Diffuse reflectors: Arnite®
RFLX
Traditionally, white diffuse reflectors are made from polycarbonate. Leading manufacturers in the lighting industry approached DSM to find an alternative. Although special polycarbonate grades are available with improved discoloration performance, the current levels of discoloration, when combined with the very long lifetimes of LED solutions, are a key factor in unattractive appearances and light output drops of LED solutions.
Building on the intrinsically good resistance of polyesters against light/heat degradation and DSM’s knowledge on the physics of the degradation and discoloration of polymers, DSM developed Arnite RFLX. Flammability requirements remain tough for this application (V0 and 5VA at thin walls), and the initial reflectivity must be at least on par with the current commercially available solutions.
Recent test results revealed that Arnite RFLX significantly outperforms one of the best-available polycarbonates in light/heat degradation tests. Arnite RFLX has a UL94-V0 flammability at 0.75mm, superior to even the best polycarbonate alternatives. As a result, the thickness of the reflector can be minimized to save on material costs and improve injection molding cycle times.
Degradation of reflectivity (light heat aging 450nm, 120˚C)
0,5 0
-0,5 -1
-1,5 -2
-2,5 -3
-3,5 -4
-4,5 0 500 1000 test duration [hrs] Accelerated light/heat aging test results for Arnite RFLX
Terminal blocks: Stanyl ForTii Bright white colors are crucial for terminal blocks connecting to printed circuit boards (PCBs) that carry LEDs. Any variation or discoloration disturbs the aesthetics of the LED solution.
1500 2000
100 95 90 85 80 75 70
ForTii LX PPA9T PC
Material reflectivity before and aſter reflow simulations
n Dry as moulded n 8 hrs 160˚C n 8 hrs 160˚C + 4 min 260˚C
Arnite RFLX LED packaging: Stanyl ForTii LED LX
In early 2013, DSM introduced Stanyl ForTii LED LX. This high-flow material is a mineral-filled grade with UV resistance that sets a new standard for LED packages. Stanyl ForTii LED LX delivers reliable performance over time, with high initial reflectivity and excellent mechanical strength.
The combination of suitability for high-end connector applications, UL certification, and the bright white colour has led a number of key players in the industry to choose Stanyl ForTii T11 and F11C for their terminal block applications.
Stanyl ForTii is an innovative high-temperature polyamide 4T that delivers UL94-V0 flame retardency together with outstanding thermal and mechanical performance. This high-flow material is a mineral- filled grade with resistance to the near UV light and heat generated in the LED chip, that sets a new standard for LED packages.
PPA6T
Its high flow properties make it suitable for use in tools with over hundred cavities, and its excellent reflectivity has an immediate positive effect on the light output of the LED package, enabling LED suppliers to improve their key specifications.
Stanyl ForTii LED LX outperforms competitive PPAs due to its specific polymer structure. It delivers high reliability and LED lifetime via its excellent adhesion to silicone, epoxy encapsulates and the metallic lead frame, avoiding chip degradation due to moisture or air diffusion via interfacial delamination phenomena.
Weco “SMarTconn” terminal block
reflectivity drop [%]
R460 [%]
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