SILASTIC 3-8186
Harmonization Code : 3506.91.90.99 | Prepared glues and other prepared adhesives, not elsewhere specified or included; products suitable for use as glues or adhesives, put up for retail sale as glues or adhesives, not exceeding a net weight of 1 kg ; Adhesives based on polymers of headings 3901 to 3913 or on rubber; Other ; Other
Main features
- Low-Force Elastomeric Foam for Dispensed-in-Place Compression Gasketing
- Reduced-Flow Robotic Bead Dispensing
- 10-Minute 75 deg C Cure
Product Description
SILASTIC™ 3-8186 Thixotropic Foam is a two-part, platinum-cure liquid silicone foam for dispensed-in-place compression gaskets requiring low sealing force. Parts A and B are mixed at a 1:1 ratio by weight, then expand and cure into a medium-density elastomeric foam with moderate heat. Its thixotropic, reduced-flow behavior supports controlled bead placement using robotic or other automated dispensing equipment. The product is intended for sealing automotive components and lighting assemblies and may also be used for outdoor electrical enclosures.
Key features
- Low sealing force: Forms compressible foam gaskets for applications where lower compression force is required.
- Reduced-flow rheology: Supports controlled dispensing and uniform bead placement in automated gasketing processes.
- Low-temperature heat cure: Expands and cures in approximately 10 minutes at 75°C when properly mixed.
Applications / Suitable for
- Dispensed-in-place compression gaskets
- Automotive component sealing
- Lighting assembly sealing
- Outdoor electrical enclosure sealing
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Mechanical Properties
Additional Information
As-supplied / before-processing properties
Typical values for the separate components and the mixed material. These values are not intended for use in preparing specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Color | Part A: Black Part B: Off-white |
— | CTM 0063; as supplied |
| Specific gravity | Part A: 1.12 Part B: 1.22 |
— | CTM 0044; as supplied |
| Viscosity | Part A: 135,000 Part B: 125,000 |
cP | CTM 0050; as supplied |
| Mix ratio | 1:1 | By weight | Part A to Part B |
| Mixed color | Black | — | CTM 0063; 1:1 mix ratio by weight |
| Snap time | 3.5 | min | CTM 0092A; 1:1 mix ratio by weight |
| Flow, maximum | 4 | in | CTM 0062; 1:1 mix ratio by weight |
| Working time | Approximately 1 | min | At 23°C and 50% relative humidity; higher temperatures reduce working time |
After-processing / final-state properties
Typical physical properties after curing for 10 minutes at 75°C and equilibrating for 24 hours at 23°C and 50% relative humidity. These values are not intended for use in preparing specifications.
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Foam density | 225 (14) | kg/m³ (pcf) | CTM 0854A |
| Tensile strength | 0.18 (26) | MPa (psi) | ASTM D412, Die A |
| Elongation | 140 | % | ASTM D412 |
| Compression deflection, 25% ILD | 0.032 (4.7) | MPa (psi) | CTM 0525 at 23°C |
| Compression deflection, 50% ILD | 0.085 (12.4) | MPa (psi) | CTM 0525 at 23°C |
| Compression deflection, 75% ILD | 0.33 (48.6) | MPa (psi) | CTM 0525 at 23°C |
| Compression set | 3 | % | CTM 0085; 72 hours at 23°C and 50% deflection |
