Micro cuvettes

The choice of material is critical for optical accuracy. Optical Glass is suitable for the visible range (340-2500nm), while Quartz (Suprasil) is essential for UV applications (190-2500nm) due to its high transparency and chemical resistance. For high-throughput screening or disposable needs, UV-grade Polystyrene (PS) or Polymethyl Methacrylate (PMMA) are cost-effective, provided they are compatible with the solvents used.

Standard micro cuvettes typically have an outer dimension of 12.5 x 12.5 mm, but the Z-dimension (light path height) varies between instruments (commonly 8.5mm or 15mm). You must verify the Z-dimension of your equipment to ensure the light beam passes through the center of the sample volume. Additionally, confirm the path length (standard is 10mm) and sample volume requirements (typically 10μl to 500μl for micro versions).

Suppliers should ideally hold ISO 9001 for quality management and ISO 13485 if the cuvettes are intended for medical diagnostic use. For high-precision quartz cuvettes, look for path length tolerance of ±0.01mm or better. Ensure the products are DNase/RNase-free and pyrogen-free if you are performing molecular biology or PCR-related work.

Black-walled (masked) cuvettes are designed to eliminate stray light by absorbing radiation that does not pass through the sample aperture, which is vital for low-volume measurements to maintain a high signal-to-noise ratio. Clear-walled cuvettes are generally used for standard applications where stray light is less of a concern or for side-angle measurements like fluorescence.

Micro cuvettes, especially quartz ones, are highly fragile. Insist on multi-layer protective packaging, including vacuum-sealed inner boxes and shock-absorbent foam. For bulk orders, specify palletized shipping to minimize manual handling. It is highly recommended to use Made-in-China.com's Secured Trading services to ensure recourse if goods arrive damaged.

Focus on sample validation before committing to a bulk purchase. Request a Certificate of Analysis (COA) for the specific batch. When discussing price, clarify if the quote includes customized branding (OEM) or specialized cleaning/sterilization. For long-term partnerships, negotiate a graduated pricing scale where the unit price drops as your annual cumulative volume increases.

Always conduct transactions through verified channels and use Trade Terms (Incoterms) like FOB or CIF to clearly define risk transfer. Verify the supplier's Business License and Export Qualification on the platform. Avoid direct wire transfers to private accounts; instead, use the secure payment gateways provided by professional B2B platforms like Made-in-China.com to protect your capital.

Ensure the HS Code (typically 7017 for laboratory glassware or 3926 for plastic) is correctly declared to avoid delays. Provide a clear Commercial Invoice and Packing List that specifies the material type. Be aware of specific import regulations in your country regarding medical-grade plastics or glass, which may require additional health and safety declarations.