Selection Guides

Technical notes on specifying laboratory glassware and reagents, from the team that supplies laboratories across Indonesia.

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Choosing the right instrument class, capacity and tolerance for a method.

Erlenmeyer Flask Selection: Neck, Closure and Capacity
Selection Guides · July 15, 2026

Erlenmeyer Flask Selection: Neck, Closure and Capacity

Pick the neck, not the flask. Narrow against wide neck bore at every capacity, screw cap against ground stopper, and how full a conical flask should actually be.
Volumetric vs Graduated Pipettes: Which One Your Method Needs
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Selection Guides · July 1, 2026

Volumetric vs Graduated Pipettes: Which One Your Method Needs

Above 5 ml a graduated pipette is two to three times looser than a one-mark pipette. Full tolerance tables for both GLASSCO ranges, colour band codes, and where glass stops being the right tool.
Measuring Cylinder Class A vs Class B: When the Certificate Matters
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Selection Guides · June 15, 2026

Measuring Cylinder Class A vs Class B: When the Certificate Matters

The nine-capacity tolerance table, why a Class B flask beats a Class A cylinder at every volume, and the cases where the batch certificate actually earns its price.
Burette Class AS vs Class B: What the Tolerance Costs You
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Selection Guides · June 1, 2026

Burette Class AS vs Class B: What the Tolerance Costs You

Class B is exactly twice the Class AS tolerance. Here is what that means as a percentage of your titre, why division is not tolerance, and when Schellbach or PTFE is worth paying for.
Volumetric Flask Class A vs Class B: Which Tolerance Does Your Lab Actually Need?
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Selection Guides · May 15, 2026

Volumetric Flask Class A vs Class B: Which Tolerance Does Your Lab Actually Need?

Class B tolerance is exactly twice Class A. Here is the capacity-by-capacity data, a procurement decision table, and the ISO 4787 method for verifying a flask you already own.
Laboratory Glassware Accuracy Classes: Class A, AS and B Explained
Photo by Tara Winstead on Pexels
Selection Guides · May 1, 2026

Laboratory Glassware Accuracy Classes: Class A, AS and B Explained

Class A, AS and B compared across flasks, burettes, pipettes and cylinders — with the real GLASSCO tolerance figures, and why the same class means five times the error on a cylinder.

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