Q. What temperature do I need to seal an ampule?
A. Our ampules are manufactured from 33 expansion borosilicate glass and require temperatures of 820 degrees C in order to seal them.
Q. Does Wheaton sell a machine to flame-seal ampules?
A. No. However, there are companies that do sell sealing machines. Probably the most popular is called the Ampulmatic manufactured by Bioscience Inc.
Q. Can I store sealed ampules directly in the liquid phase of liquid nitrogen?
A. We do not recommend storage directly in contact with the liquid phase, only the gas phase.
Q. Are the General Purpose glass bottles autoclavable?
A. All the glass bottles are autoclavable. However, only the black phenolic caps with rubber liners are autoclavable.
Q. What is the maximum temperature of the glass?
A. The glass bottle can withstand temperatures up to 500 degrees C.
Q. What is the shelf-life of a glass bottle?
A. Glass containers do not have an expiration date or a limit to their shelf-life.
Q. Is a glass bottle with a poly-vinyl liner chemically compatible with DMSO?
A. No. The glass is OK, but not the liner material. Please check the Chemical Resistance Chart found in the Technical Data section on our web site for more compatibilities.
Q. How much pressure/vacuum can the glass bottles handle?
A. None of the containers we sell are tested for pressure or vacuum.
Q. How can I tell the thread size of my bottle?
A. Please refer to "Determining a Glass Container Thread Finish" found in the Technical Data section of our web site.
Q. What percentage of a molded glass bottle is made from recycled glass?
A. Up to 60% of the batch used to make bottles is recycled glass.
Q. Are the HDPE Leak-Resistant bottles chemically compatible with ethyl alcohol?
A. Yes. Please check the Chemical Resistance Chart found in the Technical Data section on our web site for more compatibilities.
Q. Are the General Purpose plastic bottles autoclavable?
A. Only those bottles manufactured from polypropylene can be autoclaved. Sterilization information can be found in the Technical Data section under Typical Properties of Plastic, on our web site.
Q. Can any of the plastic bottles that Wheaton sells, be centrifuged?
A. None of our plastic bottles have been designed or tested for use with a centrifuge.
Q. How can I tell the thread size of my bottle?
A. Please refer to "Determining a Plastic Container Thread Finish" found in the Technical Data section of our web site.
Q. Do the rubber stoppers that Wheaton sells, contain natural rubber latex?
A. Stoppers made from natural red rubber and stoppers made from chlorobutyl-isoprene blend contain natural rubber latex. All of the other stoppers are latex-free.
Q. What is the maximum dry-heat temperature the stoppers can withstand?
A. Stoppers made from silicone or FKM can withstand dry-heat temperatures up to 200 degrees C. All of the other stoppers can withstand dry-heat temperatures up to 100 degrees C. It should be noted that all of the stoppers can be steam autoclaved at 121 degrees C. The given temperature limits are for dry heat environments.
Q. Which stopper is usually used when packaging contact lenses in serum vials?
A. Our item 224100-178 is made from silicone and was originally referred to as the contact lens stopper.
Q. Is a polypropylene cap with a poly-vinyl liner compatible with DMSO?
A. No. Please check the Chemical Resistance Chart found in the Technical Data section on our web site for more compatibilities.
Q. How can I tell the thread size of my cap?
A. Please refer to "Determining a Cap's Thread Finish" in the Technical Data section on our web site.
Q. Can I convert my 11 mm Hand Crimper so it crimps 20 mm seals?
A. Although it is possible to convert your crimper by replacing the internal crimping jaws and plunger, it is not advisable. Manufacturing uses special fixtures to help assemble the components.
Q. Can I steam autoclave aluminum crimp seals?
A. Yes. The aluminum seals can be steam autoclaved at 121 degrees C at 15 psi for 30 minutes.
Q. Which cap lining material provides the best gas/moisture barrier properties?
A. If compatible with the product, a metal foil liner would provide the best barrier to gas and moisture transmission.
Q. What is the recommended application torque for a 20 mm screw cap?
A. The industry rule-of-thumb for determining application torque in inch-pounds, is to divide the screw thread size in half. For a 20 mm screw cap, the application torque would be 10 in-lbs. The rule-of-thumb should be used for guidance only.
Q. What is the most likely cause of indentations on the sides of a crimped aluminum seal?
A. Usually it is caused by over-tightening. Try adjusting the crimping tool for a looser seal.
Q. My Wheaton Crimpenstein crimping head will not close around 20 mm aluminum seals with the plastic buttons.
A. There is a special crimping head for the aluminum seals with the plastic buttons. Please make certain your crimping head has the jaws with the internal recess for the plastic button that is part of the seal.
Q. How can I determine what size crimper I have if there are no markings on the crimper?
A. The easiest way would be to measure the diameter of the plunger. The plunger is approximately the same diameter as the seal and contacts the top of the aluminum seal during a crimping operation.
Q. Will the Celstir® Spinner Flasks function with other manufacturer's magnetic stirrers?
A. The Celstirs function with major manufacturer's magnetic stirrers.
Q. How can I attach a pipe through the sidearm to add/remove media?
A. Silicone stoppers that fit the Celstirs with 45 mm sidearms are available with 0, 1, 2, and 3 holes (¼" diameter). Also available are open-top caps to secure the stopper to the sidearm.
Q. What bottles do you sell that can be used with the Mini Bottle Bench-Top Roller Culture System?
A. Any of our glass bottles 38 – 60 mm in diameter, can be used with this unit. This includes AC Rounds, Boston Rounds, Straight Sided, Wide-Mouth Packers, and our borosilicate Media Bottles.
Q. What are the part numbers for the replacement drive belts for the 9-Deck Wheaton Modular Roller Apparatus 348968-A?
A. The (2) motor belts are Wheaton item number I052719. The (16) deck belts are Wheaton item number I052734. The (36) stretch belts are Wheaton item I052737.
Q. Which Roller Apparatus will provide a digital readout for the bottle speed?
A. Presently, only our R2P Roller Systems provide a digital display of the bottle speed.
Q. I'd like to use a vial with a 24-400 thread as an evaporator flask on my rotary evaporator. The vapor passage tube has a standard inner joint of 24/40. Do you have any suggestions?
A. Our item 139663 is a standard outer joint with a 24/40 taper on one end and a 20-400 thread on the other end. This would connect to the vapor passage tube. Our item 125499 is a Wheaton Connection with a 20-400 thread on one end and a 24-400 thread on the other end. This would connect to the outer joint and the vial.
Q. What are the inner diameters and lengths of the 3 extractor chambers for the Soxhlet Extraction Apparatus that Wheaton sells?
A. The inside chamber dimensions for item 415000 is 28 mm diameter x 100 mm tall. The inside chamber dimensions for item 415005 is 40 mm diameter x 120 mm tall. The inside chamber dimensions for item 415010 is 49 mm diameter x 170 mm tall.
Q. What type of glass are your chromatography vials made from?
A. Our clear glass vials meet the requirements of ASTM E-438 Type I, Class A borosilicate glass.
Q. What size tubing do I need for the Reagent Sprayers?
A. Any flexible tubing with an ID of 5-6 mm will work with the Reagent Sprayers.
Q. Can I use the Acura® 501 Dispenser to dispense chloroform?
A. Yes. Please check the Chemical Resistance Chart found in the Dispenser section in our catalog for more compatibilities.
Q. Can I fill a tray of vials using the Acura® 520 Dispenser without removing the vials from the rack?
A. It is possible with the optional Extension Tubing (844024). The extension tubing allows filling up to a distance of 600 mm (23.5") from the dispenser.
Q. I disassembled my 20 ml Calibrex® Dispenser for cleaning and now that it is reassembled, it doesn't draw up liquid.
A. The most common reason for this is that the outlet valve (located behind the dispensing nozzle) was reinserted backwards. Try reversing the valve. This should correct things.
Q. Do any of the lyophilization stoppers that Wheaton sells contain natural rubber latex?
A. Only those stoppers made from chlorobutyl-isoprene blend contain natural rubber latex. All of the other lyophilization stoppers are latex-free.
Q. What size vial should I use to lyophilize 5 mL of product?
A. When freezing product in glass, the container should not be filled more than half full. If you want to lyophilize 5 mL of product, you should select a vial that holds at least 10 mL.
Q. Can replacement parts for my Wheaton pipettor be purchased directly from Wheaton?
A. Replacement parts are only sold through our distributors. A listing of our distributors can be found on our web site.
Q. How can I get my pipettor fixed? Does Wheaton repair their pipettors?
A. We have a Repair Service that can repair Socorex brand pipettors. Our Repair Service Group can provide you with information for returning your pipettor. Please contact Repair Service at 800.225.1437.
Q. The tips our lab uses fit loosely on the Acura multi-channel pipettor. Is there a fix to this problem?
A. The pipettor is equipped with a feature called a ”JusTip” for tip ejection. It will be necessary to adjust this for the tips to fit properly. The operating manual will explain how.
Q. I would like to designate some of my pipettors for a particular use in the lab. Do you have any suggestions?
A. We offer colored caps (Smarties) that snap into the plunger button on the top of the pipettor. All the designated pipettors can have the same color Smartie.
Q. I would like to pipette using a glass Pasteur pipette tip. Which Wheaton pipettor can I use?
A. Our 5 ml Acura (W810316) and 5 ml Acura Electro (W870920-A) when used with adapter W820023 will work with glass Pasteur pipette tips. Also, our 2 ml Calibra (851340), which comes supplied with an adapter, can be used with Pasteur pipette tips.
Q. What tubing size and pump settings should I use to get the best accuracy?
A. The best accuracy can be obtained by using the smallest size tubing ID and the slowest pump speed setting. Unfortunately, this selection takes the longest to dispense the requested volume. Each user must decide on the dispense time vs accuracy that best suits their requirements.
Q. Can I dispense methyl alcohol using the supplied silicone tubing?
A. Yes. Please check the Chemical Resistance Chart found in the Technical Data section on our web site for more compatibilities.
Q. What is the easiest way to attach the glass sinkers to the tubing?
A. Dipping the end of the tubing in water should make it easier to attach the glass sinker.
Q. How many pump heads can be attached to the Omnispense Elite Dispenser?
A. One additional pump head can be attached (stackable pump head for 2.3 mm wall tubing - Wheaton item W375022).
Q. Can I use the handset from the Omnispense Plus Dispenser with the Omnispense Elite Dispenser?
A. Yes, but it will not work as it does with the Omnispense Plus. The "Start" key on the handset will be the only working key and it will start and stop the dispense cycle. It will no longer pause a dispense cycle.
Q. How can I obtain the best calibration possible when using the Unispense Pro Dispenser?
A. The manual states "for best results, the pump should run for a minimum of 15 seconds. The longer the run time the more accurate the calibration". This provides the unit with more rotation/ml data to use in its calculations. Also, set the calibration motor speed to what will more closely match the actual dispensing motor speed. The breaking dynamics of the motor is affected by the speed of the motor. This also holds true for the Omnispense Elite Dispenser.
Q. When using the Unispense Pro Dispenser, how can I remove a stored process parameter that is no longer being used from a register so it won't accidentally be used?
A. A stored process parameter can not be erased. However it can be over-written by entering zeros for the functions, which would alert the user the stored process parameter is not usable. This is also true for the Omnispense Elite Dispenser.
Q. What size cables do I need for the Stainless Steel Bomb Sampler?
A. The eye bolt opening is 18.4 mm in diameter and the opening in the plunger rod is 4 mm in diameter.
Q. Can I use the E-Z Sampler with any bottle?
A. The bottle must have a 33-400 or 33-430 GPI thread finish.
Q. Why are some of the glass Coliwasas prescored?
A. In some instances, it may be permissable to snap the sampler in half after use, and leave in the sampling container.
Q. Can I sterilize the staining dishes/jars using an autoclave?
A. No. However, they can be dry heat sterilized (except for units with plastic caps). They must be put into the oven when it is at room-temperature, and they must be allowed to cool in the oven before removal. Staining dishes/jars can be heated to 500 degrees C.
Q. Does Wheaton offer a staining dish made from borosilicate glass?
A. Not at the present time.
Q. What type of stainless steel are the slide racks made from?
A. The slide racks are manufactured from 304 stainless steel.
Q. Can the plastic Cryogenic Vials be stored in the liquid phase of liquid nitrogen?
A. We do not recommend storage directly in contact with the liquid phase, only in the gas phase.
Q. Does Wheaton manufacture custom glass vials? Can I get Wheaton products packaged to meet my specific requirements?
A. Yes to both questions. Wheaton's SciLutions ® customized services offering includes custom containers and custom packaging, bar coding, critical cleaning, surface treatment, and pre-weighed containers. Click here for more information.
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