Silicones, silicone oils, sprays
Casting and potting resins)
SILISIL RTV MF-Dura 40
Pourable, addition-curing RTV-2 silicone rubber, blue; mixing ratio 1:1 by weight (tolerance max. ±5%); for molds for jewelry, artificial stone and concrete;
Shore A approx. 40; viscosity 5,500 mPa·s; pot life approx. 50 min
2K addition silicone Shore A 40 (blue, mixing ratio 1:1) — higher hardness for durable industrial molds.
Documents
HS Code:
3910.0000
SILISIL RTV MF-Dura 40 is a room temperature vulcanizing 2-component addition silicone (platinum crosslinking, RTV-2) of the MF-Mold & Form series — 2K addition silicone Shore A 40 — higher hardness for heavy-duty industrial molds.
The mixture is prepared in a 1:1 ratio by weight (tolerance ±5%). Pot life at 23°C is approximately 50 minutes, demolding is possible after approximately 4 hours, and complete curing takes 24 hours. Temperature resistant from -40°C to +200°C.
Higher final hardness (Shore A 40) — the right choice for robust industrial molds that must withstand mechanical stress without deformation.
What distinguishes SILISIL RTV MF-Dura 40
What is SILISIL RTV MF-Dura 40 used for?
Processing
Important Notes
Recommended accessories
Which MF silicone for which application?
SILISIL RTV MF-Dura 40 in direct comparison with related MF products in our range (MF = Mold & Form).
|
MF-Dura 40
Current Product
|
MF-Dura 30 → | MF-Dura 32 → | MF-Dura 35 → | |
|---|---|---|---|---|
| Shore hardness A | 40 | ? | 32 | 33 |
| Mixed viscosity | 5'500 | ? | 6'000 | 7'500 |
| Color | Blue | ? | Brown Red | Translucent |
| Pot life @23 °C | 50 | ? | 10 | 20 |
Technical data for SILISIL RTV MF-Dura 40
| 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) | 1.12 |
| Uncrosslinked viscosity (mPa·s) | 5500 |
| Electrical Properties | |
|---|---|
| Electrical Insulation | Yes |
| Curing values | |
|---|---|
| Pot life (min) | 50 |
| Demolding time (min) | 4 |
| Full cure (h) | 24 |
| Product Approvals | |
|---|---|
| Food contact | No |
| Medical grade | No |
| Certificates | RoHS, REACH |
| Mechanical properties | |
|---|---|
| Shore hardness A (cured) | A 40 |
| Elongation at break (%) | 250 |
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
Frequently asked questions about SILISIL RTV MF-Dura 40
Practical application and design questions — answered by SILITECH.
SILISIL RTV MF-Dura 40 is a two-component (Shore A 40, blue) addition silicone for industrial tool molds and related applications. Two-component addition silicone Shore A 40 — higher hardness for durable industrial molds
At 23 °C, the pot life is approximately 50 minutes and the demolding time approximately 4 hours. Complete curing is achieved after 24 hours. Lower temperatures extend, higher temperatures shorten these times.
As an addition system, SILISIL RTV MF-Dura 40 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 40 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 40 achieves a Shore A hardness of 40 (ASTM D 2240), a tensile strength of >4.0 N/mm² (ASTM D 412), an elongation at break of approximately 250% and a tensile strength of 15 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) | 1.12 |
| Uncrosslinked viscosity (mPa·s) | 5500 |
| Electrical Properties | |
|---|---|
| Electrical Insulation | Yes |
| Curing values | |
|---|---|
| Pot life (min) | 50 |
| Demolding time (min) | 4 |
| Full cure (h) | 24 |
| Product Approvals | |
|---|---|
| Certificates | RoHS or REACH |
| Food contact | No |
| Medical grade | No |
| Mechanical properties | |
|---|---|
| Shore hardness A (cured) | A 40 |
| Elongation at break (%) | 250 |
| Keywords | |
|---|---|
| Keywords | |
Documents and data sheets
Safety Data Sheets (SDS) and Technical Data Sheets (TDS) for download:
- SILISIL RTV MF-Dura 40 - Fiche Technique FR.pdf (123 KB)
- SILISIL RTV MF-Dura 40 - Fiche de Sécurité FR.pdf (386 KB)
- SILISIL RTV MF-Dura 40 - Safety Data Sheet EN.pdf (381 KB)
- SILISIL RTV MF-Dura 40 - Safety Data Sheet DE.pdf (360 KB)
- SILISIL RTV MF-Dura 40 - Technical Data Sheet EN.pdf (123 KB)
- SILISIL RTV MF-Dura 40 - Technical Data Sheet DE.pdf (124 KB)