Reagent Bottle with Ground Stopper

What is the Reagent Bottle with Ground Stopper?

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.

Overview

The bottle is made from borosilicate 3.3 or, for some solvents, from soda-lime glass, with a narrow or wide mouth, a ground glass stopper or a screw cap with a PTFE-lined liner, and approximate graduations. Capacities range from 25 mL to 10,000 mL. Ground stoppers give a good seal for aqueous and many organic solutions, while screw caps with PTFE liners are preferred for alkaline solutions that can seize a ground joint, and for volatile solvents where a plastic-lined seal is more reliable. Amber glass protects light-sensitive reagents, and some bottles have a pouring ring or a dropping pipette. Labels and closures must resist the contents, and the bottle should not be used for hydrofluoric acid or hot alkali.

How does it work?

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.

What are the key features?

• Borosilicate or soda-lime glass
• Ground stopper or PTFE-lined screw cap
• Capacities 25–10,000 mL
• Approximate graduations
• Amber option for light-sensitive reagents
• Narrow or wide mouth

What are the technical specifications?

A typical reagent bottle with ground stopper configuration offers material of Borosilicate or soda-lime glass, capacity range of 25–10,000 mL, closure of Ground stopper or screw cap, liner of PTFE for screw cap, mouth of Narrow or wide and graduation of Approximate. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Reagent Bottle with Ground Stopper is used in solvent storage, reagent and buffer storage, standard solution storage and bench solution handling. Across the wider Glassware class, laboratories also deploy it for standard and reagent preparation, titration and volumetric analysis and sample mixing and heating.

Which standards and certifications apply?

Relevant standards and methods include 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). Certification candidates for this model are CE and ISO 9001 manufacturing; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

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.

How do I select the right Reagent Bottle with Ground Stopper?

Choose the closure to suit the contents: ground stopper for aqueous and most organic solutions, PTFE-lined screw cap for alkalis and volatile solvents. Confirm capacity and mouth. RFQ: volumes, closure, amber option and content type requirements.

How does it compare with other Glassware variants?

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.