Wilmad´s Glass Tubes for NMR, EPR/ESR

Wilmad-LabGlass products are manufactured using state of the art processing and inspection equipment. This allows us to provide items of the highest quality and tolerances in the industry for pharmaceutical research, aerospace systems, analytical measurement equipment, nuclear magnetic (NMR) and electron paramagnetic resonance or electron spin resonance (EPR/ESR) systems plus sophisticated electronic components and subassemblies.

Our product range consists of:

Wilmad-LabGlass is offering best in scientific products and engineered glassware around the world. Wilmad-LabGlass has a combined 60+ years of providing the best, state of the art glass and quartz precision engineered and precision bore products.

Wilmad LabGlass Tubes for NMR and EPR/ESR

  • 3 mm tubes
  • 4 mm tubes
  • 5 mm tubes
  • 6,5 - 7,5 mm tubes
  • 8 mm tubes
  • 10 mm tubes
  • 12 mm tubes
  • 13 mm tubes
  • 16 - 20 mm tubes
  • 22 - 30 mm tubes
  • Bruker 2,5 mm tubes
  • Quartz tubes
  • Tube caps
  • Amberized tubes
  • Constricted tubes
  • Capillary tubes
  • Shigemi NMR tubes
  • Sapphire NMR tubes

Wilmad NMR Tubes

The Wilmad tubes are ideal for high throughput NMR measurements and non-spinning experiments, even at high field strengths, packaged in cartons of 100 tubes without end caps (available separately) for a special net price of 99,40 Euro for 100 Tubes!

Pressure / Vacuum Tubes - Product Group A

Our Pressure / Vacuum tubes are commonly used for catalytic studies, T1 measurements, gas / liquid phase reactions and elevated temperature studies using low boiling point solvents. Designed to be connected to either a 1/8" Stainless Steel vacuum line using SwageLok fittings (see spare parts table) or a rubber vacuum hose using a glass connector (OF-60), the system is rugged and easy to use. The PV-ANV valve is made out of Teflon and all other parts are Pyrex or equivalent glass, assuring you chemical resistivity. Valve is opened simply by turning  counterclockwise. Tubes can be kept under vacuum or pressure for a considerable length of time.

Pressure / Vacuum Tubes

Spare Parts / Adapters - Product Group A

Spare Parts / Adapters

Screw Cap Tubes -Product Group A

The Screw Cap tube is commonly used when you need to add sample or reactant using either syringe or cannula in order to avoid contaminating sample with atmospheric gases. You can also fit a Coaxial Insert (WGS-5BL) into the tube and seal the system air tight for external referencing, external locking, studying intermolecular interactions or determining magnetic susceptibility. Custom sizes are available. Just ask our Customer Service Department. Tube comes with cap and septum. Caps and Septum can be ordered seperately.

Screw Cap Tubes

Screw Cap Accessories - Product Group A

PTFE / Rubber

Laminated discs consisting of a sheath of PTFE bonded chemically to white pharmaceutical rubber. Inert to most solvents and many corrosive materials. Not recommended for multiple punctures.

PTFE / Silicone

Laminated discs consisting of a PTFE sheath bonded chemically to silicone rubber. Inert to most organic solvents and compounds;  however, not recommended for use with strongly corrosive materials. Resealability properties of silicone rubber are excellent.

Low Pressure / Vacuum (LPV) - Product Group A

LPV valve tubes are commonly used for air sensitive samples. T1 measurements, catalytic studies, gaseous samples and when using volatile solvents. The LPV valve can be attached atop any precision WILMAD NMR tube. The following list shows a sampling of our most popular tubes. We can also custom manufacture them for you to a specific size and length.

J. Young Tubes

Omnifit Tubes - Product Group A

Omni-Fit tubes are commonly used for vacuum applications, where sample or reactants are injected into the tube. Tubes must be kept either under vacuum or ambient pressure and are not intendet for higher presssure applications (see J Young tubes). Order OFV (complete valve) and 507-OF-X for complete system set up. Other parts are sold separately.

Omnifit Tubes

Spare Parts / Connectors - Product Group A
Spare Parts / Connectors

PTFE-FEP NMR Tube Liners - Product Group A

PTFE-FEP NMR Tube Liners


For NMR investigations where chemical compounds such as hydrofluoric acid, ammonium bifluoride and concentrated hydroxide solutions are present.

Tube liners are round-bottom and made from Teflon (Polytetra-fluoroethylene/Fluorimated Ethylene Polypropylene copolymer). Thin-wall construction minimizes filling-factor losses. Although the liners are not rigid, they straighten upon insertion into the sample tube. Not recommended for elevated  temperature studies. A PTFE plug is included with each liner.

For 29Si studies, the Teflon Tube Liners can be inserted into an NMR sample tube where the bottom 50 - 60 mm of the sample tube has been removed.

Tip-Off Manifold - Product Group A

Tip-Off Manifold


For preparation of Air-Sensitive NMR sample mixtures. Vacuum transfers, freeze-pump-thaws and sample sealing is easy to complete.

The manifold port can be fused quickly to a vacuum pack. Chemical resistance of the manifold ports is excellent; only Viton, Teflon and Pyrex can contact the sample mixture.

The NMR tube connects to a threaded aluminium bushing which is isolated from the vacuum by a Teflon high vacuum rotary valve with Viton o-rings. A twist of the wrist opens and closes both the rotary valve and port bushing.

Positioning Rods and Vortex Plugs  - Group A

Positioning Rods and Vortex Plugs


You get a choise of plugs for tubes from 5 to 20 mm.

Use positioning rod for plug insertion or removal from NMR tube.

Plug stays in position for use until removed.

NMR Filters and Funnels- Product Group A

NMR Filters and Funnels


Having particulate matter in your sample can lead to poor spectral resolution. Use our special Bulb Filter to remove particles. Featured are two designs, one with luertip for S.S. needle attachment, the other with glass tip. Both fit into all sizes of WILMAD NMR tubes. The Sintered glass tip removes particles larger than 60mm.

NMR Filters and Funnels

Use our Powder Funnel to load reagents into WILMAD NMR tubes.
Tip fits into 5 mm or larger tubes.

Gas-Tight Syringes and Needles - Product Group C

Gas-Tight Syringes and Needles


We selected the PTFE Luer Lock syringes that best meet your NMR sampling needs. We give you a choice of needle types and sizes. Stainless steel for septum punctures;  PTFE needles to get samples into and out of the smallest sample tubes.

Hamilton Syringe features

  • Gas and Liquid Tight
  • Reproducible (volumes to ± 1%)
  • Inert borosilicate glass, PTFE, and Stainless Steel
  • Pressure tight to 200 psi.

You can use these syringes to handle air-sensitive and/or volatile samples with precise control over sample volumes.

Long-Tip NMR Pipettes

Our pipettes allow for easy adding or removing of liquid samples from your NMR tube.

You can chose from two sizes, # 802 designed to reach down into 7 inch tubes, and # 803A designed to reach down into 8 and 9 inch tubes. Replacement bulbs are also available.

See table.

Long-Tip NMR Pipettes

NMR pH-Electrode

NMR pH Electrode for use in 5 mm thin wall tubes up to 8 inch length. Glass probe dimensions are 3 mm OD and 180 mm length.

NMR pH-Electrode



Reference System EVEREF TM
Reference Electrolyte 3 M KCI
Diaphragma Ceramic
pH Range 0 to 14
Temperature Range 0 to 80° C
Resistance at 25° C 500 MOhm
Sodium Error 0,10