This is a silicone rubber.

Specifications:

• Product Type: Silicone Rubber
• Color: Clear/Amber
• Primary Color: Clear/Amber
• Chemical Type: Elastomer
• Physical Form: Pourable Liquid
• Container Size: 454g
• Container Type: Jug
• Number of Components: 1
• Viscosity Measurement: 50mPa/s
• Shelf Life: 12month
• Applications: Conventional Production and Prototype Molds, Finished Rubber Parts, Stereolithography (SLA) Molds