Semi-refined Kappa carrageenan is a natural linear sulfated polysaccharide extracted from red algae such as Chondrus crispus, Kappaphycus alvarezii, and Eucheuma cottonii through processes including alkali treatment, washing, drying, and grinding. It possesses a unique gel-forming ability.

Semi-refined Kappa carrageenan can form thermally reversible gels of moderate strength, exhibiting various functionalities such as gelling, stabilizing, thickening, water retention, and emulsification. It is widely applied in products such as meat products, dairy products, and pet food.