Whatman Polycap 36TF Capsule Filter, 0.45um, Non-Sterile, PTFE Filter Membrane. $89.75. Add to cart More. Add to Compare. $85.00. Whatman Polycap 36TF Capsule Filter, 1.0um. Whatman Polycap 36TF Capsule Filter, 1.0um (NO filling bell), non-sterile (may be autoclaved once), hydrophobic PTFE membrane filter. $85.00. Add to cart More.