Zhejiang ALWSCI Technologies Co., Ltd.
Syringe Filters, HPLC Vials & Septa — Specified for Analytical Laboratories
200+ production lines · 48 patents · ISO 9001 / 14001 / 45001 / 13485 / 17025 · exporting to 110+ countries. Labfil® syringe filters, ALWSCI® vials, caps & septa, and Varefied™ certified consumables — with full batch traceability.
Product Lines — Specifications at a Glance
Syringe Filters
| Series | Welded / Economy / Sterile |
| Membranes | Nylon, PTFE, PVDF, PES, MCE, CA, RC, GF |
| Pore sizes | 0.22 / 0.45 / 5.0 µm |
| Diameters | 4 / 13 / 25 / 33 mm |
Autosampler Vials
| Volumes | 1 / 2 / 4 / 10 / 20 mL (+ high recovery) |
| Threads | 8-425 / 9-425 / 10-425 / 13-425 |
| Closures | Screw / 11mm crimp / 11mm snap |
| Glass | Type I borosilicate, clear / amber |
Caps & Septa
| Cap sizes | 8 / 9 / 11 / 13 / 18 / 20 / 24 mm |
| Septa | PTFE/silicone, PTFE/red rubber, butyl |
| Formats | Pre-slit, bonded, molded |
| Temp. range | up to 200–225 °C (material dependent) |
Membrane × Solvent Compatibility Matrix
The signature selection tool of this site. Match your solvent to the membrane before you order — an incompatible pairing is a common source of extractables in HPLC sample prep.
| Membrane | Aqueous | Alcohols | Acetonitrile | THF / DMF | Strong acids |
|---|---|---|---|---|---|
| Nylon | ● | ● | ● | ✕ | ✕ |
| PTFE | ● | ● | ● | ● | ● |
| PVDF | ● | ● | ● | △ | ✕ |
| PES | ● | ● | △ | ✕ | ✕ |
| MCE | ● | △ | ✕ | ✕ | ✕ |
| CA | ● | △ | ✕ | ✕ | ✕ |
● compatible △ limited — verify with your method ✕ not recommended. Full guide: Membrane Selection Guide.
Septa Selection Table
| Septa | Max temp | Reseal | Notes |
|---|---|---|---|
| PTFE | 225 °C | Single use | Inert, economical |
| PTFE / silicone | 200 °C | Multiple injections | Best reseal; avoid chlorosilanes |
| PTFE / silicone, pre-slit | 200 °C | Multiple injections | Less coring, reduced vacuum |
| PTFE / red rubber | 90 °C | Temporary | Low cost; ketones & acids OK |
| Butyl rubber | 100 °C | Low pressure | Headspace vials; avoid chlorinated solvents |
Certifications & Testing
| Certificate | Scope |
|---|---|
ISO 9001:2015 | Quality management |
ISO 14001:2015 | Environmental management |
ISO 45001:2018 | Occupational health & safety |
ISO 13485:2016 | Medical devices quality |
ISO/IEC 17025:2017 | Testing laboratory competence |
Bureau Veritas | Factory inspection report |
SGS / COA / MSDS | Product quality documentation |
Certificates are issued per batch where applicable: COA accompanies every shipment, and batch samples are retained for at least 2 years.
Scope & Limits — Read Before You Inquire
- Minimum order: no hard MOQ; for overseas orders we recommend at least 1,000 pcs per item because freight dominates small parcels.
- Lead time: 2–5 days for stock items; 15–25 days for production; 30–90 days for ODM/OEM projects.
- Custom work (dimensions, materials, colors, logo/barcode printing, molds, silanization, ultra-clean treatment) requires drawings or samples for quotation.
- What we do not do: we do not sell analytical instruments; we do not provide method development as a standalone service.
Need specifications or a quotation?
Send your membrane, pore size, vial thread or drawing — our engineers respond with matched specifications.
Get a Quote sales@syringefilterpro.com