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FEINGOSIL 105 is a two-component RTV-2 silicone rubber that cures by condensation. Its Shore 05 hardness is ideal for casting and making flexible, detailed moulds with strong undercuts.
FEINGOSIL 105 is a two-component, condensation-curing silicone rubber. This high-quality material offers excellent accuracy and high elasticity, making it an ideal choice for making silicone molds with deep undercuts.
Its high stability and flexibility allow easy demolding, even on complex shapes. It’s especially suited to both professionals and individuals who need faithful reproduction across many fields (crafts, industry, prototyping).
This molding silicone allows casting materials such as gypsum-based products, waxes, reconstituted stone, as well as polyester, epoxy, or polyurethane resins, ensuring excellent compatibility.
Very flexible molds for candles and containers
Casting complex parts with deep undercuts
Molds for resin, plaster, concrete, wax, and soap
Reproduction of detailed parts (small and large runs)
Making molds for figurines, sculptures, and prototypes
Flexible molds for decorative and technical objects
If the surface of the model to reproduce is porous (wood/plaster/ceramic/etc.), it’s recommended to apply a coat of varnish, a release agent, or a release wax to prevent any sticking.
Build a formwork around the object to reproduce and make sure to leave enough space to hold the silicone (wall thickness between 4 and 10 mm).
Carefully check the formwork is watertight to avoid any disaster.
Make sure the object is firmly fixed to the base to prevent it from moving or floating during pouring.
In a clean, dry container, weigh out the quantity of silicone required and calculate an addition of 5% catalyst (e.g.: 100gr silicone + 5gr catalyst).
Using a spatula, mix the two components until a HOMOGENEOUS colored paste is obtained.
With mechanical assistance, keep the speed low (300 to 500 rpm) for 2 to 3 minutes and keep the mixer head in the silicone to limit the incorporation of air bubbles.
Aim for the lowest point and pour the silicone in a thin vein.
The first coat can be applied directly with a brush, then the rest of the mold can be filled.
Let it cure at room temperature.
Demolding is possible after 24 hours.
⚠️ Do not move the formwork during this phase to ensure good mold stability.
For resins (epoxy, polyester, polyurethane), a 48-hour rest time is recommended to optimize resistance to heat and chemical stress.
Don’t try to clean liquid silicone; you’ll be able to peel it off the tools once it’s dry.
Mixing ratio: 5% (e.g. 100gr silicone + 5gr Catalyst E)
Appearance: viscous liquid
Hardness (Shore A): 05
Pot life at 23°C: 10′ Catalyst Fast / 90′ Catalyst Slow
Demolding: 2 – 24h Catalyst Fast / minimum 24h Catalyst Slow
Viscosity (mPa.s): 25000
Density (g/cm³): 1.12
Color uncatalyzed: white
Elongation (%): 700
Linear shrinkage (%): < 0.7
Shelf-life: 12 months in original packaging between 5°C and 25°C.
Packaging: sold by kit (A+B): 1kg + 50 gr/ 5 kg + 250 gr/ 20 kg+1kg
Product from Feinchemica’s silicone range, known for reliability and top service.
For any questions about application, delivery, price, or compatibility with your use, visit our website or contact us by phone.
Our team supports you in your project and makes it easier to navigate our solutions.
Thixotrope (thickener): is added to the mix (A+B) to obtain a paste-like texture for vertical applications.
Silicone oil
Release spray ensures quick, optimal demolding.
Release wax
Wear protective gloves and make sure to work in a ventilated area.
Skin contact: wash thoroughly with soap and water. Remove and wash contaminated clothing. Consult a doctor if you develop a rash.
Eye contact: rinse eyes thoroughly with running water. Consult a doctor if irritation persists.
