Thermal silicone adhesive

RTV (Room-Temperature-Vulcanising) silicone is a single-part adhesive that cures by absorbing moisture from ambient air. Apply a bead, mate the parts, and surface tack-free time is typically 5 – 30 minutes; full cure-through reaches 2 – 4 mm/24 h depending on humidity and temperature. No mixing, no oven, no induction-heating step — ideal for assemblies that can't tolerate a thermal cure or where production-line space rules out a bake oven.

Pick TIS580 RTV silicone when the joint must absorb thermal-cycling fatigue, vibration, or wide service-temp swings (−50 to +200 °C). The post-cure modulus is low (Shore A 25 – 60), so the bond yields gracefully under CTE mismatch. Pick TIE380 thermal epoxy when you need maximum lap-shear strength (8 – 20 MPa vs 1 – 3 MPa for RTV silicone), rigid mechanical reinforcement, or top-class moisture barrier. Epoxy is structural; silicone is sealing-plus-thermal.

Yes — TIS580 grades are electrically insulating with volume resistivity ≥ 10¹⁴ Ω·cm and dielectric strength of 10 – 21 kV/mm depending on grade. The ceramic / metal-oxide thermal filler is non-percolating, so even thin bondlines maintain dielectric isolation. Verify the per-grade datasheet if your application operates above 1 kV continuous; some grades derate at very thin bondlines.

Single-part RTV silicone cures inward from the surface as moisture diffuses through the bondline. Thin bondlines (50 – 250 µm) cure within hours; thick bondlines slow proportionally — a 5 mm bead can take a week to fully cure through. For permanent service this is fine, but for production-line throughput keep the joint ≤ 1 mm. If a thick fill is needed, use a two-part silicone potting compound (TIS680 / TIG680) instead.

Conventional RTV silicones release acetic acid or alcohol during cure, which can corrode metal contacts or condense on optics. TIS580 grades are formulated as low-acid, low-VOC chemistries — outgassing is minimised but not eliminated. For ultra-clean applications (CCD packaging, hermetic relays, MEMS) confirm the per-grade outgassing data and consider switching to a cure-by-addition silicone or fully-encapsulated potting where outgas pathways are sealed.

TIA tape is a dry, double-sided pressure-sensitive adhesive — peel and place, instant placement, reworkable. TIS580 is a wet dispensable adhesive — conforms to non-flat surfaces, thicker bondline support, and stronger long-term bond strength. Pick tape for fast assembly with reworkability; pick TIS580 RTV silicone when the geometry is non-flat, the gap is variable, or the bond must survive higher temperatures and longer service life.