When your application demands precision and accuracy for dependable and repeatable results, turn to DWK Life Sciences — your partner on every lab journey. Our extensive portfolio of volumetric glassware includes the world’s most trusted brand names including, DURAN®, KIMBLE®, and KIMAX®. Designed, manufactured, and calibrated to deliver consistent accuracy, every piece meets or exceeds the most stringent ASTM and ISO regulatory requirements and our Class A, ASTM, and ISO glassware features thetightest tolerances available on the market.

Serialized and certified versions feature-complete traceability through a unique serial number printed on an accompanying certificate. And you can be confident that all calibrated glassware meets NIST certified standards.

Dependable Precision Grounded in Real-World Requirements

Wherever precise volumes are critical — for quality control and validation labs, chromatography applications, or research labs — DWK Life Sciences brings our dedication and precision manufacturing volumetric flasks that deliver accuracy plus added traceability. Over 150 varieties of KIMBLE® KIMAX® volumetric flasks are available — each with the integrity you’ve come to trust.

Our volumetric flasks are calibrated “To Contain” (TC) and include additional optimized features to support your specific applications and workflow needs including heavy-duty wide-mouth, standard forms, super duty, special purpose designs, and accessories. We’ve listened to the needs of users performing large batches of dilutions and custom designed our thick-walled, wide-mouth variations to offer superior strength, durability, and safety. The result? The wider mouth improves pipette access and speeds your work especially for serial dilutions. Large volume numbering allows for easy and quick identification when selecting your volumetric glassware. Another innovation in response to customer feedback.

For improved laboratory glassware management or project-based work, we offer the flexibility of Colorware. Choose from pink, red, blue, green, and yellow. All volumetric flasks are available with several stopper options, including glass penny head, polyethylene, color-coded PTFE, snap and screw cap offerings. For light-sensitive analytes, we recommend RAY-SORB® to protect samples that offer less than 1% light transmission below 400 nm and approximately 5% from 400-600 nm. Consider us your ally, helping to protect your precious samples and stay safe with KimCote® plastic coating technology to contain liquids and glassware fragments in case of accidental breakage.

When paired with volumetric flasks, DWK Life Sciences volumetric pipettes deliver the
precision and traceability are necessary for lab work with serial dilutions, standards, buffers, analytes or modifiers — ideal for chromatography instrumentation, regulated methods, and analytical instrumentation. Designed for tight tolerances, these volumetric pipettes are manufactured according to both ASTM specifications E543, and E969, are NIST traceable and will provide years of reliable, accurate service. We’re confident that these pipettes will provide dependable dilutions and testing of critical fluids — whether volatile organic solvents, biologicals, petroleum, or dairy products. Our ingenious pipette design innovations include critically shaped bulb surfaces and internal tip uniformity, blow-out features, and graduations that consistently allow incremental dispensing.

KIMBLE® KIMAX® volumetric pipettes are offered in four levels:

  • Class A, TC serialized and certified (37006-series with Certificates of Calibration included and individually serialized numbers on the pipettes, matching the number printed on the certificate.)
  • Class A, TD/TC (37003-series)
  • Class A, TD (37002-series)
  • Class B, TD (37001-series)

Recognizing your need for verifiable precision, Certificates of Accuracy are included with 37001, 37002, and 37003-series and match the printed batch numbers on the pipettes. Superior graduation and markings improve vision and confidence in the meniscus, while color-band coding aids in visual confirmation of proper volumetric pipette and/or defense against cross-contamination.

KIMBLE® KIMAX® graduated cylinders and DURAN® measuring cylinders are available in over 125 configurations from Class A serialized and certified to educational grade. Design innovations include easy-to-read and accurate graduation intervals and the ability to accommodate years of lab use. Choose from a range of features such as various types of bumpers, bases, amber versions, safety-coated, and heavy-duty or super-heavy duty offerings.

Our years of experience reveal several ideal applications, including soil testing, petroleum testing, conical pharmaceutical graduates, educational grade, and general mixing and measuring lab use. Of course, all of our graduated cylinders are manufactured from 33 expansion, low-extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements to provide the purity, durability, and performance you require.

Options may include:

  • Class A serialized and certified
  • Class B
  • Batch certified
  • Educational grade
  • Single metric scale
  • Double scale
  • Reverse graduations
  • Ungraduated
  • SAFE-GARD® bumper
  • Pour spout
  • KimCote® safety coating
  • Low-form versions
  • Starter pack
  • Volumes from 2 to 2000 mL

If your lab work calls for diluting solutions and mixing several components in a given quantity ratio, we recommend DURAN® mixing cylinders, available in two different accuracy classes – Class A with main ring points graduation and Class B with line graduation. For additional differentiation and flexibility, we offer mixing cylinders with accuracy Class A blue graduation and the Class B mixing cylinders with white graduation. Volume content tolerances for measuring and mixing cylinders conform to DIN and ISO accuracy limits so that the desired concentration can be precisely set. Class A batch certificates document the mean value obtained from measuring the batch in question, the standard deviation, and the day of issue. The batch certificates can also be retrieved online for your convenience. The batch number consists of four digits. The first two numbers specify the production year, and the following two numbers specify the batch, e.g.: 18.01.

At DWK Life Sciences we know that dependably accurate burets are a lab requirement whether you’re employing them in chemistry, academia, industrial and applied sciences labs, or in-field testing applications. All of our burets are manufactured from high-purity borosilicate 33 expansion glass with easy-to-read graduation marks — etched or ceramic — and many feature funnels fill styles to aid in the fluid introduction. Volume content tolerances and material types conform to the standards you rely on such as USP, ASTM, DIN, and ISO. Over twenty design types, including educational grade and other specialized burets, meet broad application and budget needs. Spurred by our customer partnerships, it’s no accident that our broad offerings and innovative designs — attached reservoir bottles, pellet-type with Schelbach stripe, micro-Burets, and automatic burets — lead the market. Class A serialized and certified versions meet the highest precision measurement needs and regulatory requirements. Have lower precision needs? We recommend Class B in those cases or for general purpose titrations. Additionally, amberized RAYSORB® surface treatment is the standard offering for light-sensitive analytes.

The original DURAN® burets are made of highly chemical resistant borosilicate glass 3.3 expansion glass. Precise scaling makes these burets particularly suitable for titrimetric applications. Volumes can be trusted to be at scale since the adhesion of liquid to glass was taken into account during calibration. The tolerances for the volume corresponds to the error limits of ISO and DIN. DURAN® burets are available with glass or PTFE keys. PTFE keys do not have to be greased, which simplifies and streamlines work in the laboratory.

This versatile line of tilting dispensers is precision manufactured with fixed volumes ranging from 5 mL up to 100 mL. Dispensing heads feature precision-ground glass joints in either 24/40 or 29/42 versions for the quick and secure flask connections we’ve heard customers ask for. These unique dispensers improve workflow efficiency with flask volumes from 250 mL to 2000 mL. All glass components, including tilting dispenser replacement parts, are manufactured from 33 expansion, low-extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.

Frequently Asked Questions

We’ve listened to customers and designed our pipettes with a colored ring marking at its upper end to make selection quick and easy. This color-coding is carried out according to DIN 12621.

All of our pipettes are used for precise volume measurement and are similar in shape to tubes. The difference between graduated pipettes and bulb pipettes lies in the shape and type of graduation. With bulb pipettes, only the total volume can be read off (there is no partial graduation). Graduated pipettes, however, are characterized by partial scaling, where partial volumes can be measured in addition to the total volume.

According to DIN, EN, and ISO, volumetric instruments are divided into two accuracy classes with a fixed error limit.

Here’s a quick guideline: Accuracy Class A always designates the highest accuracy with the
lowest error limit. For accuracy Class B, the double error limits of A/AS generally apply. For volumetric instruments of Class AS, calibrated to "EX", the suffix S indicates rapid execution. This accuracy variant is used for pipettes and Burets.

We’re happy to offer guidance here as cleaning and care are critical. Volumetricinstruments should be cleaned immediately after use either manually in an immersion bath or mechanically in a laboratory dishwasher. Make sure that the cleaning temperature is low, the residence time is short, and the alkalinity of the cleaning medium is also low. Volumetric instruments can then be dried (at max. 250°C) and autoclaved, disinfected, or sterilized.

The use of abrasive cleaning methods is not recommended at any time as this can damage the surface. Cleaning in an ultrasonic bath is possible, however, contact with the sound membranes should be avoided.

Dispensers are piston lifting attachments that can be used to measure defined quantities of liquid easily, quickly, and precisely, for example, from a laboratory bottle. When our dispensers are screwed onto laboratory bottles, the previously set quantity of liquid is sucked into the cylinder by an upward movement of the piston — accurate every time. The subsequent downward movement ejects the quantity of liquid via a cannula. With this principle, there is no need to adjust the meniscus.

For all Class A and AS volumetric instruments there is a retrace code which can be used to
easily download a batch certificate on our website.

No specific certificates are issued for Class B volumetric instruments.