Shin-Etsu KE-1604 Mold-Making Silicone, 180 Kilogram Drum

Shin-Etsu KE-1604 is a two-component mold making silicone engineered for high-strength, high-hardness tooling and selected potting work. Paired with CAT-1604 catalyst at a 100:10 mix ratio by weight, this addition-cure system delivers a Shore A 60 rubber with 4.7 MPa tensile strength, 20 kN/m tear strength, and 300 percent elongation, specs that hold up through repeated demolding cycles. It ships in a 180 kilogram drum for shops running production volume.

KE-1604 Mold Making Silicone Features

• Two-component, addition-cure mold making silicone
• 100:10 mix ratio by weight with CAT-1604 catalyst
• Shore A 60 hardness for rigid, dimensionally stable molds
• 4.7 MPa tensile strength and 20 kN/m tear strength
• 300 percent elongation for clean part release
• 1.5 hour working time at room temperature
• Accelerated cure available: 10 minutes at 100 degrees C
• Usable temperature range from minus 40 to 180 degrees C
• Blue color for easy visual inspection of the cured mold

Popular Uses for This Mold Making Silicone

This mold making silicone is built for tooling that needs more rigidity than a soft, highly flexible mold. Shops reach for it when casting urethane foams and other organic plastic resins, where low shrinkage and easy release matter over many repeated pours.

• Production mold making for urethane foam casting
• Tooling for organic plastic resin parts
• Selected potting projects that call for a firm silicone body
• Molds for repeated, high-volume demolding cycles
• Art and prop casting where dimensional stability matters

Mix Ratio and Cure

Combine KE-1604 and CAT-1604 at a 100:10 ratio by weight. Weigh each component accurately and mix until the color and texture are uniform, scraping the sides and bottom of the container. The 1.5 hour working time gives room for mixing, vacuum degassing when needed, and controlled pouring. For faster turnaround, the accelerated cure schedule is 10 minutes at 100 degrees C, provided the master and any inserts can tolerate that temperature.

Physical Properties

• Color: Blue
• Cure chemistry: Addition cure
• Mix ratio by weight: 100:10
• Working time: 1.5 hours
• Shore A hardness: 60
• Tensile strength: 4.7 MPa
• Tear strength: 20 kN/m
• Elongation: 300 percent
• Usable temperature range: -40 F to 356 F (-40 C to 180 C)

Application Notes

Secure the master and seal any path that could let liquid escape before pouring. Pour from a single location and let the material front advance around details so trapped air has a route out. Addition-cure silicones can be sensitive to contaminants, so run a small cure test against every master, release surface, pigment, and processing aid before a full batch.

Questions on catalyst ratio, mold hardness, or cure planning for your process? Call Perigee Direct at (817) 381-9398 or email sales@perigeedirect.com.

FOR INDUSTRIAL USE ONLY. Refer to the SDS prior to use.