Flame-Retardant Silicone Potting for Electronic and Electrical Assemblies

STEP-KS2 is a flame-retardant modification of the STEP-KS1 silicone compound. This two-component, room-temperature-curing material is intended for potting and sealing electronic and electromechanical assemblies that require environmental protection and a flame-retardant material.

The low-viscosity mixture flows into small gaps and follows the geometry of the assembly. It cures with minimal shrinkage. The cured material can be mechanically removed where access for repair or maintenance is needed.

Key Benefits

Flame-retardant formulation; the source specification reports UL 94 V-0 classification.
Low viscosity for filling narrow gaps.
Room-temperature curing, with an accelerated elevated-temperature option.
Minimal curing shrinkage.
Mechanically removable for repairable assemblies.
Operating temperature range stated in the product description: -60°C to +250°C; technical table lists -60°C to +200°C. Confirm the applicable limit with the manufacturer before use.

Typical Applications

Potting of microchips and electronic components.
Sealing coils and electrical connectors.
Protection of electronic, instrumentation and electromechanical assemblies.
Repairable electronic devices where flame-retardant potting is required.

Technical Specifications

Material	Two-component silicone
Mixed appearance	Low-viscosity liquid, white to light beige
Mixing ratio	100:2
Working time	At least 20 min at 20 ± 2°C
Brookfield dynamic viscosity	8,000–10,000 mPa·s at 23°C
Density	1.35 ± 0.05 g/cm³
Technological cure	12–16 h at 20–35°C
Cold cure schedule	24 h at 15–35°C
Tensile strength	0.25–0.30 MPa
Elongation at break	40–50%
Relative permittivity at 1 MHz	2.7–3.2
Hardness	45–50 Shore A
Flammability classification	UL 94 V-0 (as stated by source)
Operating temperature in technical table	-60°C to +200°C

Important technical clarification: The source page gives two different upper operating-temperature limits (+250°C in the feature list and +200°C in the technical table). The CSV preserves this discrepancy transparently; please confirm the correct value with the manufacturer before publishing a definitive claim. Verify the UL 94 classification and applicable test documentation before making compliance claims in target markets.

UL 94 V-0 silicone

STEP-KS2 Flame-Retardant Silicone Potting Compound