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  1. All Products
  2. SILISIL RTV MF-Dura 35 Fast
SILISIL RTV MF-Dura 35 Fast

SILISIL RTV MF-Dura 35 Fast

https://www.silitech.ch/web/image/product.template/3550/image_1920?unique=1386b85

Castable, addition-curing RTV-2 silicone rubber, green; mixing ratio 1:1 by weight (tolerance max. ±5%); for mold and model making and art ceramics;
Shore A approx. 35; viscosity 7,500 mPa·s; demolding time approx. 6 min at 23 °C

2K addition silicone Shore A 35 (green, mixing ratio 1:1) — 2K rapid system Shore A 35 with pot life 1 min and curing in 20 min.

Price on request

  • Brand
  • Mixing Ratio
  • Curing type
  • Cured Color
  • Self-leveling
  • Density (g/cm³)
  • Uncrosslinked viscosity (mPa·s)
  • Electrical Insulation
  • Pot life (min)
  • Demolding time (min)
  • Full cure (h)
  • Food contact
  • Medical grade
  • 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 Moulding / Mold making Fast Shore A 35

 
General Terms and Conditions

Shipping usually within 1 to 3 business days
(Availability confirmed after order)

Express logistics. Fast and reliable within Switzerland & Europe

From Swiss stock Dispatch within 24h Batch certificate Invoice 30 days (B2B) Technical advice
Shipping & Delivery

Usually 1 to 3 business days

Availability is confirmed after order receipt.

Express logistics within Switzerland & Europe.

Terms and Conditions →

Product data

HS Code: 3910.0000

HS Code: 3910.0000

SILISIL RTV MF-Dura 35 Fast
SILISIL RTV MF-Dura 35 Fast
SILISIL ·

SILISIL RTV MF-Dura 35 Fast is a room temperature vulcanizing 2-component addition silicone (platinum crosslinking, RTV-2) of the MF-Mold & Form series — 2K rapid system Shore A 35 with a pot life of 1 min and curing in 20 min.

The mixture is prepared in a 1:1 ratio by weight (tolerance ±5%). Pot life at 23°C is approximately 1 minute, demolding after approximately 6 minutes, and complete curing after 24 hours. Temperature resistant from -40°C to +200°C.

Key property

Ultra-fast vulcanization — pot life only 1 minute, demolding after 6 minutes, fully cured after 20 minutes. Ideal for prototypes and urgent reproductions.

SILISIL RTV MF-Dura 35 Almost in Numbers
A 35
Shore Hardness
7'500
mPa·s viscosity
1 min
Pot life @23 °C
300 %
Elongation at break

What distinguishes SILISIL RTV MF-Dura 35 Fast

Pot life only 1 minute
Very short processing time — suitable for high-throughput production with short mold cycles.
Fully vulcanized in 20 minutes
Faster curing cycle for high-throughput applications — more forming cycles per day.
Very high tensile strength >7 N/mm²
High tear strength — robust against mechanical stress during demolding.
Fastest MF-Dura type
Shortest curing kinetics in the series — maximum throughput for urgent orders.
Mixing ratio 1:1 by weight
Simple 1:1 ratio — hand-mixable without a precision scale, ideal for workshops and hobbyists.
Temperature resistance −40 to +200 °C
Extended application range for hot wax applications and mold storage in extreme climates.

What is SILISIL RTV MF-Dura 35 Fast used for?

Rapid impression taking in daily production cycles
Pot life 1 minute, fully vulcanized in 20 minutes — multiple mold cycles per hour for high-throughput production.
Workshop and training applications
During a 1-hour workshop, participants can create a mold, make a cast, and demold — ideal for educational institutions and maker spaces.
Repairs and model corrections
The fastest way to mold, cast and glue damaged areas on models — no waiting times of several days.
Iterative prototype development
Going through several design variations per day — the 20-minute curing drastically accelerates the iteration cycle.
Urgent small orders
Very high tensile strength >7 N/mm² despite rapid cure — the mold is ready for production immediately after 20 minutes.
Demo applications and trade shows
On-site demonstrations with the finished mold within minutes — visual proof of the processing properties for customers.

Processing

1
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.
2
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.
3
Vacuum degassing
For pore-free molds, briefly degas the mixture under vacuum — entrapped air bubbles are removed, ensuring a smooth mold surface.
4
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.
5
Vulcanize and demold
At 23 °C, demolding is possible after approximately 6 minutes; complete curing takes 24 hours. A 24-hour "maturation phase" is required before the first casting to ensure 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
Additive systems like MF-Dura 35 Fast 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
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. 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-Dura 35 Almost in direct comparison with related MF products in our range (MF = Mold & Form).

MF-Dura 35 Fast
Current Product 		MF-Dura 35 →MF-Dura 30 →MF-Dura 32 →
Shore hardness A3533?32
Mixed viscosity7'5007'500?6'000
ColorGreenTranslucent?Brown Red
Pot life @23 °C120?10
Topics & Application Fields
Key terms related to this product. Also useful for our search and filters.
Mold making SILISIL silicone RTV-2 Swiss bearing Addition Platinum Prototyping Swiss brand 2K Moulding / Mold making Fast Shore A 35 Assortment Review 2026 Price list missing

Technical data for SILISIL RTV MF-Dura 35 Fast

All 17 Product Information 4 Physical Properties 4 Electrical Properties 1 Curing Values 3 Product Approvals 3 Mechanical Properties 2
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 Green
Self-leveling Yes
Density (g/cm³) 1.16
Uncrosslinked viscosity (mPa·s) 7500
Electrical Properties
Electrical Insulation Yes
Curing values
Pot life (min) 1
Demolding time (min) 6
Full cure (h) 20
Product Approvals
Food contact No
Medical grade No
Certificates RoHS, REACH
Mechanical properties
Shore hardness A (cured) A 35
Elongation at break (%) 300

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-Dura 35 Fast - Technical Data Sheet DE.pdf
125 KB
SILISIL RTV MF-Dura 35 Fast - Technical Data Sheet EN.pdf
125 KB
SILISIL RTV MF-Dura 35 Fast - Fiche Technique FR.pdf
125 KB
Safety Data Sheets (SDS) 3
SILISIL RTV MF-Dura 35 Fast - Safety Data Sheet DE.pdf
363 KB
SILISIL RTV MF-Dura 35 Fast - Safety Data Sheet EN.pdf
385 KB
SILISIL RTV MF-Dura 35 Fast - Fiche de Sécurité FR.pdf
390 KB

Frequently asked questions about SILISIL RTV MF-Dura 35 Fast

Practical application and design questions — answered by SILITECH.

SILISIL RTV MF-Dura 35 Fast is a two-component (Shore A 35, green) additive silicone for rapid impression taking in daily production cycles and related applications. This two-component fast-curing system has a pot life of 1 minute and a curing time of 20 minutes

At 23 °C, the pot life is approximately 1 minute and the demolding time approximately 6 minutes. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.

As an addition system, SILISIL RTV MF-Dura 35 Fast 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-Dura 35 Fast is mixed in a 1:1 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-Dura 35 Fast achieves a Shore A hardness of 35 (ASTM D 2240), a tensile strength of >7 N/mm² (ASTM D 412), an elongation at break of approximately 300% and a tensile strength of 9 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 Green
Self-leveling Yes
Density (g/cm³) 1.16
Uncrosslinked viscosity (mPa·s) 7500
Electrical Properties
Electrical Insulation Yes
Curing values
Pot life (min) 1
Demolding time (min) 6
Full cure (h) 20
Product Approvals
Certificates RoHS or REACH
Food contact No
Medical grade No
Mechanical properties
Shore hardness A (cured) A 35
Elongation at break (%) 300
Keywords
Keywords
Mold making SILISIL silicone RTV-2 Swiss bearing additive Platinum prototyping Swiss brand 2K Moulding / Mold making Fast Shore A 35

Documents and data sheets

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