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实验室玻璃器皿
GLA · Laboratory Consumables · 6 models
By Lab Manufacturers China Technical TeamLast reviewed Standards: ISO 3585 (borosilicate glass 3.3), ISO 1042 (one-mark volumetric flasks), ISO 385 (burettes)
Laboratory glassware is borosilicate glass equipment for measuring, mixing, heating and storing liquids. Volumetric items are calibrated to defined tolerances, and general items balance chemical inertness with heat and thermal shock resistance and defined tolerances.
6 models of Glassware
The 6 models below are current configurations; specifications are confirmed on quotation.
A 级容量瓶
A Class A volumetric flask holds a single calibrated volume with a tight tolerance for standards and dilutions. Its long neck and single mark allow precise adjustment to the line, with a certificate for traceability.
A 级容量移液管
A Class A volumetric pipette delivers a single calibrated volume with a tight tolerance. It is used for accurate transfer of standards, reagents and samples in volumetric analysis with a specified drainage time.
刻度量筒
A graduated measuring cylinder gives approximate volume readings across a range with a stable, narrow base. It is used for routine measuring where a single calibrated volume is not required, with a stable base for routine use.
硼硅烧杯
A borosilicate beaker is a wide-mouth cylindrical vessel with a spout for mixing, heating and general handling of liquids. Its graduations are approximate, so it is not used for accurate volume measurement.
锥形瓶
An Erlenmeyer flask is a conical flask with a flat base and narrow neck that mixes without spilling. It is used for titration, culture and heating with reduced splash risk, for titration, culture and heating.
带磨口塞试剂瓶
A reagent bottle with a ground stopper stores solutions and reagents with an inert, sealing closure. It is used for bench storage of solvents, standards and prepared reagents with a ground stopper or PTFE-lined cap.
| Model | Class | Material | Volume range | Tolerance | Calibration temperature |
|---|---|---|---|---|---|
| Class A Volumetric FlaskGLA-0001 | Class A | Borosilicate 3.3 | 5–2000 mL | ± 0.02 to ± 0.5 mL | 20 °C |
| Class A Volumetric PipetteGLA-0002 | Class A | Borosilicate 3.3 | 0.5–100 mL | ± 0.01 to ± 0.05 mL | 20 °C |
| Graduated Measuring CylinderGLA-0003 | Class A or B | Borosilicate 3.3 | — | Per ISO 4788 | — |
| Borosilicate BeakerGLA-0004 | — | Borosilicate 3.3 | — | — | — |
| Erlenmeyer FlaskGLA-0005 | — | Borosilicate 3.3 | — | — | — |
| Reagent Bottle with Ground StopperGLA-0006 | — | Borosilicate or soda-lime glass | — | — | — |
Indicative values for this product class. Final specifications are confirmed on the quotation and in the calibration documents supplied with the instrument.
Laboratory glassware works because borosilicate 3.3 is chemically inert, transparent and resistant to heat and thermal shock. Its low coefficient of expansion, about 3.3 × 10⁻⁶ per kelvin, means it tolerates rapid temperature change without cracking, and it resists attack by most acids, solvents and reagents, so it does not contaminate samples or react with them. Volumetric glassware carries a calibration mark and is made to defined tolerances: Class A flasks and pipettes hold or deliver a stated volume at 20 °C within a tight limit, while Class B allows a wider tolerance for less critical work. Graduations on cylinders and beakers are approximate. Ground joints and stoppers seal by friction, and standard tapers allow interchange. Because glass is brittle, care is needed with impact and with hydrofluoric acid and hot alkalis, which attack it.
Choose the item by function and accuracy. Use Class A volumetric flasks and pipettes where the volume must be accurate, for standards, dilutions and titrations, and Class B or graduated items for approximate work. Select the material for the chemistry: borosilicate 3.3 for general laboratory use, and avoid glass for hydrofluoric acid, hot concentrated alkali and some fluoride-containing reagents, where plastic is safer. Match capacity and neck size to the application, and use narrow-neck flasks for mixing and wide-neck for solids. Check that graduations are legible and durable when buying, and confirm the calibration certificate for volumetric items. Consider whether low-extractable or amber glass is needed for light-sensitive or trace work, and plan cleaning and drying that will not damage the marks.
Glassware are specified in standard and reagent preparation, titration and volumetric analysis, sample mixing and heating, reagent storage, solution dilution and general laboratory work.
Work with Glassware is commonly governed by ISO 3585 (borosilicate glass 3.3), ISO 1042 (one-mark volumetric flasks), ISO 385 (burettes), ISO 4788 (graduated measuring cylinders), ASTM E438 (glass composition) and USP <660> (glass containers). Instrument certifications such as CE marking are confirmed per configuration and never assumed.
Clean glassware thoroughly, using a detergent suited to the residue and rinsing with reagent water, since residual detergent or acid affects results. Avoid abrasives and strong alkalis that etch glass and remove graduation marks, and never use hydrofluoric acid in glass. Dry volumetric glassware by air or with solvent rather than heat, because heating changes the calibrated volume. Handle ground joints carefully, store stoppers loosely or with a spacer and avoid seizing by keeping joints clean. Check for chips, cracks and star cracks before use, since damaged glassware can fail under vacuum or heat. Keep the calibration certificate and recheck or replace volumetric items that are damaged or of unknown history.
Class A volumetric glassware is calibrated to tighter tolerances and is used for standards, dilutions and titrations. Class B allows a wider tolerance and suits less critical work where absolute accuracy is not required.
It is chemically inert, transparent and resistant to heat and thermal shock, with a low expansion coefficient, so it can be heated, cooled and cleaned repeatedly without cracking or contaminating samples.
No. Hydrofluoric acid attacks glass, so it must be handled in polypropylene, PTFE or other resistant plastic. Hot concentrated alkali also attacks glass and should be avoided.
By air or with a solvent rinse rather than heat, because oven drying can change the calibrated volume and mark. Store it clean and dry, and recalibrate or replace items of unknown history.
