and twisting traditional caps on the NMR tube at an angle.

Proper closure, with a “vaulted seal”, can be felt as the tube reaches the fully “locked” depth in the cap, ensuring precise, uniform positioning and seal integrity, safeguarding critical and precious samples against losses caused by evaporation, contamination or degradation due to atmospheric exposure.

† Important Notice: When using NorLoc™ caps on samples containing chlorinated solvents such as chloroform or dichloromethane (methylene chloride) and, to a lesser extent, acetone, we highly recommend discarding the caps after a one-time use if an automated system, such as the Bruker SampleJet, transfers the samples by means of the cap only, or if sample introduction and removal from the NMR probe depends solely on the cap. This notice does not apply to samples held and transferred by conventional spinner turbines.

Chloroform, in particular, permeates into the polyethylene material of the NorLoc™ cap, causing expansion and reduced retention of the cap to the NMR tube. In this case, we recommend completing automated analyses as soon as possible, but within 6 hours, before significant permeation and cap loosening can occur.

If the analyses cannot be completed within the above time, please remove the solvent exposed caps and replace with new NorLoc™ caps before processing through automated sample handling systems.
Name / Number Cap Type Cap Colour Size Pack Size Basket
SVCP-NORLOC-3 Closed Port Red 3mm 96
SVOP-NORLOC-3 Open Port White 3mm 96
SVCP-NORLOC-5 Closed Port Red 5mm 96
SVOP-NORLOC-5 Open Port White 5mm 96


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NEW E3 Drying Cabinets Our new Sustainable E3 range of glassware drying cabinets, now distributed by GPE Scientific are unique - first to market, energy efficient, safer and cheaper to run. Working with the University of Cambridge, the E3 is a novel, sustainable solution to glassware drying, In addition they’re much easier to use. The E3 drying cabinets are suitable for general purpose warming applications and drying glassware or instruments. All models in this range are fully insulated for improved efficiency and energy savings. Made from sheet steel finished in an easy to clean powder coated paint, with stainless steel interior. Fitted with adjustable shelf runners, removable chrome-plated wire grid shelves and ventilation outlet. Heated by Incoloy sheathed elements in the base of the unit. All units have toughened glass doors; 100 and 200 litre models have sliding doors and the 425 and 885 litre models have double-glazed hinged doors. The 425 and 885 litre models are fitted with lockable castors. Energy efficient, safe, sustainable. Low Energy and part of our NEW Sustainable Solutions Divsion Timer to automate shut down periods Fully insulated with adjustable vent cover Integral 7 Day time with display  Digital Controller with fixed over-temperature cut-out Adjustable shelf runners with removeable chrome shelves Lockable castors available on the 425 & 885 litre models Easy to clean powder coated body with toughened glass doors Benefits & Cost Savings: Low Energy consumption - >50% lower than traditional cabinets! Low heat output - reducing air conditioning costs Fully insulated - safer for the end user Easy, specific temperature controller  Integral programmable 7 day timer - on/off to reflect your needs Convection or fan - heat up time <1 hour
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