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SILICONE RTV FOR MOLDING – FEINGOSIL 120

FEINGOSIL 120 is a two-component RTV-2 silicone that cross-links by condensation.

Its Shore 20 hardness is ideal for molding and the manufacture of soft, detailed molds with low undercuts.

 23,98 349,32 HTVA

SKU N/A Categories ,

Description

FEINGOSIL 120 is a two-component, condensation-curing silicone rubber.

This RTV silicone has been the Feinchemica brand’s benchmark for 20 years, winning over customers with its high precision and exceptional tear resistance. It’s our favorite silicone for simple molds with low undercuts.

This silicone enables the casting of base materials such as gypsum-based products, waxes or reconstituted stone, but is also suitable for polyester, epoxy or polyurethane resin replicas.

Feingosil 120 withstands heat well, so if you need high-temperature casting materials such as tin (~ 231.9°C) and lead (327°C), please turn to HT silicone, and add this incredible silicone resistant to low-melting alloys to your basket.

Features

Mixing ratio: 5% (e.g.: 100gr silicone + 5gr catalyst E)

Appearance: viscous liquid

Hardness (Shore A): 20

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): 1.14

Color uncatalyzed: white /fast: red/ slow: blue

Elongation (%): 550

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

Additives

A. The thixotropic

is added to the mixture (A+B) to adjust its texture. A layer of silicone can then be applied without running off the surface of the mold. Mixing ratio: Add 1 to 3% thixo to the A+B silicone mix.

B. Catalyst slow blue 90

The catalyst triggers the chemical reaction that hardens the silicone, transforming the liquid silicone into a solid, flexible material. The “slow-setting” catalyst offers a longer, more comfortable working time.

C. 10′ Catalyst fast red

The “fast-setting” catalyst accelerates the curing time of the silicone, so working time is very short, but demolding can take place a few hours later.

D. Pigment

Release agent, vaseline grease & Co.

When using silicone polycondensation, we recommend working with a release agent. Various methods of protection are available.

  • Liquid or paste wax release agents

  • Silicone-free release spray

  • Liquid soap, black soap or dish soap

  • Polyvinyl alcohol (PVA)

  • Vaseline grease, liquid or cream vaseline

Mould making

1.surface preparation

If the surface of the model is porous (wood/plaster/etc.), it is advisable to apply a coat of varnish or release agent to prevent the silicone from seeping into the pores and adhering to the object.

2. Formwork

Make a form that completely surrounds the object, leaving a space of 4 to 10 mm to contain the silicone. We recommend the use of plastiline, plexiglass/polycarbonate, PVC or concrete-flex panels.

Make sure the formwork is perfectly watertight to avoid leaks or accidents.

DON’T FORGET TO GLUE the base of the object to be reproduced, to prevent the silicone from slipping underneath and causing it to float to the surface.

3.mixing silicone + catalyst

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 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.

4.pour the silicone

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.

5.curing

Allow the silicone to harden at room temperature.

Unmolding can take place the following day.

Be sure NOT to MOVE the formwork during this phase to avoid distortion.

6.Cleaning

Working tools are cleaned the following day, and silicone can be removed manually when dry.

Security

Work in a ventilated area. Wear protective gloves.

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.