Mortar & Pestle, Clear Glass

Quick Answer: A glass mortar and pestle is a bowl and grinding rod made of clear glass, used to grind, mix and triturate small quantities of solids and to blend powders with liquids. Its non-porous surface does not absorb or stain, which suits coloured substances, oily materials and potent pharmaceutical powders.

Where Glass Beats Porcelain, and Where It Does Not

Laboratories and pharmacies keep mortars in more than one material because each has a job. Porcelain and agate are hard and have a rougher working surface, which makes them better for reducing hard crystals to a fine powder. Glass is smoother and non-porous, so it grinds less aggressively, but it holds nothing back: dyes, oily substances and strongly coloured drugs rinse out completely, and nothing carries over from one preparation to the next.

That is why a glass mortar is the usual choice in pharmaceutics practicals for mixing liquids with powders, preparing small quantities of solutions and suspensions, and triturating potent drugs, where a trace left in a porous surface would matter. The clear glass also lets the operator see from the side whether a powder is evenly dispersed. It is standard pharmacy lab equipment in compounding practicals as well as a general chemistry tool.

Bowl size and whether the working surfaces are polished or roughened are not stated in the listing. Glass should not be struck or used to crush large lumps; break these first and grind with a circular, pressing motion. For other pharmaceutics practical items, see LabEquip’s pharmacy category.

Applications

• Trituration and geometric dilution of potent powders in pharmaceutics practicals
• Preparing small batches of suspensions and solutions from powders
• Grinding dyes and coloured salts such as copper(II) sulfate without staining the mortar
• Mixing small samples for melting point or spot tests where cross-contamination must be avoided

Specifications

Care & Handling

• Grind with steady pressure and a circular motion; never pound, as glass can chip or crack under impact.
• Wash straight after use with warm water and detergent and rinse with distilled water; the non-porous surface should come clean without scrubbing.
• Do not heat the mortar or pour very hot liquids into it, since thick glass cracks under sudden temperature change.
• Keep each pestle with its own mortar, because a matched pair grinds more evenly.

Why Choose LabEquip

Pharmacy colleges and pharmaceutics teaching laboratories are the main buyers of glass mortars, often alongside porcelain sets for coarse grinding. The set is offered in LabEquip’s chemistry lab equipment catalogue; send the sizes and quantities you need through the contact page.

Frequently Asked Questions

When should I use a glass mortar instead of porcelain?

Use glass for mixing liquids and semi-solids, for substances that stain or have strong odours, and for potent drugs, because the non-porous surface does not absorb anything. Use porcelain for grinding hard crystals to a fine powder.

What is trituration?

Trituration is the grinding or rubbing of a substance in a mortar to reduce its particle size or to mix it intimately with another powder or a liquid. In pharmacy it also describes diluting a potent drug evenly with an inert powder.

What is geometric dilution?

It is a mixing method for combining a small amount of drug with a larger amount of diluent. The drug is mixed with an equal amount of diluent, then more diluent equal to the mixture is added, and the step is repeated until all is incorporated evenly.

Can I grind hard crystals in a glass mortar?

Small amounts of soft or medium crystals can be ground, but glass is less efficient than porcelain or agate for hard materials and can be scratched or chipped. Crush large lumps first and use gentle, circular strokes.

How do I clean a glass mortar after coloured substances?

Rinse at once with warm water and detergent, then with distilled water. Because glass does not absorb colour, a thorough rinse normally removes all traces; a little ethanol helps with oily or organic residues.

Can the glass mortar be heated or sterilised?

Avoid heating it on a flame or hot plate, as the thick glass can crack. Where a cleaner surface is needed, wash thoroughly and dry, and check the glass type before any heat treatment.

Last Updated: September 2026