3. Typical Properties
The table below presents representative typical properties for each product. For KE‑66, the “unmixed” state represents the base silicone prior to exposure to ambient moisture (RTV condition) and the “after curing” state represents the fully cured elastomer. For CAT‑RC, the properties are expressed as the effect it imparts when used in a standard formulation (typically compared as a cure performance modifier).
A. Shin‑Etsu KE‑66 RTV Silicone (1 KG)
| Property |
Unmixed (RTV State) |
After Curing (Fully Cured) |
| Viscosity |
~3,000 – 5,000 mPa·s |
– (Not applicable post-cure) |
| Tack-Free Time |
~10 – 15 minutes |
– |
| Cure Time |
– |
12 – 15 minutes (at ambient RH) |
| Hardness (Shore A) |
– |
60 – 65 |
| Tensile Strength |
– |
~2.5 – 3.0 MPa |
| Elongation at Break |
– |
150 – 200% |
| Density |
~1.50 g/cm³ |
~1.58 g/cm³ |
| Adhesion |
– |
Excellent on metals, glass, plastics |
B. Shin‑Etsu CAT‑RC
(Note: As a curing catalyst, CAT‑RC is used in combination with a silicone resin. The values below refer to its effect on a standard two-component RTV system.)
| Property |
Without Catalyst (Base System) |
With CAT‑RC Added |
| Cure Time |
~20 – 25 minutes |
Accelerated to ~12 – 15 minutes |
| Hardness (Shore A) |
55 – 60 (typical base cure) |
60 – 65 (enhanced cure consistency) |
| Tensile Strength |
~2.0 – 2.5 MPa |
~2.5 – 3.0 MPa |
| Elongation at Break |
140 – 170% |
150 – 200% |
| Overall Cure Uniformity |
Moderate |
Improved (more uniform network formation) |
Note: For CAT‑RC, the exact improvement depends on the formulation and mix ratio. The values provided are representative of its typical performance when used at the recommended dosage.