Laboratory racks: how can tubes, vials and microplates be organised and stabilised?

An everyday essential, the rack keeps tubes, microtubes, cryovials, Petri dishes, flasks and stoppers safe. It holds vessels upright, frees up bench space and streamlines pipetting, incubation and transport workflows. From microbiology to chemistry, racks organise your series, cut labelling errors and improve bench ergonomics. Depending on use, they come in PP or autoclavable polycarbonate, in stainless steel for incubation, or as polymer blocks for flasks. Alphanumeric indexing, colour-coding and stackable versions boost traceability and productivity.

What are the different types of laboratory racks?

From the multi-tube rack to the flask stand, each rack serves a specific task at the bench. Racks come in PP and polycarbonate (versatile, often autoclavable), in 304/316 stainless steel (robust, incubator-friendly) or as dense polymer blocks to stabilise round-bottom flasks. Alphanumeric indexing, colour coding and stackable formats accelerate sample identification and reading across series.

• Multi-tube rack: modular wells, some float for use in a water bath. Ideal for serial pipetting and safe transport.
• Petri dish rack: wire baskets/shelves in stainless steel for 90–100 mm plates; storage, drying and transfer into an incubator.
• Stopper rack: perforated racks to sort, count and dry stoppers/caps during wash or sterilisation cycles.
• Cryotube rack: 1.2–2 mL indexed wells for cryotubes; freezer-compatible and bench-top use on ice.
• Microtube rack: 0.2/0.5/1.5/2.0 mL; inclined planes for precise pipetting; optional dust-cover lids or cooling blocks.
• Tube rack: for 10 to 30 mm (e.g., 12–16 mm, Falcon 15/50 mL), fixed or stackable, numbered for traceability.
• Flask stand: blocks with hemispherical recesses, multi-diameter, for set-up, filling and drying flasks.

Selection criteria: diameter and number of wells, compatibility with sterilisation and working temperatures, chemical resistance, ergonomics (grip, angle), stability (non-slip feet), and traceability needs.

Type	Principle	Applications
Multi-tube rack	Modular wells, coding	Routine, fume hood, water bath
Cryotube	1–2 mL indexed wells	Freezing, biobanking
Flask stand	Hemispherical recesses	Set-up, filling

In which fields are laboratory racks used?

• Life sciences: cell culture, microbiology, PCR and extraction, where stable microtubes and Petri dishes make every step safer.
• Pharmaceutical & biotechnology: release testing, in-process control, compound/sample libraries in cryovials.
• Food & beverage: microbiological analyses, tube series for quality control and batch traceability.
• Environment: water/soil sampling, sorting and incubating series in mobile or fixed laboratories.
• Cosmetics & chemistry: formulation, stability studies, syntheses; flask stands and tube racks for preparations and centrifugation steps.
• Quality control laboratories: organising series, colour coding and indexing to reduce errors and speed up audits.

The different types of laboratory racks available

Frequently asked questions about lab racks

Which material should I choose for a rack?
Stainless steel for high heat and intensive cleaning; PP/PC are autoclavable and versatile; polymer blocks for round-bottom flasks. Choose based on chemical compatibility, sterilisation, rigidity and your working environment.

Can all racks be autoclaved?
Most PP/PC and stainless-steel racks are autoclavable. Check the product datasheet. Do not autoclave foam inserts unless specified; risk of warping if parameters are unsuitable.

Which rack for 1.5 mL and 2.0 mL?
A dedicated microtube rack for 1.5/2.0 mL (often combined with 0.5 mL) with an alphanumeric index. An angled platform aids pipetting; a lid keeps dust out.

Can cryotube racks go in the freezer?
Yes, they’re designed for 1–2 mL cryovials. Favour materials rated for low temperatures and clearly readable markers. For long-term storage, use freezer boxes.

Floating rack: what’s it for?
Floating racks hold tubes in a water bath, preventing burns and dropped tubes. Ideal for enzymatic incubations, digestions or controlled degassing.

How to size a flask stand?
Match the well diameter to the flask volume; check stability and number of positions. A non-slip surface and a one-handed grip make set-up and filling easier.

Good maintenance practice?
Rinse spills promptly; clean with a neutral detergent or alcohol. Avoid incompatible aggressive solvents; inspect for cracks and replace damaged racks.