Check the listing for details. Dental Porcelain Etch hydrofluoric acid etchant Etching Gel 2.5ml. Condition: New. Listed at 13.14 USD. Porcelain Etch Etching Gel Porcelain Etch green gel is coming with 9.5% hydrofluoric acid content. Quickly etchs porcelain to generate coarse surace, and improves the bonding strength between adhesive and porcelain. Indications: Etching for porcelain crown, porcelain veneers, porcelain inlay and onlay Advantages: 9.5% hydrofluoric acid Green gel, easy to identify Good product stability Easy to remove and clean without residual Packaging Specifications: Specification: 2.5ml Tip: 5 pcs Attention: Never use in mouth! Use it by wearing acid-resistant protectivegloves, protective clothing and goggles. if accidentally contactthe skin, immediately use a lot of water to rinse, serious casesshould seek further medical treatment immediately. Effect diagram of porcelain etching: Hydrofluoric acid etching time: 1. Baked porcelain 60 seconds-90 seconds 2.Casting porcelain for 20 seconds-30 seconds