PSF confirming to US FDA 21 CFR. Autoclavable Perform high throughput particle and microbiological QC testing using the Tarsons Reusable Filter Funnel with Clamp. The quick release clamp provides fast and easy retrieval of membranes for efficient processing of large numbers of samples. The durable, break-resistant polysulfone funnel is strong, non-toxic and can be repeatedly washed and autoclaved.