CHEMICaLs & ConForMaL CoatIngs
Below are representative lists of chemicals and materials to be used or avoided in LeD manufacturing activities. For a complete and
current list of recommended chemicals, conformal coatings and harmful chemicals consult Cree’s
Chemical Compatibility Application
. The video at
www.youtube.com/watch?v=t24bf9D_1SA
illustrates the process Cree has developed for testing the compatibility of
chemicals and materials with LeDs. You should also consult your regional Cree Field Applications engineer.
recommended Chemicals
In testing, Cree has found the following chemicals to be safe to use with XLamp ML family LeDs.
•
Water
•
Isopropyl alcohol (IPA)
Chemicals tested as Harmful
In general, subject to the specifics in Cree’s
Chemical Compatibility Application Note
, Cree has found certain chemicals to be harmful to
XLamp ML family LeDs. Cree recommends not using these chemicals anywhere in an LeD system containing XLamp ML family LeDs. The
fumes from even small amounts of the chemicals may damage the LeDs.
•
Chemicals that might outgas aromatic hydrocarbons (e.g., toluene, benzene, xylene)
•
Methyl acetate or ethyl acetate (i.e., nail polish remover)
•
Cyanoacrylates (i.e., “Superglue”)
•
Glycol ethers (including Radio Shack
®
Precision electronics Cleaner - dipropylene glycol monomethyl ether)
•
Formaldehyde or butadiene (including Ashland
®
PLIOBOND
®
adhesive)
Hermetically sealing Luminaires
For proper LeD operation and to avoid potential lumen depreciation and/or color shift, LeDs of all types must operate in an environment
that contains oxygen. Simply allowing the LEDs to ventilate to air is sufficient; no extraordinary measures are required. Hermetically
sealing LeDs in an enclosed space is not recommended.
potential of silver tarnishing
XLamp ML Family LeDs contain silver-plated parts that may tarnish (turn black) over time when exposed to oxidizing substances such as
sulfur, chlorine, or other halides. Oxidation of the leads can reduce the ability to make a good solder connection and affect the light output
of the LeD. exposure to oxidizing substances can come from materials used near the LeD during manufacturing or from the air around
the LeDs during storage.
To reduce the potential of tarnishing for XLamp ML Family LeDs, Cree recommends that customers minimize exposure of the LeDs
to oxidizing substances at all times, including storage, manufacturing and product testing. Potential sources of oxidizing substances
include paper, air filters, some cleaning chemicals, cardboard boxes and rubber anti-static mats.
99
Copyright © 2010-2018 Cree, Inc. All rights reserved. The information in this document is subject to change without notice. Cree
®
, the Cree logo and XLamp
®
are registered trademarks of Cree, Inc. Other
trademarks, product and company names are the property of their respective owners and do not imply specific product and/or vendor endorsement, sponsorship or association. This document is provided
for informational purposes only and is not a warranty or a specification. For product specifications, please see the data sheets available at www.cree.com. For warranty information, please contact Cree
Sales at [email protected].
9
XLamp
®
mL FamiLy LED SoLDEring & HanDLing
