Kontes equipment

About Kontes

Kontes is an American manufacturer of specialty laboratory glassware and plasticware, founded in 1942. The company was started by brothers Jim and William Kontes, who initially produced high-precision specialty glassware from the top floor of the family-owned Royal Candy Shop. The Kontes brand now operates under DWK Life Sciences, with operations based in Vineland, New Jersey, in the United States. Its product range covers laboratory glassware, specialty glassware, chromatography supplies, filtration equipment, centrifuge tubes, volumetric labware, and solid phase extraction equipment. These categories place the brand in the precision-glass segment rather than the general consumables market. On Questpair, 55 Kontes items are listed by 4 verified suppliers and distributors across 3 countries.

Kontes product lines on Questpair

The equipment that carries the Kontes name spans several distinct classes of specialty labware. Chromatography supplies form one group, including columns and related glass components used in separation work. Filtration equipment is a second group, covering the glass apparatus used in filtration and vacuum filtration setups. Volumetric labware makes up a third, where precision of graduation is the defining property and where the brand's founding focus on high-precision glass is most directly expressed. Centrifuge tubes and solid phase extraction equipment round out the range, both of them tied to sample preparation workflows.

Several of these classes do work that sits squarely in molecular biology and the life sciences. Solid phase extraction equipment is used for sample preparation and cleanup ahead of analysis, a step that precedes many protein purification and small-molecule assays. Chromatography glassware supports separation methods that underpin protein purification and the analysis of biological mixtures, and column chromatography glassware for protein purification is a recognised category of its own within that work. Centrifuge tubes serve cell culture and molecular biology protocols where spinning down cells or precipitates is routine, and borosilicate centrifuge tubes for molecular biology are a standard consumable in genomics and proteomics laboratories. Filtration glassware is also used for microbiology, where vacuum filtration of liquids through membranes is a core technique, and vacuum filtration apparatus for microbiology describes the setup those labs reach for.

Across these groups, the catalogue mixes single consumable items with larger assembled setups, among the listings that specify a type. A buyer looking for a method-specific piece, a jacketed column or an SPE manifold, will find the relevance of such an item sits in its compatibility with an existing protocol rather than in the brand alone.

What is listed on Questpair?

The Kontes listings on Questpair reflect the resale market for this specialty glass. 69 percent of the listings are used. Used items are priced below new, which is the one difference a buyer can rely on when weighing the two; where warranty matters, it is arranged in consultation for the specific listing. Prices range from EUR 3 to EUR 4.771, with an average of EUR 181, a spread that reflects the gap between single glass consumables and complete setups.

Where a need falls outside the listings themselves, Questpair covers a few specifics. Replacement parts for an item can be sourced via Questpair. Manuals and documentation can be requested by contacting Questpair, where specialists respond within one hour. For condition and calibration questions on volumetric or centrifuge glass, the individual listing is the place to confirm the detail before purchase.

Questpair review of Kontes

Our take based on listings data and supplier feedback

Kontes occupies a specific niche in the laboratory supply market. Where many glassware makers compete on broad consumable catalogues, Kontes built its business from 1942 onward on precision specialty glass, and that heritage is still visible in the type of stock that reaches a resale marketplace. The three benefits above, catalogue depth, a used-and-new mix, and a wide price spread, each reflect how this brand behaves in a secondary market rather than how it markets itself.

On catalogue depth, the Questpair listings are not limited to simple beakers and flasks. Volumetric labware, chromatography columns, filtration components, and solid phase extraction pieces all appear, which matches the primary categories Kontes is known for. For a buyer running a separation or sample-preparation workflow, this matters because the glass in those methods is often method-specific: a jacketed column or an SPE manifold is not interchangeable with generic labware. Finding these items secondhand means a lab can replace a cracked or missing component without committing to a full new-equipment order. The breadth of types in the catalogue, among the listings that specify one, suggests the brand's specialty focus carries through to what gets resold.

The condition mix is the second point worth weighing. 69 percent of the listings are used. For glassware, used condition behaves differently than it does for electronics or instruments: borosilicate glass does not degrade with age in the way a motor or a sensor does, and a volumetric item that has been inspected for chips and verified for calibration can serve as reliably as a new one. Used Kontes items are listed at lower prices than new, and for discontinued patterns that DWK Life Sciences no longer produces, the used market may be the only route to a direct replacement. A buyer should still check each listing for condition notes, since calibration-critical volumetric glass warrants attention, but the age of the glass itself is rarely the deciding factor.

The price spread is the third consideration and the widest in practical terms. Prices range from EUR 3 to EUR 4.771. That range tells you the catalogue holds both single low-cost consumables and substantial assembled setups. The average sits at EUR 181, which places most activity well below the upper figure and indicates that the bulk of listings are individual glass items rather than large systems. A lab shopping for a specific replacement part can expect to find it toward the lower and middle of that band, while a group assembling a complete chromatography or filtration station would look toward the higher figures.

Across these three, the pattern is consistent: Kontes on a resale marketplace is a source for precision specialty glass, much of it used, at prices that track the item type rather than the brand premium. Where a listing's suitability depends on condition or calibration, the individual listing is the place to confirm it, and warranty on any specific item is arranged in consultation for that listing.

**Specialty glassware depth**

Kontes built its reputation on high-precision laboratory glassware rather than general labware, and the Questpair catalogue reflects that focus with volumetric labware, chromatography columns, and solid phase extraction components listed alongside standard glass items.

**Mix of used and new stock**

Of the listings currently on Questpair, 69 percent of the listings are used. Used items are priced below new, which lets a lab source discontinued or legacy Kontes glass that is no longer produced under the DWK line.

**Wide price spread across item types**

Prices range from EUR 3 to EUR 4.771, covering single consumable glassware at the low end and complete chromatography or filtration setups at the high end.