
NMR & EPR Tubes
The NMR sample tubes supplied by Goss Scientific are manufactured by Wilmad Labglass, the world's largest manufacturer of NMR precision tubes.
Wilmad Labglass
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Wilmad Labglass (SP Scienceware) have over 40 years experience in the manufacture of NMR tubes and other precision glassware and manufacture tubes that perform with the greatest reproducibility and reliability. All tubes are checked individually to meet exacting specifications for camber and concentricity.
Wilmad Labglass are an ISO9001 accredited Company.


Also available:
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EPR / NMR Long Tip Pipettes
Bar Code Tubes
NMR / EPR Reference Tubes
Solid State NMR Accessories
TD NMR and MRI
Transfer Lines / Dewars / Flat Cells etc

Laboratory and Specialised Glassware
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Goss Scientific are distributors for the full range of Wilmad Labglass / SP Scienceware products.
Wilmad manufacture a diverse range of laboratory glassware as well as Precision Engineered Glass, OEM quartz components and ASTM glassware.
Wilmad manufacture using Borosilicate, Corning, Kimble and Schott glass, are experts in glass to metal sealing and working with quartz - natural, synthetic and Heraeus-Amersil.
Please contact us with your requirements for off the shelf or specialised items.
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NMR / EPR Tube Information
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Economy or Precision NMR Tubes
Economy NMR tubes are recommended only for 1D NMR with small organic molecules (mw<1500) at ambient temperature.Class B (economy) tubes have less thermal shock resistance than Class A (precision) tubes and may contain Fe2O3 which may have an impact on shimming quality.For NMR experiments that involve cooling / heating, biological sample, multi-dimensional, multi-nuclei or DNP techniques, please use Precision tubes (Class A).
Quartz EPR Sample Tubes
Product numbers that include "PQ" are Precision Tubes."SQ" are Non- Precision.For EPR experiments that must estimate electron spin density and/or produce highly repeatable signal amplitude between different runs we strongly recommend the Precision EPR Tube.
Suprasil EPR Sample Tubes
Product numbers that include "PQ" are Precision Tubes."SQ" are Non- Precision.For EPR experiments that must estimate electron spin density and/or produce highly repeatable signal amplitude between different runs we strongly recommend the Precision EPR Tube.
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Tube Selection Guide - CFQ or Suprasil
Two types of quartz are used for EPR sample tubes:
1) Clear Fused Quartz (CFQ), a naturally occurring material
2) Suprasil, the trade name of Heraeus-Amersil synthetic quartz
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Unique Properties of Quartz for EPR
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· Quartz is pure silicon dioxide
· Quartz has a high dielectric constant
· Quartz has a low level of paramagnetic impurities
Materials of high dielectric constant alter the microwave field and concentrate the field on the sample. The low level of paramagnetic impurity in quartz prevents interferences with the samples EPR lines.
Over long periods, CFQ irradiated with UV will discolour. Synthetic quartz transmits electromagnetic radiation through the UV spectrum. Synthetic Quartz EPR tubes (Suprasil) should be used when applying ionising radiation to generate radical species and for a sample of very low signal. In most other cases, Clear Fused Quartz will provide the same results as Suprasil.
Due to technological advancements the sensitivity of EPR has increased, the direct result is that certain high Q cavities will pick up the signal from these impurities especially in tubes over 4mm OD.
Clear Fused Quartz (CFQ) is purified from naturally occurring quartz so the existence of certain material radicals from mining is inevitable.
In this instance we recommend switching to Suprasil EPR products which are made of synthetic material and suppress major impurity contents by an average of 2 orders of magnitude.