Filter-sterilization is not recommended for Poly (I:C) solutions. Should a sterile Poly (I:C) solution be required, see product II3036, a sterile 10% solution. Please see the following link to review additional information available in the product datasheet:
https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/112/503/p1530pis-ms.pdf
Please see the link below to review the γ-irradiated 10% Poly (I:C) solution:
https://www.sigmaaldrich.com/product/sigma/i3036

