DuPont Launches Duroptix™ OE-6370 M High-Clarity Addition-Cure Silicone Encapsulant to Enhance Next-Gen LED Lighting Rel

DuPont, a global leader in specialty materials, has highlighted its advanced encapsulation solution for the LED market — Duroptix™ OE-6370 M A/B Kit. This is a colorless, two-part, 1:1 mix ratio silicone elastomer specifically engineered to meet the rigorous challenges of the LED industry, including high-temperature reflow soldering, lead-free processing, and long-term thermal cycling environments.

As LED power densities continue to rise, encapsulants must not only possess high light transmittance but also maintain stable physical properties across a broad temperature range of -45°C to 200°C. According to DuPont’s technical data, Duroptix™ OE-6370 M exhibits 99.9%​ transparency at 450 nm (1 mm thickness) with a refractive index of 1.41, effectively reducing optical loss and enhancing light extraction efficiency. Based on polydimethylsiloxane, the material produces no cure by-products, eliminating the risk of corrosive gas erosion on chips and bonding wires often associated with traditional condensation-cure systems.

The product features moderate viscosity (mixed approx. 3308 cP) and a long pot life, making it compatible with industry-standard dispensing processes. It fully cures within 240 minutes at 150°C, achieving a Durometer Shore A hardness of 71, tensile strength of 9.2 MPa, and elongation of 80%. This allows it to absorb internal stresses during thermal cycling, protecting delicate components.

Duroptix™ OE-6370 M is primarily designed as an LED encapsulant, particularly suitable for dispensing processes​ in Surface Mount Device (SMD) and high-power LED packaging. As the electronics industry shifts toward lead-free processing, the material’s excellent thermal stability at reflow temperatures (typically peaking above 260°C) makes it an ideal choice for automotive lighting, outdoor displays, and industrial luminaires in high-humidity environments.

Furthermore, it demonstrates good unprimed adhesion​ to common LED substrates (e.g., Aluminum Al) with a die shear strength of 1008 psi (7.0 MPa). When combined with surface activation treatments such as plasma processing, adhesion can be further enhanced to meet long-term anti-vibration and weathering requirements.

Regarding purity, the product strictly controls metallic ion impurities (Na⁺ ≤ 0.1 ppm, K⁺ ≤ 0.2 ppm, Cl⁻ ≤ 0.5 ppm), reducing the risk of LED leakage current or failure caused by ion migration. It is important to note that as an addition-cure silicone, it may be inhibited by certain materials such as organotin compounds, sulfur and sulfur-containing materials, unsaturated hydrocarbon plasticizers, etc. DuPont recommends conducting a small-scale compatibility test when introducing new substrates or when solder flux residue status is uncertain.