Polycap SPF (Serum Pre-Filter) is an exceptional product that is optimized for pre-filtration applications and is typically used upstream of a Polycap AS or Polycap PES capsule. Ideal for hard-to-filter solutions such as serums and protein solutions. Suitable for filtering serums, viral suspensions, nutrients, biologicals, immunologicals, enzymes and buffers. Polycap 36 SPF has a filtration area of 260 cm2, Polycap 75 has 535 cm2. Autoclavable. Connection codes: (S) = stepped barb, ¼" to 3/8" tubing, (H) = ½ " hose barb.