SILISIL RTV MF-Soft 12

SILISIL ·

SILISIL RTV MF-Soft 12 is a room-temperature vulcanizing 2-component addition-cure silicone (platinum-catalyzed, RTV-2) from the MF-Mold & Form series — soft pad printing silicone Shore A 12, blue — very good color release.

The mixture is prepared in a ratio of 1:1 by weight (tolerance ±5%). Pot life at 23 °C approx. 20 minutes, demolding after approx. 90 minutes, complete curing after 24 hours. Temperature resistance –40 °C to +200 °C.

Key property

Pad printing compatible with excellent ink release — Shore A 12 and 550% elongation at break guarantee stable printing and long service life of the printing pads.

SILISIL RTV MF-Soft 12 in figures

A 12

Shore Hardness

3'500

mPa·s viscosity

20 min

Pot life @23 °C

550 %

Elongation at break

What sets SILISIL RTV MF-Soft 12 apart

Very good flowability

Excellent flowability — suitable for detailed models and microstructures.

Very good ink transfer for pad printing

Excellent ink release — clean ink transfer from the cliché to the workpiece.

High mechanical resistance

High mechanical strength — robust mold with consistent properties under load.

Very good elastic recovery behavior

Stable recovery after printing — consistent print quality over thousands of pad printing cycles.

Elongation at break 550%

High elasticity — reliable demolding of complex geometries without damaging the mold or the original.

Temperature resistance −40 to +200 °C

Extended application range for hot wax applications and mold storage in extreme climates.

What is SILISIL RTV MF-Soft 12 used for?

Soft printing pads for pad printing

Soft silicone pads (Shore A 12, industry standard) for precise ink transfer from the cliché to plastic, glass, and metal parts.

High-fidelity reproduction molds

Excellent flowability (3'500 mPa·s) for microscopic detail reproduction in small and medium series.

Soft-touch components and membranes

Flexible industrial components with high elongation at break (550 %) and excellent recovery — keyboards, control membranes, grippers.

Skin simulation for training models

Anatomical teaching and simulation models in medical and nursing education — soft tactile feel with durable mechanical stability.

Vibration and acoustic damping

Industrial dampers and bearings with high deformability and recovery — precise mechanical decoupling.

Multi-layer molds for complex undercuts

Tear-resistant layers can be built up on top of each other and safely demolded — suitable for multi-part tools.

Processing

Prepare the original

The surface to be reproduced must be clean, dry, and free of dust. The ideal processing temperature is 23 °C — cooler environments significantly extend pot life and curing time.

Homogenize and mix components

Stir base and catalyst thoroughly before use. Weigh out 1:1 by weight (tolerance ±5%). When mixing, thoroughly incorporate the walls and bottom of the container.

Vacuum degassing

For pore-free molds, briefly degas the mixture under vacuum — entrapped air bubbles are removed, ensuring a smooth mold surface.

Pour slowly into the mold

Pour from a height of approx. 30 cm in a thin stream into the deepest point — the silicone displaces air independently and reaches all undercuts.

Vulcanize and demold

At 23 °C, demolding is possible after approx. 90 minutes, with complete curing after 24 hours. Before the first pour, allow a 24 h "maturation phase" for maximum strength.

Data Sheets & Safety Data Sheet

Complete TDS and SDS in DE, EN, FR — view or download directly.

To the documents →

Important Notes

Avoid crosslinking inhibitors

Addition-cure systems such as MF-Soft 12 are sensitive to sulfur, amine, tin, and phosphorus compounds — especially latex gloves, modeling compounds, adhesive tapes, and some paints. When in doubt, perform a small test pour before use.

Storage and Shelf Life

Shelf life of at least 12 months in unopened original container when stored in a dry, cool place (10–25 °C). Consult the Safety Data Sheet (SDS) before opening.

Available containers

1 kg + 1 kg, 5 kg + 5 kg, 25 kg + 25 kg, 200 kg + 200 kg. Other container sizes available on request.

Compatibility

Compatible with polyurethane, epoxy, and polyester casting resins. For aggressive resins, apply a release agent to protect the mold.

Recommended accessories

SILISIL white petroleum jelly release paste

Universal release agent for polyester, epoxy, and polyurethane casts — protects the silicone mold from aggressive resins and extends mold service life.

To the product →

SILISIL Delayer PA

Retarder for addition-curing silicones — extends pot life and setting time for more complex multi-part builds and relaxed processing.

To the product →

SILISIL Silicone Remover

Cleaning agent for silicone residues on tools, models, and work surfaces — gentle and effective.

To the product →

Which MF silicone for which application?

SILISIL RTV MF-Soft 12 in direct comparison with related MF products from our range (MF = Mold & Form).

	MF-Soft 12 Current Product	MF-Soft 00 →	MF-Soft 13 TP →	MF-Dura 32 →
Shore hardness A	12	0	13	32
Mixed viscosity	3'500	1'500	4'500	6'000
Color	Blue	Translucent	Translucent	Brown Red
Pot life @23 °C	20	5–7	45	10

Topics & Application Fields

Key terms related to this product. Also useful for our search and filters.

Mold Making SILISIL Silicone RTV-2 Swiss Stock Addition Platinum Prototyping Shore A 12 Swiss Brand 2K Molding / Mold Making

Technical data for SILISIL RTV MF-Soft 12

All 18 Product Information 4 Physical Properties 4 Electrical Properties 1 Curing Values 3 Product Approvals 3 Mechanical Properties 3

Product Information
Brand	SILISIL
Mixing Ratio	1:1
Curing type	Addition (Platinum)
Container	1 kg + 1 kg, 5 kg + 5 kg, 10 kg + 10 kg, 25 kg + 25 kg

Physical Properties
Cured Color	Blue
Self-leveling	Yes
Density (g/cm³)	1.1
Uncrosslinked viscosity (mPa·s)	3500

Electrical Properties
Electrical Insulation	Yes

Curing values
Pot life (min)	20
Demolding time (min)	90
Full cure (h)	24

Product Approvals
Food contact	No
Medical grade	No
Certificates	RoHS, REACH

Mechanical properties
Shore hardness A (cured)	A 12
Tensile strength (MPa)	8.6
Elongation at break (%)	550

Please refer to the technical data sheet (TDS) in the "Documents" tab for binding values.

Documents and data sheets

Click on a document for the preview or the download icon for direct download.

Technical Data Sheets (TDS) 3

SILISIL RTV MF-Soft 12 - Technisches Datenblatt DE.pdf

125 KB

SILISIL RTV MF-Soft 12 - Technical Data Sheet EN.pdf

125 KB

SILISIL RTV MF-Soft 12 - Fiche Technique FR.pdf

125 KB

Frequently Asked Questions about SILISIL RTV MF-Soft 12

Practical application and design questions — answered by SILITECH.

What is SILISIL RTV MF-Soft 12 suitable for?

SILISIL RTV MF-Soft 12 is a 2K addition-curing silicone (Shore A 12, blue) for soft printing pads for pad printing and related applications. Soft pad printing silicone Shore A 12, blue — very good ink release

What are the pot life and demolding time of MF-Soft 12?

At 23 °C, the pot life is approx. 20 minutes and the demolding time approx. 90 minutes. Full curing is achieved after 24 hours. Lower temperatures extend these values, higher temperatures shorten them.

Which materials should be avoided with MF-Soft 12?

As an addition-curing system, SILISIL RTV MF-Soft 12 is sensitive to crosslinking inhibitors: sulfur, amine, tin, and phosphorus compounds can locally stop vulcanization. Avoid latex gloves, sulfur-containing modeling compounds, certain adhesive tapes, and PVC plasticizers in the immediate vicinity of the mold. When in doubt, perform a small test pour.

In what mixing ratio is MF-Soft 12 processed?

SILISIL RTV MF-Soft 12 is mixed in a 1:1 ratio by weight (base to catalyst), with a tolerance of maximum ±5%. Homogenize both components separately before mixing, then incorporate thoroughly — including container walls and bottom. A brief vacuum degassing of the mixture is recommended for pore-free molds.

What Shore hardness and mechanical values does MF-Soft 12 have?

SILISIL RTV MF-Soft 12 achieves a Shore A hardness of 12 (ASTM D 2240), a tear strength of 8.6 N/mm² (ASTM D 412), an elongation at break of approx. 550%, and a tear resistance of 8.6 N/mm (ASTM D 624).

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Product Specifications

Product Information
Container	1 kg + 1 kg or 5 kg + 5 kg or 10 kg + 10 kg or 25 kg + 25 kg
Brand	SILISIL
Mixing Ratio	1:1
Curing type	Addition (Platinum)

Physical Properties
Cured Color	Blue
Self-leveling	Yes
Density (g/cm³)	1.1
Uncrosslinked viscosity (mPa·s)	3500

Electrical Properties
Electrical Insulation	Yes

Curing values
Pot life (min)	20
Demolding time (min)	90
Full cure (h)	24

Product Approvals
Certificates	RoHS or REACH
Food contact	No
Medical grade	No

Mechanical properties
Shore hardness A (cured)	A 12
Tensile strength (MPa)	8.6
Elongation at break (%)	550

Keywords
Keywords	Mold Making SILISIL Silicone RTV-2 Swiss Stock Addition Platinum Prototyping Shore A 12 Swiss Brand 2K Molding / Mold Making

Documents and data sheets

Safety Data Sheets (SDS) and Technical Data Sheets (TDS) for download:

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SILISIL RTV MF-Soft 12

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Documents

Shipping & Delivery

Product data

What sets SILISIL RTV MF-Soft 12 apart

What is SILISIL RTV MF-Soft 12 used for?

Processing

Important Notes

Recommended accessories

Which MF silicone for which application?

Technical data for SILISIL RTV MF-Soft 12

Documents and data sheets

Technical Data Sheets (TDS) 3

Frequently Asked Questions about SILISIL RTV MF-Soft 12

Your question not covered?

Product Specifications

Documents and data sheets