Nirmala Filaments [INDIA] Pvt Ltd. Offers Poly Propylene Monofilament. Nirmala Filaments [INDIA] Pvt Ltd. Has an ISO 9002 certification. Poly Poly Propylene Monofilament is used in various industrial monofilaments. Propylene Monofilament is available in Nylon 6, Nylon 66, Polyester and HDPE types.