美国Sterlitech EPA PM 2.5 PTFE Filters, 46.2mm; 50/Pk PTFE滤膜：
PM 2.5 PTFE 膜过滤器专为 PM 2.5 环境空气监测而设计。这些高纯度、薄过滤器按顺序编号，并带有耐化学腐蚀的聚丙烯支撑环。
美国Sterlitech EPA PM 2.5 PTFE Filters, 46.2mm; 50/Pk PTFE滤膜规格：
EPA PM2.5空气监测膜过滤器规范
| Alkalinity Max. | 25 µeq/g of filter Test Method: Section 2.12 EPA/600/R-94/038b |
| Complete Packsize | 50 Pieces |
| Material | Polytetrafluoroethylene (PTFE) |
| Particle Retention [0.3 µm] Min. | 99.7% Test Method: ASTM D 2986-95a |
| Pore Size | 2 µm |
| Support Ring | Yes |
| Support Ring Material | Polypropylene (PP) |
| Support Ring Width | 3.68 mm ± 0.00 to 0.51 |
| Total Support Ring Thickness | 0.38 mm ± 0.04 |
