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Borosilicate glassware from Duran and Pyrex, including beakers, Erlenmeyer and volumetric flasks (Class A), measuring cylinders, round-bottom flasks and laboratory bottles. We supply universities, schools and labs across Thailand — quotations are free and typically answered within one business day.
Buyer guide
Most glassware disputes start with a line that only says "beaker 500 mL". State the glass, the accuracy class for anything that measures a volume, and the thread or ground joint that has to fit what the lab already owns. Duran, Pyrex, Vitlab, LGS and Kartell can then be compared like for like.
See the checklist and buying questions5 products
Buyer guide
01
Borosilicate 3.3 (ISO 3585) is the default for heated and chemical work: low thermal expansion, so it takes the oven, the autoclave and a hot plate without cracking, and it resists acids and most solvents. Soda-lime glass costs less and is fine for storage and single use, not for heating. Strong alkalis and hydrofluoric acid attack every glass; those jobs go in PP, PTFE or PFA.
02
Anything that measures a volume carries a tolerance class. Class A (ISO 1042 flasks, ISO 4788 cylinders, ISO 648 pipettes) is the tighter tolerance and the one accredited and GMP laboratories specify; class B allows roughly twice the error and fits general preparation. Ask whether a batch certificate or an individual certificate is required, because that decides the item, not just the paperwork.
03
Bottles are sold by thread: GL 45 is the laboratory standard, GL 32 and GL 25 the narrow necks. Flasks and adapters are sold by ground joint: NS 14/23, 24/29 and 29/32 must match the glassware they connect to. Beakers come low form and tall form; cylinders come with a hexagonal or a round base. Name the standard, not "like the old one".
04
Borosilicate 3.3 glassware is routinely autoclaved at 121 °C and dried at 200 °C and above with the cap off. The cap and pouring ring set the real limit: polypropylene caps to about 140 °C, PBT to 180 °C, PFA higher. Vacuum work needs thick-walled filtering flasks and desiccators, never a standard bottle.
05
Class A ware should carry a batch number and, where the method demands it, a certificate for that batch or item. Laboratories accredited to ISO/IEC 17025 usually record the lot on receipt; say so in the request so the supplier ships certified lots rather than open stock.
Both are volumetric tolerance classes defined in the ISO standard for each item type. Class A is the tighter tolerance; a 100 mL class A volumetric flask is allowed roughly half the error of a class B one. Class A is what accredited, pharmaceutical and food-testing laboratories specify for standards and dilutions; class B is enough for general preparation. Class A ware normally carries a batch number and can be supplied with a certificate.
Yes. Borosilicate 3.3 is made for it: 121 °C autoclave cycles and drying-oven temperatures of 200 °C and above are routine for the glass itself. The limit is the closure. Loosen or remove screw caps before autoclaving so pressure can equalise, and check the cap material, because polypropylene caps are rated to about 140 °C and PFA higher.
Both laboratory lines are borosilicate 3.3 to ISO 3585, so for chemical and thermal resistance they are interchangeable in most methods. The differences sit in the range, the closures, the markings and the certificates each maker offers for a given item. When a method or a validation names a brand, keep it; otherwise specify the standard and let the quotation compare equivalents.
Look for the class marking on the item, an "A" printed with the standard such as "ISO 1042 A", the stated tolerance as a ± value at 20 °C, and a batch number. Class B ware is marked "B" or carries no class. A certificate refers to that batch or serial number; a certificate without a matching number on the glass proves nothing.
GL is the ISO thread designation for glass bottles and the number is the outer thread diameter in millimetres, so GL 45 caps, pouring rings and adapters fit any GL 45 bottle regardless of maker. GL 32 and GL 25 are the narrow-neck sizes. Buying by thread size is what keeps caps and dispensers interchangeable across brands.
Glass properties and tolerance classes follow the published standards and the manufacturers' technical pages. The limits of a quoted item are checked on its own data sheet.
Tolerances, temperature limits and certificate options depend on the exact item and maker. Do not read a class or a limit from the category name; confirm it on the data sheet of the quoted item.
