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Laboratory serum vials: how can sample integrity be preserved in crimp-sealed vials?

Indispensable in QC, R&D and bioproduction, the serum vial protects your sensitive solutions and enables aseptic handling via a pierceable septum. In glass (clear or amber) or polymer, it accepts crimp finishes 13/20/32 mm with butyl stoppers (often siliconised, sometimes PTFE-faced) and aluminium caps. Sterile or depyrogenated versions, geometries compatible with lyophilisation, compliance with ISO 8362 and the pharmacopoeias: the serum vial is the benchmark for safe storage and accurate syringe dosing.

What are the different types of serum vials?

A serum vial is a small crimp-neck vial, closed with an elastomer stopper and aluminium cap, intended for storage and reconstitution of solutions under aseptic conditions. The core of the range is Type I borosilicate glass (neutral, low extractables), chosen for sensitive preparations and lyophilisation. The amber version protects against UV/Vis for photosensitive compounds.

The 13, 20 or 32 mm crimp finishes (with a blowback profile to ISO 8362) ensure a reliable seal. For closures, options include bromobutyl/chlorobutyl stoppers, sometimes siliconised or PTFE-faced to limit adsorption and extractables, and flip-off caps for quick access. Sterile ready-to-use (RTU) and depyrogenated versions reduce preparation time and particulate risk.

Selection criteria: material nature (chemistry, photostability, breakage risk), usable volume and geometry (flat finish for lyophilisation), neck and stopper type (permeation, needle compatibility), cleanliness level (bioburden, endotoxins), and process (autoclaving for glass, gamma/EtO for COP/COC). Ph. Eur./USP compliance of containers and elastomers guides selection in regulated settings.

TypePrinciple / characteristicApplications
Type I clear glassNeutral glass, very low extractables, high chemical/thermal resistanceInjectables, sensitive reagents, lyophilisation, pharmaceutical QC
Type I amber glassUV/Vis protection for photosensitive contentsVitamins, APIs, dyes, light-sensitive enzymes
COP/COCShatter-resistant, low adsorption, gamma/EtO sterilisationTransport, clinical trials, areas where breakage is critical

In which fields are serum bottles used?

• Life sciences: aliquoting of media, buffers, antibodies and standards; sampling via septum to preserve sterility.
• Pharmaceutical/biotech: pilot batches, aseptic reconstitution, in-lab fill-finish, RTU vials for GMP-like workflows.
• Quality control (QC): storage of reference standards, titration solutions, stability samples in amber or clear Type I glass.
• Diagnostics/IVD: reagents packed in crimped vials for safe dispensing and automated needle access.
• Cosmetics and fine chemicals: small batches, compatibility testing, customer samples with no risk of evaporation or contamination.
• Agri/environment: extract archiving, reference solutions, safe handling in the prep room.

Crimp sealing limits evaporation and enables repeated sampling without opening — a major advantage for traceability and sample integrity.

The different types of serum vials available

Frequently asked questions about serum vials

What’s the difference between Type I, II and III glass?
Type I (borosilicate) is the most inert; Types II/III suit less demanding applications. For sensitive products/injectables, choose Type I.

Clear or amber: which should I pick?
Amber glass shields against UV/Vis. If your product is photosensitive (vitamins, dyes, APIs), go for amber; otherwise, clear glass is sufficient.

Which neck diameter (13/20/32 mm) should I select?
It depends on volume and equipment. Ensure compatibility of stopper/cap/crimper and of the needle diameter used.

Can I lyophilise in any vial?
Favour Type I vials with suitable geometry and lyophilisation stoppers. Check process/closure compatibility.

Are vials reusable?
In regulated environments, single use is recommended. In the lab, if reusing, a full cleaning/depyrogenation cycle is required.

How can I minimise particles and endotoxins?
Select sterile/ depyrogenated (RTU) vials, handle in a clean area and use pharmacopoeia-compliant stoppers and caps.