Datasheet

LUXEON LED Assembly and Handling Application Brief AB32 20121217 38
Table 4. List of commonly used chemicals that will damage the silicone lens of a LUXEON LED.
Avoid using any of these chemicals in the housing that contains the LED package.
Chemical Name Normally used as
hydrochloric acid acid
sulfuric acid acid
nitric acid acid
acetic acid acid
sodium hydroxide alkali
potassium hydroxide alkali
ammonia alkali
MEK (Methyl Ethyl Ketone) solvent
MIBK (Methyl Isobutyl Ketone) solvent
Toluene solvent
Xylene solvent
Benzene solvent
Gasoline solvent
Mineral spirits solvent
dichloromethane solvent
tetracholorometane solvent
Castor oil oil
lard oil
linseed oil oil
petroleum oil
silicone oil oil
halogenated hydrocarbons (containing F, Cl, Br elements) misc
rosin flux solder flux
acrylic tape adhesive
The chemicals in Table 4 are typically not directly used in the final products that are built around LUXEON LEDs. However, some of these chemicals
may be used in intermediate manufacturing steps (e.g. cleaning agents). Consequently, trace amounts of these chemicals may remain on (sub)
components, such as PCBs. Philips Lumileds, therefore, recommends the following precautions when designing your application:
- When designing secondary lenses to be used over a single LED, provide a sufficiently large air-pocket and allow for “ventilation” of this air away
from the immediate vicinity of the LED.
- Use mechanical means of attaching lenses and circuit boards as much as possible. When using adhesives, potting compounds and coatings,
carefully analyze its material composition and do thorough testing of the entire fixture under High Temperature over Life (HTOL) conditions.