SantoLight™ Optical Fluids SL-5267

Product Data Sheet

SL-5267 Optical Fluid for Photonics and Optics

High refractive index: 1.67
Optically clear: Blue-green to near IR
Radiation hard, low viscosity, non toxic
Low volatility

SL-5267 is a chemically inert optical grade fluid designed especially for sensitive optical assemblies. SL-5267 offers a service temperature range of -40°C (-40°F) to + 150°C (+302°F).

Applications:

Wafer level optical metrology
Index matching to polyimide waveguides
Coolant/optical fluid for high power laser optics
Non-toxic, high index microscope immersion fluid
Radiation-resistant optical fluid for medical and nuclear applications
Optical coupling between flat panel display elements
Gap coupling between prisms and grating
Thermally compensated fluid lenses
Projection display components
Solar cell efficiency enhancer

Property (at 25°C unless noted)	Test Method	Typical Value
Mechanical properties...................
Viscosity	ASTM D-1084	100cP
Surface tension	plate method	50dyne/cm
Specific gravity	ASTM D-1217	1.20
Bulk modulus	t.b.d.	30,000 kg/cm²
Thermal properties ......................
Glass transition temperature	TMA/DSC	-40°C (-40°F) estimated
Pour point	ASTM-D097	-25°C
Thermal expansion by volume	ASTM-D1903	6.3x10^-4 cc/cc/°C
Thermal conductivity	ASTM-C177	0.13 watt/(meter-°K)
Evaporation rate (24 hours, 100°C)	ASTM-D972	0.1% estimated
TGA Take-off, 1% mass loss	TGA	200°C,estimated
Electro-optical properties ................
Appearance	Visual	Crystal clear, straw tint
Ionics (K, Na,P Ag, Sn)	ICP	< 10ppm each estimated
Volume resistivity	ASTM D-257	> 10¹⁵ ohm-cm, estimated
Refractive index, 589 nm	ASTM D-1218	1.67
Refractive index vs. Temp. 589 nm	ASTM D-1218	-4.9 x 10^-4/°C
Refractive index vs. wavelength	prism coupler	(chart)
Optical absorption	spectrophotometer	(chart)
Particle contamination	MIL-STD-1246C	Level 25, estimated

Benefits of SantoLight SL-5267:
1.67 refractive index:	Allows index matching to high index plastics, glasses, semiconductors
Low viscosity fluid:	Allows rapid dispensing into large assemblies
Chemically inert:	Non-toxic, compatible with optical grade materials
Optically clear:	Efficient optical transmission for wavelengths > 430 nm
High surface tension:	Non-migrating in thin film
Low volatility:	Eliminates recondensation contamination, ensures long service life
High purity composition	low ionics ensure no degradation of sensitive semiconductors, metals
Wide temperature service	suitable for outdoor environments

Application Notes:

Index matching using Lightspan Optical Polymers

Deaeration:
If air bubbles become trapped in the dispensed fluid volume during the dispensing process, the assembly should self-deaerate due to the product's long room temperature pot life and low viscosity as long as o pockets of air are trapped beneath mechanical parts. If accelerated deaeration is required using a pressure of 635 mm Hg (25 in Hg) or greater. Apply the vacuum while observing the uncured fluid to presence of bubble formation and increase vacuum slowly enough to avoid rapid foaming. Hold vacuum until bubbles at the fluid surface collapse and are no longer visible.

Optical Material Compatibility:
SL-5267 is inert and compatible with most optical glasses and semiconductors. Substrates to avoid include: ester vulnerable plastics such as polystyrene and ABS. Some seal materials such a butyl rubber will show swelling when in contact with SL-5267 for extended periods at temperatures in excess of 100°C. As a rule, SL-5267 will not be miscible with other fluids including other SantoLight or Lightspan Optical Fluids.

Substrate Preparation:
Substrates should be free of dust, oil, and fingerprint soils. Clean substrates using suitable industrial techniques for cleaning electro-optics. If hydrocarbon solvent cleaning (e.g. acetone) is used, a final rinse with reagent grade isopropanol is recommended. If aqueous detergent cleaning is used, multiple final rinses with de-ionized water or a single rinse with reagent grade isopropanol is recommended. Always use suitable lint-free wipers when cleaning sensitive optical substrates, lenses, cover glasses, coatings, and other optical materials.

Clean-up:
SL-5267 may be removed from surfaces by first wiping off excess fluid with a suitable dry lint-free wiper and then by wiping down the surface with a lint-free wiper soaked with acetone. If the surface material is incompatible with acetone (it can soften or crack some plastics), use isopropanol. If acetone residues are undesirable, the clean up process should be completed with a final rinse with reagent grade isopropanol. The user is responsible for compliance with all applicable regulations government disposal of waste materials as indicated in the MSDS.

Packaging:
For prototyping and small batch sizes in production, we recommend:

30 cc (1 fl. oz.) bottle with graduated pipette applicator

480 cc (16 fl. oz.) bottle

Other container sizes are available for use with automated dispensing equipment. Tell us your requirements and let us propose for you an acceptable solution.

Specifications:
The typical properties quoted on this product data sheet should not be used as a basis for preparation of product specifications.

Shelf life:
SL-5267 is an inert fluid with no intrinsic shelf life limitations. It will, however, suffer changes in properties if removed from its original container and subjected to extreme environmental conditions, as indicated in the typical properties table which tend to cause volatilization or thermooxidative breakdown, or alternatively, through contamination with particles of dust, dirt or other solids or fluids.

Warranty:
SL-5267 is sold without warranty, express or implied. SantoLight and SPI Supplies disclaim any liability for incidental or consequential damages resulting from the use of this product. The user is counseled to conduct thorough design and qualification and testing studies prior to approval of SL-5267 for any production process or product component.

Safety:
Consult the Materials Safety Data Sheet (MSDS) for SL-5267 before use. SL-5267 is an industrial product, designed for use only by qualified laboratory or production personnel.

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Contacting SPI Supplies and Structure Probe, Inc.
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