Silicone type Description Mixing ratio Processing time Demouldable Heat resistance Hardness Shore A Colourable with
R&G Universal colour pastes
KDSV-10 Casting compound, white
condensation-curing
100 : 2 to 100 : 3 30 - 50 minutes
(at 25 °C)
4 - 5 hours
(at 25 °C)
short-time up to
max. 200 °C
10±2 yes
KDSV-25 Casting compound, white
condensation-curing
100 : 2 to 100 : 3 30 - 40 minutes
(at 23 °C)
3 - 5 hours
(at 25 °C)
short-time up to
max. 200 °C
25±2 yes
KDSV M 4470

Casting compound, red-brown
condensation-curing

Suitable for casting
of low-melting metal
alloys (e.g. lead and tin)

100 : 2 to 100 : 3

20 - 40 minutes
(at 25 °C)

2 - 4 hours
depending on curing agent quantity
Continuous temperature resistance
200 °C
short-time up to
max. 300 °C
60 yes

ADDV-10 TRANSLUCENT

(suitable for mold making)

Casting compound, translucent
addition-curing
100 : 100 (= 1 : 1)

30 - 40 minutes
(at 25 °C)

4 - 5 hours
(at 25 °C)
Continuous temperature resistance
200 °C
10±2 no
ADDV-10 CRYSTAL CLEAR

(not for mold making*)

Casting compound, crystal clear
addition-curing
100 : 100 (= 1 : 1)

30 - 60 minutes
(at 25 °C)

4 - 6 hours
(at 25 °C)
short-time up to
max. 200 °C
10±2 no
ADDV-25 BLAU Casting compound, blue
addition-curing
100 : 100 (= 1 : 1) 30 - 50 minutes
(at 25 °C)
4 - 5 hours
(at 25 °C)
short-time up to
max. 250 °C
25±2 no
ADDV-42 RED

Casting compound, red
addition-curing

Suitable for casting
of low-melting metal
alloys (e.g. lead and tin)

100 : 100 (= 1 : 1) 30 - 50 minutes
(at 25 °C)
4 - 5 hours
(at 25 °C)
short-time up to
max. 250 °C
40±2 no
ADDV M 4641

Casting compound, translucent
addition-curing

FDA and BfR compliant, suitable for food

100 : 10 (= 10 : 1) 90 minutes
(at 23 °C)
15 hours
(at 23 °C)
(30 min. at 70 °C)
Continuous temperature resistance
180 °C
43 no
ADDV-612 CLEARSOFT Casting compound, colourless, transparent
addition-curing
200 : 100 (= 2 : 1) 150 minutes
(at 23 °C)

8 hours
(at 23 °C)

- 10±3 no


 *) Not intended for mold making. Due to its low tensile strength, the ADDV-10 GLASKLAR system is only suitable for electro casting and similar applications.

Shore A Hardness


Shore 0-20

Very soft silicones with very high flexibility. Suitable for moulds with pronounced undercuts.

Shore 20-40
Medium-hard silicones. The most common materials for impressions with undercuts and good dimensional stability.

Shore 40-80
Hard silicones. For self-supporting moulds, vacuum casting resins, and rapid prototyping.

Shore A Hardness scale - comparison table

R&G Faserverbundwerkstoffe Silikone

Highly flexible moulds made of silicone rubber
allow the reproduction of complicated moulded parts with undercuts. The main areas of application are, for example, the production of model parts, furniture ornaments, relief images, decorative candles, architectural models, decorative buttons, doll bodies, sealing profiles as well as reproductions in monument conservation.

Master models made of the usual materials such as wood, metal, plastic, plaster, stone, and wax are well suited for impressions with silicone rubber. All silicones are self-releasing, no release agent is required. More information on the product.


We distinguish two curing systems:

RTV-2 silicones condensation curing (e.g. R&G silicones KDSV-25, KDSV-10, KDSV THX-30, and KDSV M 4470)

Mould making

In condensation curing, the B component is added to the A component in a proportion of between 2 % and 5 %. During curing, a volatile alcohol compound is formed as a decomposition product, which leads to slight volume shrinkage.

Acceleration of the curing by increasing the temperature is not recommended. The vulcanizate may only be thermally loaded after complete volatilization of the cleavage product.

Advantages

  • No vulcanization disturbance due to inhibition.
  • The vulcanization speed can be adjusted within certain limits by varying the curing agent quantities or selecting a slow or fast curing agent.
  • Excellent reproduction accuracy and excellent release properties.

Colouration is possible with R&G universal color pastes.
Can be used for short periods up to max. 200 °C, KDSV M 4470 even up to 300 °C

RTV-2 silicones addition curing (e.g. R&G Silicones ADDV-10, ADDV-25, ADDV-42, ADDV M 4641 and ADDV-612 CLEARSOFT)

Mould making

The most important feature of addition crosslinking is a platinum-containing catalyst complex. This controls - depending on the product in the A or B component - vulcanization without the release of a fission product and thus without shrinkage. The crosslinking rate can be extremely accelerated after processing by adding heat.

  • Acceleration of the reaction by increasing the temperature
  • Irreversible crosslinking
  • No weight loss during curing
  • Very low shrinkage rate (< 0.1 %)
  • No release of fission products
  • Excellent reproduction accuracy and excellent release properties

Detailed selection aids for all silicones can be found in the R&G eWiki

Brochure with processing instructions here

The following YouTube films show how the processing works: