AB209 LUXEON 3020 Application Brief 20170307 ©2017 Lumileds Holding B.V. All rights reserved.

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Table 4 provides a list of commonly used chemicals that should be avoided as they may react with the silicone material.

Note that Lumileds does not warrant that this list is exhaustive since it is impossible to determine all chemicals that may

affect LED performance.

The chemicals in Table 4 are typically not directly used in the final products that are built around LUXEON emitters.

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 heat sinks. Lumileds, therefore, recommends

the following precautions when designing your application:

– When designing secondary lenses to be used over an 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.

Table 4. List of commonly used chemicals that will damage the silicone of the LUXEON emitter. 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

RoHS

COMPLIANT

No. E352519