CALCIUM GLUCONATE 2.5% GEL Calcium Gluconate â?? 2.5 % w/w in a specialized gel base. is an effective topical 2.5% calcium gluconate gel that is used in first aid response to hydrofluoric acid (HF) exposure or contact to the body. Calcium gluconate combines with hydrofluoric acid to neutralize the powerful fluoride ion. PRODUCT FEATURES â?¢ Non-toxic â?¢ Non-hazardous â?¢ Non-flammable â?¢ Non-irritating â?¢ Highly effective â?¢ Eco-friendly â?¢ Faster results â?¢ Biodegradable â?¢ Cost competitive