Specifications: TORK 5-minute epoxy steel is a two component epoxy material that cures by chemical reaction between the resin and hardener. The result is an extremely strong, fast curing material that is suitable for production bonding as well as other bonding applications that require strenght and speed. In addition to production and repair bonding, 5-minute steel is used for prototype bonding where the speed of cure allows rapid prototype assembly. 1 to 1 Mixing Ratio. By weight or volume, 5-minute steel is a simple 1 to 1 ratio. Just measure equal parts of hardener and resin, mix and apply.