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SILISIL RTV MF-Ultra 70

SILISIL RTV MF-Ultra 70

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SILISIL RTV MF-Ultra 70 — 2K industrial silicone Shore A 67, blue — Premium choice for the most demanding tool shapes, available from Swiss stock.

2K addition silicone Shore A 67 (blue, mixing ratio 1:10) — premium choice for the most demanding tool shapes.

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  • brand
  • Mixing ratio
  • Networking type
  • Paint has hardened
  • Self-leveling
  • Density (g/cm³)
  • Viscosity uncrosslinked (mPa·s)
  • Electrical insulation
  • Potting time (min)
  • Demolding time (min)
  • Food contact
  • Suitable for medical use
  • Certificates
  • Shore hardness A (cured)
  • Elongation at break (%)
  • Container

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Mold making SILISIL silicone RTV-2 Swiss bearing additive platinum prototyping Swiss brand 2K mold making Shore A 70

 
General Terms and Conditions.

Shipping usually within 1 to 3 business days
(availability will be confirmed after ordering)

. Express logistics. Fast and reliable within Switzerland & Europe.

Shipping from Swiss warehouse within 24 hours. Batch certificate. Invoice within 30 days (B2B). Technical support.
Shipping & Delivery

Usually 1 to 3 working days

Availability will be confirmed after order receipt.

Express logistics within Switzerland & Europe.

General Terms and Conditions →

Product data

HS code: 3910.0000

HS code: 3910.0000

SILISIL RTV MF-Ultra 70
SILISIL RTV MF-Ultra 70
SILISIL ·

SILISIL RTV MF-Ultra 70 is a room temperature vulcanizing 2-component addition silicone (platinum-curing, RTV-2) from the MF-Mold & Form series — 2K industrial silicone Shore A 67, blue — premium choice for the most demanding tool shapes.

The mixture is prepared in a 1:10 ratio by weight (tolerance ±5%). Pot life at 23°C is approximately 60 minutes, demolding is possible after approximately 24 hours, and complete curing is achieved after 24 hours. Temperature resistant from -40°C to +200°C.

Key feature

Premium tool silicone (Shore A 67) — the top class for the most demanding industrial molds with the highest mechanical and chemical resistance.

SILISIL RTV MF-Ultra 70 in figures
A 67
Shore hardness
230'000
mPa·s viscosity
60 min
Pot life @23 °C
200 %
Elongation at break

What makes SILISIL RTV MF-Ultra 70 stand out

Highest hardness Shore A 67
Premium final hardness in the SILISIL MF range — dimensionally stable under the highest mechanical stress.
Very good resistance to PU, epoxy and polyester resins
Resistant to aggressive polyurethane, epoxy and polyester resins — low mold wear.
High shape and dimensional stability
High dimensional accuracy — the shape retains its form even after prolonged storage.
Minimal shrinkage
Shrinkage during addition crosslinking — shape is immediately dimensionally stable without waiting time.
Mixing ratio 1:10 for highest precision
Simple 1:1 ratio — mixable by hand without precision scales, ideal for workshops and hobbyists.
Excellent aging and abrasion resistance
Excellent aging resistance — the shape retains its properties over years of use.

What is SILISIL RTV MF-Ultra 70 used for?

Premium tool molds for high-end industry
Shore A 67 — the highest hardness in the SILISIL MF portfolio for the most demanding tooling and industrial applications.
Aggressive resin and resin casting process
Very good chemical resistance to PU, epoxy and polyester resins — long service life even with frequent mold changes.
Injection molding preforms with the highest precision
1:10 mixing ratio and highest final hardness for precise toolmaking master models before steel or aluminum machining.
Industrial high-performance molds
Tensile strength >7 N/mm² and excellent aging/abrasion resistance — tools with service lives of years.
Abrasion- and chemical-resistant shapes
Top class for aggressive concrete, cinder block and industrial polyester castings with the highest mechanical stress.
Research & Development in Special Applications
When standard silicones reach their limits — MF-Ultra 70 is the premium choice for R&D with extreme requirements.

processing

1
Prepare the original
The surface to be reproduced must be clean, dry, and dust-free. The ideal processing temperature is 23°C — cooler environments significantly extend the pot life and curing time.
2
homogenize and mix components
Stir the base and catalyst thoroughly before use. Weigh out 1:10 by weight (tolerance ±5%). When mixing, thoroughly incorporate the mixture into the container walls and bottom.
3
Vacuum venting
For non-porous molds, briefly de-aerate the mixture under vacuum — trapped air bubbles are removed and a smooth mold surface is guaranteed.
4
Pour slowly into the mold
Pour in a thin stream from a height of approximately 30 cm into the lowest point — the silicone displaces air on its own and reaches all undercuts.
5
Vulcanizing and demolding
At 23 °C, demolding is possible after approximately 24 hours, with complete curing after 24 hours. A 24-hour "maturation phase" is required before the first casting to ensure maximum strength.
Data sheets & safety data sheet
Full TDS and SDS in DE, EN, FR — view or download directly.
To the documents →

Important instructions

Avoid crosslinking inhibitors
Additive systems like MF-Ultra 70 are sensitive to sulfur, amine, tin, and phosphorus compounds—especially latex gloves, modeling clay, adhesive tapes, and some paints. If in doubt, make a small test cast before use.
Storage and shelf life
In its unopened original container, the product has a shelf life of at least 12 months when stored in a dry, cool place (10–25 °C). Consult the Safety Data Sheet (SDS) before opening.
Available packaging
0.5 kg + 5 kg, 2.5 kg + 25 kg. Other container sizes available on request.
compatibility
Compatible with polyurethane, epoxy, and polyester casting resins. Apply a release agent to protect the mold when using aggressive resins.

Recommended accessories

SILISIL Vaseline release paste white
Universal release agent for polyester, epoxy and polyurethane casts — protects the silicone mold from aggressive resins and extends the mold's lifespan.
View product →
SILISIL Delayer PA
Retarder for addition silicones — extends pot life and setting time for more complex multi-part structures and relaxed processing.
View product →
SILISIL Silicone Remover
Cleaning agent for silicone residues on tools, models and work surfaces — gentle and effective.
View product →

Which MF silicone for which application?

SILISIL RTV MF-Ultra 70 in direct comparison with related MF products in our range (MF = Mold & Form).

MF-Ultra 70
Current product 		MF-Ultra 60 →MF-Ultra 50 →MF-Dura 40 →
Shore hardness A67605040
Mixed viscosity230'000230'0005'0005'500
ColorBlueBlueOrangeBlue
Pot life @23 °C60601550
Topics & Application Areas
Key terms related to this product. Also useful for our search and filters.
Mold making SILISIL silicone RTV-2 Swiss bearing additive platinum prototyping Swiss brand 2K mold making Shore A 70

Technical data for SILISIL RTV MF-Ultra 70

All 16 product information 4 Physical properties 4 Electrical properties 1 Curing values ​​2 Product approvals 3 Mechanical properties 2
Product information
brand SILISIL
Mixing ratio 1:10
Networking type Addition (Platinum)
Container 1 kg + 100 g, 5 kg + 500 g
Physical properties
Paint has hardened Blue
Self-leveling Yes
Density (g/cm³) 0.97
Viscosity uncrosslinked (mPa·s) 600
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 60
Demolding time (min) 24
Product approvals
Food contact No
Suitable for medical use No
Certificates RoHS, REACH
Mechanical properties
Shore hardness A (cured) A 70
Elongation at break (%) 200

For binding values, please refer to the technical data sheet (TDS) in the "Documents" tab.

Documents and datasheets

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

Technical Data Sheets (TDS) 3
SILISIL RTV MF-Ultra 70 - Technical Data Sheet DE.pdf
127 KB
SILISIL RTV MF-Ultra 70 - Technical Data Sheet EN.pdf
127 KB
SILISIL RTV MF-Ultra 70 - Fiche Technique FR.pdf
127 KB

Frequently asked questions about SILISIL RTV MF-Ultra 70

Practical application and design questions — answered by SILITECH.

SILISIL RTV MF-Ultra 70 is a two-component (Shore A 67, blue) additive silicone for premium tooling in high-end industrial and related applications. Two-component industrial silicone, Shore A 67, blue — premium choice for the most demanding tooling

At 23 °C, the pot life is approximately 60 minutes and the demolding time approximately 24 hours. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.

As an addition system, SILISIL RTV MF-Ultra 70 is sensitive to crosslinking inhibitors: sulfur, amine, tin, and phosphorus compounds can locally halt vulcanization. Avoid latex gloves, sulfur-containing modeling clays, some adhesive tapes, and PVC plasticizers in the immediate vicinity of the mold. If in doubt, make a small test cast.

SILISIL RTV MF-Ultra 70 is mixed in a 1:10 ratio by weight (base to catalyst), with a maximum tolerance of ±5%. Homogenize both components separately before mixing, then thoroughly incorporate them – including the container walls and bottom. Brief vacuum degassing of the mixture is recommended for non-porous molds.

SILISIL RTV MF-Ultra 70 achieves a Shore A hardness of 67 (ASTM D 2240), a tensile strength of >7.0 N/mm² (ASTM D 412), an elongation at break of approximately 200% and a tensile strength of 7 N/mm (ASTM D 624).

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Product specifications

Product information
Container 1kg + 100g or 5kg + 500g
brand SILISIL
Mixing ratio 1:10
Networking type Addition (Platinum)
Physical properties
Paint has hardened Blue
Self-leveling Yes
Density (g/cm³) 0.97
Viscosity uncrosslinked (mPa·s) 600
Electrical properties
Electrical insulation Yes
Curing values
Potting time (min) 60
Demolding time (min) 24
Product approvals
Certificates RoHS or REACH
Food contact No
Suitable for medical use No
Mechanical properties
Shore hardness A (cured) A 70
Elongation at break (%) 200
Keywords
Keywords
Mold making SILISIL silicone RTV-2 Swiss bearing additive platinum prototyping Swiss brand 2K mold making Shore A 70

Documents and datasheets

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