Laboratory Guides & Technical Notes

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

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Practical guidance for laboratory procurement

Written for the people who actually specify and order laboratory glassware: procurement officers, QC analysts and lab managers. Every figure quoted comes from a published standard or from our own catalogue data.

Reagent Storage and Shelf Life in a Tropical Laboratory
Reagents and Chemicals · September 3, 2026

Reagent Storage and Shelf Life in a Tropical Laboratory

A certificate describes the day of release. Segregation by hazard class, humidity in a tropical store room, open-bottle dating, and the quarterly check that catches the rest.
ACS, ISO and Ph. Eur.: What a Reagent Certification Guarantees
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Reagents and Chemicals · September 1, 2026

ACS, ISO and Ph. Eur.: What a Reagent Certification Guarantees

The marks after a grade name say whose published specification the batch also meets. How to read a real label, what a lot-specific certificate of analysis must show, and when the mark is mandatory.
Analytical Reagent Grades: EMSURE, LiChrosolv and What They Guarantee
Reagents and Chemicals · August 17, 2026

Analytical Reagent Grades: EMSURE, LiChrosolv and What They Guarantee

A grade is a specification, not a purity figure. What EMSURE, LiChrosolv, Suprapur, Certipur and Titripur each control, and how to match a grade to a method.
Ground Glass Joint Sizes Explained: What 14/23 and 29/32 Mean
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Glassware and Materials · August 3, 2026

Ground Glass Joint Sizes Explained: What 14/23 and 29/32 Mean

The two numbers are the cone diameter and the ground length in millimetres. Why one flask capacity ships in five different joints, and how to standardise a bench so the glass connects.
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.

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