Cryogenic Dewar Flasks

NEW Dewar Dryer Rack

The Dewar Dryer Rack provides a compact, convenient way to organize and reliably dry your 4L LN2 dewars (#81750-4). The ubiquitous 4L dewars are the workhorse dewar for many labs. After use, moisture condenses on the inner surface of the dewar and there has not been a convenient, reliable way to dry them quickly so that the next user can be assured that they are moisture-free and ready to use for their experiments without the risk of water contamination.

The Active Version of the Dewar Dryer Rack (#81750-4-1) automatically starts a drying cycle upon placing a dewar, drying it out completely in 35 minutes. The Passive Version (#81750-4-2) provides a way to organize your 4L dewars after being dried on the Active Dewar Dryer Rack.

To dry a 4L dewar, it is placed upside-down onto the Active Dewar Dryer Rack with the drying tube inserted into the dewar. The dewar is automatically sensed when placed, starting a drying cycle. Ambient air is pulled through a filter, ensuring only clean air is being used, and heated before being blown into the dewar. The system is configured to run for as much time as needed to dry the dewar completely, and a short cooling phase is included at the end to bring the dewar to room temperature. An LED under the rack indicates the stage of the drying cycle and when the drying cycle is complete.

The passive version of the Dewar Dryer Rack then provides a convenient way to organize all of your 4L dewars after being taken off of the active version, freeing the active rack to dry another dewar.

Tipping Stand & Roller Base for Large Cryo Dewars

The Tipping Stand supports the weight of the Dewar while you safely tip the unit. Easily move storage Dewars with sturdy cast aluminum frame. Unit has five wheels with ball-bearing swivel casters. Use with Dewars with 15.4" diameter base.

Roller Bases available for 25L and 35/50L Dewars.

Liquid Withdrawal Device, Dipper & Phase Separator

The Liquid Withdrawal Device (LWD) provides convenient pressure transfers of liquid nitrogen from LD25, LD35 and LD50 Dewars. The device clamps directly to the special neck flange that is found under the plastic trim collar around the neck of these containers. Flow rates up to 8 liters per minutes are possible at operating pressures up to 7.25 psig (0.5 bar/50 kPa). Liquid can be dispensed directly from the LWD via the spout provided, or through a standard cryogenic hose connected to the liquid outlet.

High Capacity Dewar Refrigerator for Cryo Specimen Storage

The High Capacity (HC) Series Dewar Refrigerators are designed for storing large quantities of a variety of materials at or close to liquid nitrogen temperature.

The TW35 model is convenient for storing frozen samples in a cryo-EM lab. TW35 Dewar features a wide 4.7" diameter neck for better visibility and easier access and six 3.7" wide canisters (with a possibility to add a seventh canister for extra storage capacity), all in a relatively compact form. A 10 or 4 liter Dewar Flask (#81750-10, 81750-4) can be used to conveniently maintain the level of liquid nitrogen without disturbing the stored samples. A special Roller Base (#81750-35-1) greatly helps with mobility.

Dry Cryo Shipper

The CX100 Dry Shipper Dewar is the only cryo shipper endorsed by a major cryo-electron microscope manufacturer. The unique adsorbent material inside prevents a liquid spill if the dewar is tipped over, while the storage temperature inside the chamber is maintained at -190°C. The samples are kept inside a standard Worthington dewar canister. An upright shipping case is available for shipping the dewar.

Complies with IATA regulations for open cryogenic receptacles. The lid can be locked; Temperature loggers are available.

Pope Dewars are ideal for temporary storage of liquid nitrogen in laboratory settings. These dewars are the lab standard in glass lined, fully silvered dewars. They are readily available in a variety of standard shapes and numerous sizes. We have cylindrical, narrow-mouth, hemispherical, along with convenient low-form shallow styles. Extended base and handle versions are also available.

Low Form Shallow Open Top Dewars in cylindrical and hemispherical configurations are available in popular sizes to match standard flask sizes. Fully silvered glass dewars are based with tip-offs off center for use with stirrers.

The traditional Lab Grade Dewar line encompasses a full range of sizes of fully silvered, glass double-walled evacuated flasks. The wide mouth cylindrical dewar is available with a choice of either protective mesh or extended aluminum housing and also the popular narrow mouth spherical configuration. Lab grade dewars for benchtop use come with polyethylene lids.

Handled Lab Grade Dewars offer a complete lab grade dewar at an affordable price. The most popular wide mouth cylindrical Dewars are manufactured with a full extended aluminum base, full exposed lip and attached handle to facilitate portability, safety and convenience.

Foam Cryo Dewars

Foam dewars provide a neat and handy alternative to heavier vessels or the commonly utilized styrofoam shipping containers. The special foam material is chemically inert and mechanically durable enough to be exposed directly to liquid nitrogen, without leaking or degrading. Patented design makes the foam vessel easier to handle and safer to use than a traditional low profile glass dewar. Because of its lower thermal mass, a foam vessel will cause less liquid nitrogen boiling when it is filled. The foam surface will also accumulate less frost. As a result, less liquid nitrogen is consumed.

Available as 500ml, 800ml and 1400ml Cryo Cups featuring convenient protruding handle, a Tall (1800ml) vessel, and a Mini (130ml) vessel.

NEW PELCO^® Foam Cryo Pitcher

The PELCO^® Foam Cryo Pitcher provides a convenient liquid nitrogen (LN₂) compatible vessel capable of transferring and pouring LN₂ accurately with minimal waste or spillage. This is particularly useful for LN₂ transfers requiring high precision such as Vitrobot Dewars, Clipping Stations, and small mouthed reservoirs. The easy-grip handle and pour spout makes the foam pitcher easier to handle and safer to use than a traditional low profile glass dewar. The lid is bi-directional, allowing the spout to either be covered or open while in place. The pitcher is available in both 500ml and 1000ml capacity.

The foam is chemically inert and lightweight while being more robust than common polystyrene pitchers. The material is durable and will not develop leaks or degrade over time from repeated LN₂ exposure. Because of its lower thermal mass, the foam pitcher will cause less liquid nitrogen boiling when it is filled and the foam surface will accumulate less frost. As a result, less liquid nitrogen is consumed.

Lab Grade Dewars

• Efficiency assured by rigid bakeout and evacuation control (evacuated to 10^-5 torr or better).
• Evacuation tip completely shielded for increased protection.
• Weighted bases on all models for stability.
• Optional full length metal housing on most models for added protection.
• No pads between walls on cylindrical dewars eliminating this heat transfer potential.
• Supplied polyethylene stopper tops off dewars to minimize evaporation.
• Holding time 2–6 hours depending on volume.

Standard Base

Standard Wide Mouth Cylindrical Dewars
These Dewars exemplify the emphasis placed on both efficiency and safety by Pope Scientific. All Pope Lab Grade Dewars are manufactured of borosilicate glass for liquid nitrogen service. A sturdy mesh cover facilitates a firm grip, provides a cushion against bumping and increases protection. Holding time 2–6 hours depending on volume.

Full Base

Full Length Aluminum Housing Cylindrical Dewars
All Wide Mouth models can be obtained with an exterior metal housing that extends nearly to the top rim of the Dewar (a slight extension of the glass dewar facilitates pouring). This housing adds the safety of metal to the efficiency of glass, particularly important in handling operations. Holding time 2–6 hours depending on volume.

Dewars With Handles

• Aluminum metal housing extends full length of dewar for added protection.
• The dewar lip is extended to facilitate pouring.
• Polyethylene stopper, specially vented, minimizes evaporation.
• Holding time 2–6 hours depending on volume.

These dewars are ideal for temporary storage of liquid gas in laboratory settings. These flasks incorporate the convenience of a coated handle on the most popular wide mouth cylindrical models.

These dewars are priced only slightly higher than the standard models and afford the increased portability, pouring efficiency and added protection. All the features in one complete dewar.