Laboratory cappers/decappers: how can the opening and closing of tubes and vials be automated?

Whether working with screw-cap tubes, crimp vials or collection tubes, capper/decapper systems provide fast, repeatable and safe opening and closing. They protect sample integrity, limit aerosols, reduce musculoskeletal disorders (MSDs) associated with repetitive movements, and improve traceability in batch workflows. Manual, semi-automatic or robot-compatible systems can support SBS 24/48/96 formats and 1D/2D barcode reading options to secure every handling step.

What are the different types of cappers/decappers and how should you choose?

There are three main families. Manual models (11–20 mm crimping/decapping pliers, tools for 15/50 mL screw-cap tubes) are economical and precise for short runs. Motorised semi-automatic versions provide reproducible tightening torque, reduce variability and suit medium throughput. Finally, automatic/robot-compatible systems handle SBS 24/48/96 racks of cryotubes or microtubes, with high speeds, presence sensors and selective recapping by cap colour or format. For crimp vials (HPLC/GC 8–11–20 mm), crimp cappers provide a perfect seal with adjustable force. Key criteria: tube/cap format compatibility (internal/external thread), torque control (presets by cap material), aerosol management, LIMS/1D/2D reader integration, material (stainless steel for frequent cleaning), maintenance and calibration (GLP/GMP). Select a throughput suited to your needs (from tens to several hundred, or even >1,000 tubes/hour) and a footprint compatible with a hood or isolator. Consumables (caps, septa, seals) affect leak-tightness and chemical compatibility. A quick comparison table can help guide selection:

Type	Principle	Applications
Manual (pliers/crimper)	Mechanical action, basic adjustment	Small batches, GC/HPLC vials, 15/50 mL tubes
Motorised semi-automatic	Adjustable torque, foot pedal/lever	R&D, quality control, medium throughput
Automatic SBS rack	Multiple heads, sensors	Biobanking, HT screening, 24/48/96 cryotubes

In which fields are cappers/decappers used?

• Life sciences/biobanking: opening/recapping cryotubes in SBS racks, 2D traceability, biobank integrity.
• Pharmaceutical/biotech: sample preparation, GLP/GMP compliance, torque control to prevent leaks/contamination.
• Food/environmental: series of microtubes and vials for residue, water and soil analyses.
• Chemistry/analytical: precise crimping of GC/HPLC vials, septa/PTFE compatibility.
• Cosmetics: pilot batches, stability, repeatable opening/closing.
Cross-functional benefits: ergonomics (fewer MSDs), sealing quality, time savings and fewer human errors.

The different types of cappers/decappers available

Decapper/Capper

Frequently asked questions about laboratory cappers/decappers

Crimp or screw: which system should you choose?
GC/HPLC vials generally favour crimping (maximum leak-tightness). Routine tubes use screw caps for speed and ease of reopening.

How should tightening torque be set?
Follow the tube/cap recommendations. Too low = leakage; too high = deformation/breakage. Motorised models offer reliable presets.

Can I use a decapper in a safety enclosure?
Yes, if it is compact, compatible with a Class II BSC and aerosol dispersion is controlled. Prefer a splash guard and stainless-steel surfaces.

What about compatibility with 24/48/96 racks?
Check the SBS standard, thread type (internal/external) and tube height. Multi-position heads must match the exact format.

Does recapping affect integrity?
With controlled torque and suitable caps, leak-tightness remains optimal. Replace any damaged cap or pierced septum.

How should the device be maintained?
Clean/disinfect regularly, calibrate torque, inspect jaws and replace wear parts. Follow a documented GLP plan.

What throughput can be expected?
Depending on the model: from occasional batches to several hundred or even more than 1,000 tubes/hour. The number of heads and degree of automation make the difference.