50 * 50mm PTFE (Teflon) Back Catalog number: 8644T-50 Manufacturer: Sampling Systems Availability: In the manufacturer's stock Price on request - + Recommended 8644N-50 50 * 50mm Nylon (Polyamide) 6/6, FDA Grade, Price on request 8700S-04 200mm Sieve. 850micron Price on request 8644N-100 100 * 100mm Nylon (Polyamide) 6/6, FDA Grade, Price on request