95 1085 Silastic Rtv 3110 3112 3120 Mould1

SILASTIC™ RTV-3100 Series are pourable rubber bases that become firm, flexible silicone rubber when cured. There is a choice of three catalysts to select from in order to tailor your working times and cure rates. SILASTIC™ RTV-3100 Series:  Is easily mixed and poured  Cures at room temperature in any thickness  Gives accurate reproduction of masters for moldmaking  Provides a wide service temperature range Catalysts A common catalyst concentration is 10:1 base to catalyst by weight, which assures more accurate measuring and mixing of catalyst. Varying the catalyst concentration will change the curing rate as indicated on Table 1. Decreasing the catalyst level will slow the cure and give longer working and demold times. Keep all catalyst containers tightly closed when not in use. Note: A 10:1 mixing ratio is not recommended for DOWSIL™ 4 Catalyst or SILASTIC™ RTV-3000 F Catalyst. Do not use SILASTIC™ RTV-3010-S Catalyst or SILASTIC™ RTV- 3000 F Catalyst when molding polyesters because the polyester can be inhibited. DOWSIL™ 4 Catalyst is recommended for polyester molds. ®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow SILASTIC™ RTV-3110 Mold-Making Base, SILASTIC™ RTV-3112 Mold-Making Base, SILASTIC™ RTV-3120 Mold-Making Base Page 3 of 6 © 2017–2025 The Dow Chemical Company. All rights reserved. Form No. 95-1085-01-1225 S2D Table 1: Base/Catalyst Ratios, Working Times and Demold Times Base/Catalyst Mixing Ratio by Weight Approximate Working Time Approximate Demold Time SILASTIC™ RTV-3110 Base SILASTIC™ RTV-3010-S Catalyst 5:1 10:1 20:1 1 hour 2 hours 3 hours 5 hours 7 hours 12 hours SILASTIC™ RTV-3000 F Catalyst 10:1 20:1 10 minutes 40 minutes 27 minutes 80 minutes DOWSIL™ 4 Catalyst 100:1 200:1 400:1 3 minutes 5 minutes 20 minutes 10 minutes 20 minutes 2 hours SILASTIC™ RTV-3112 Base SILASTIC™ RTV-3010-S Catalyst 5:1 10:1 20:1 30 minutes 1 hour 2 hours 6 hours 8 hours 12 hours SILASTIC™ RTV-3000 F Catalyst 10:1 20:1 12 minutes 28 minutes 37 minutes 100 minutes DOWSIL™ 4 Catalyst 100:1 200:1 400:1 2 minutes 5 minutes 15 minutes 10 minutes 20 minutes 1½ hours SILASTIC™ RTV-3120 Base SILASTIC™ RTV-3010-S Catalyst 5:1 10:1 20:1 30 minutes 1 hour 2 hours 6 hours 8 hours 12 hours SILASTIC™ RTV-3000 F Catalyst 10:1 20:1 8 minutes 25 minutes 25 minutes 1½ hours DOWSIL™ 4 Catalyst 100:1 200:1 400:1 2 minutes 5 minutes 15 minutes 10 minutes 30 minutes 2½ hours How to Use Substrate Penetration The surface of the original should be clean and free of loose material. If necessary, and in particular with porous substrates, use a suitable release agent such as petroleum jelly or soap solution. Mixing Thoroughly stir SILASTIC™ RTV-3100 Series bases before using, as filler separation may occur upon prolonged standing. Weigh the base and appropriate catalyst into a clean container, mix together until the catalyst is completely dispersed in the base. Hand or mechanical mixing can be used, but do not mix for an extended period of time or allow the temperature to exceed 35°C (95°F). ®™Trademark of The Dow Chemical Company (“Dow”) or an affiliated company of Dow SILASTIC™ RTV-3110 Mold-Making Base, SILASTIC™ RTV-3112 Mold-Making Base, SILASTIC™ RTV-3120 Mold-Making Base Page 4 of 6 © 2017–2025 The Dow Chemical Company. All rights reserved. Form No. 95-1085-01-1225 S2D How to Use (Cont.) Mixing (Cont.) With the exception of SILASTIC™ RTV-3110 Base, it is strongly recommended that entrapped air be removed in a vacuum chamber, allowing the mix to completely expand and then collapse. A vacuum of at least 28 inches of mercury should be held until most bubbling has ceased. After an additional 1–2 minutes under vacuum, the mix should be inspected and if free of air bubbles, can then be used. A volume increase of 3–5 times will occur on vacuum de-airing the mixtures, so a suitably large container should be chosen. Caution: Prolonged vacuum will remove volatile components from the mix and may result in poor thick section and non-typical

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