Overview
Amber sample vials are essential laboratory consumables designed to shield light-sensitive compounds from UV degradation. Their brown-tinted borosilicate glass blocks wavelengths up to 450 nm, making them ideal for HPLC, GC, and pharmaceutical applications. These vials often feature standardized necks (e.g., 12-425 thread) for compatibility with autosamplers. Available in volumes ranging from 1.5 mL to 40 mL, they are commonly paired with PTFE/silicone septa for inert sample storage. The amber coloration is achieved through controlled additives during glass manufacturing, ensuring consistent UV protection without compromising clarity for visual inspection.
Physical and Chemical Properties
Amber vials are manufactured from Type I borosilicate glass, offering high thermal shock resistance (up to 300°C) and low extractables. The glass composition includes iron oxides to produce the light-blocking tint, which typically absorbs 90% of UV light below 400 nm. Standard vials withstand pressures up to 100 psi (crimped) or 60 psi (screw cap). They exhibit excellent chemical resistance to acids, bases, and organic solvents, though prolonged exposure to strong alkalis (e.g., NaOH >1M) may cause surface etching. Density ranges from 2.2–2.5 g/cm³ depending on wall thickness.
Main Applications
Primary uses include HPLC/GC sample storage, where protection against photo-degradation is critical for compounds like vitamins (A, B12), nitroaromatics, or tetracyclines. Pharmaceutical labs utilize them for stability testing under ICH Q1B guidelines. In environmental analysis, they preserve light-sensitive pesticides (e.g., organophosphates) during transport. Amber vials also serve in forensic toxicology for chain-of-custody samples. Specialty applications include cannabis testing (THC/CBD protection) and photochemical reaction quenching.
Safety and Storage
Always inspect vials for cracks or chips before use to prevent leakage. Store upright in low-humidity environments to preserve septa integrity. For volatile samples, use crimp caps with PTFE-faced septa and consider secondary containment. UV protection diminishes if the amber glass is scratched—avoid abrasive cleaning. Autoclaving is possible (121°C, 15 psi) but may reduce septa lifespan. Dispose of broken vials in puncture-resistant containers due to glass hazards.
B2B Procurement Guide
When sourcing in bulk (100+ units), verify: 1) ISO 9001/13485 certification for pharmaceutical use, 2) lot-to-lot color consistency via spectrophotometric testing, and 3) USP <660> compliance for extractables. Leading manufacturers include Wheaton, Agilent, and Restek. Consider purchasing pre-assembled kits (vial+cap+septa) to reduce contamination risks. MOQs typically start at 500 units, with 4–6 week lead times for custom engraving or sizing. For reference, 2 mL vials cost $0.80–$1.20 each in 1,000-unit quantities.
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