Please click here for important information regarding the choice between naturally occurring Clear Fused Quartz (CFQ) and synthetic Suprasil® quartz based on the requirements of your EPR experiments.

Want the easiest way to take your samples to liquid nitrogen temperatures?
Dewar Flasks provide you with a convenient alternative to VT systems for studies at -195°C. Wilmad manufactures flasks for almost all common cavity resonators including those requiring reservoirs "off-set" from the center axis. Use these for cavities with iris controls near the Dewar Flask reservoir. Select either Clear Fused Quartz (CFQ) or Suprasil "cold-fingers." All Dewar Flasks are silvered about the reservoir. Each Dewar Flask is shipped with protective nylon meshing.


Small 50mL Dewar Flasks
When you have plenty of sample signal and experiments take only 15-25 minutes, these small Dewar Flasks are ideal. They can handle up to 4mm OD sample tubes or solid samples mounted onto the end of 4mm OD quartz rods. WG-819s are for resonators requiring reservoirs 'off-set' from the center axis.

Product Number	Finger Material	Dim A (mm)	Dim B (mm)	Dim C (mm)	Dim D (mm)	Dim E (mm)	Used for:	Price
WG-816-Q	Suprasil	4.9 min.	11.4 max.	22	86	162	Micro-Now, Radio-Pan, Varian	$431.98 (W)
WG-816-B-Q	Suprasil	5.4	10.5	22	86	162	Bruker,. JEOL	$460.62 (W)
WG-819-Q	Suprasil	4.9 min.	11.4 max.	22	105	178	Micro-Now, Radio-Pan, Varian	$450.68 (W)
WG-819-B-Q	Suprasil	5.4	10.5	22	105	178	Bruker,. JEOL	$469.73 (W)

Larger 150mL version found here:
150ml version
You'll find these sample tubes perfect for use with these Dewar Flasks.
Wilmad's EPR Sample Tubes

Technical Tip:
Keeping Dewar Flask reservoirs and "cold-fingers" clean will extend the hold time by reducing the rate of nitrogen boil.

Remember!
Wilmad uses "-Q" to designate versions using Suprasil in the critical portions of the cell. All other cells are prepared from Clear Fused Quartz (CFQ).