Cargille Labs

Services to the sciences since 1924

Refractive Index (Matching) Liquids

Also see our Specialized Optical Coupling Liquids

Cargille Refractive Index Liquids have become standard items in many laboratories as their applications have expanded from routine mineralogical identifications and quality control. New and broader uses in many more fields such as chemicals, engineering, medical, forensic, optics, and instrumentation are continuously discovered. Many special requirements for specific applications have created a need for more technical data, new formulations, extended ranges, smaller increments and higher degrees of precision.

Since 1942, Cargille Laboratories, Inc. has been filling this growing need. And today, the largest and most comprehensive assemblage of refractive index liquids - over 250 stocked items - are available for science, industry, medicine, and education. For specialized and unusual applications, many more can be formulated and others are routinely researched in anticipation of new needs.

Chlorofluorocarbon (CFC) components used in some Cargille optical liquids have physical properties that are harmless to the ozone layer, unlike those found in refrigerant gases, propellants, and solvents, which are destructive. The components used by Cargille Laboratories have vapor densities ten times that of air, are relatively nonvolatile, and have boiling points at least 100°C higher than the highest-boiling CFC of those listed for removal from commercial use by the Montreal Protocol.

Applications

Cargille Refractive Index Liquids have a broad range of applications in diversified fields. The following table briefly illustrates some of the typical areas of use.

AREA OF INTEREST
TYPICAL APPLICATIONS
IDENTIFICATION.................. Identify minerals, ores, chemicals, specimen fragments, plastics, gems, translucent or transparent solids by microscopic immersion techniques.
MOUNTING MEDIA.............. Temporarily mount specimens in various index media for matching or contrasting index combinations.
Mount specimens and thin sections in a stable, viscous, nondrying index of refraction liquid to permit sample rotation by shifting cover glass for more comprehensive examination. (Cargille MeltMount)
OPTICAL ANALYSIS............ Microscopically study solids by dispersion staining, focal masking, and double variation refractometry techniques with high dispersion liquids.
REFRACTOMETRY.............. Calibrate refractometers and other optical instruments.
EDUCATION........................ Instruct and exhibit principles and applications of refraction.
SPECTROPHOTOMETRY..... Determine refractive index of specimens by referral to calibration curves relating wave length to index of refraction.
STRAIN ANALYSIS.............. Examine stress and strain effects of transparent or translucent items; molded, formed, curved or intrinsically shaped parts by polariscopic immersion technique. (Cargille Immersion Liquids)
TOXEMIA............................. Identify salts precipitated from body fluids and measure relative amounts of sodium and potassium chloride for indicating toxemia.
OPTICAL COUPLING........... Couple optical elements with liquids formulated for refractive index and viscosity.
OPTICAL LENSES............... Obtain unique optical properties of hollow lenses by filling with index of refraction liquids.
ELECTRO-OPTICS............... Examine and preserve cathode coating without stripping or re-immersion by utilizing oils matching index of crystals.
POLLUTION......................... Identify particles and particulates from air or water.
FLUID FLOW....................... Photograph flow patterns by filling test system with refractive index liquids having suspended "beads".

Price Schedule

All Refractive Index Values are standardized at 5893 angstroms and 25°C.
For Custom Made Liquids please complete our Optical Liquids Worksheet
All of the Refractive Index Liquid Sets are sold in 7.4cc bottles (1/4 fl oz)

COMBINED SETS: nD 1.400-1.700

The range of many minerals, most chemicals, and virtually all biological materials are covered by the three Certified Series AA, A and B. These three Series are available as complete sets:

Cat. #   Price
18001 RF-1..........Full Set;  Intervals 0.002;  151 liquids $2,793.00
18002 RF-1/2.......Half Set;  Intervals 0.004;  76 liquids 1,533.25
18005 RF-1/5.......Fifth Set;  Intervals 0.01;  31 liquids 620.25
Individual Series, fractions of Series, or selected liquids in the Standard Group may also be purchased separately.

Cat. # SERIES AAA: Range nD 1.300-1.395, Adjustment ±0.0002 Price
Slightly volatile, colorless fluorocarbon formulation. Keep tightly stoppered.
18031 AAA-1.......Intervals 0.005;  20 liquids $494.00
18032 AAA-1/2....Intervals 0.01;  10 liquids 267.75
1803X AAA-x.......Any liquid selected, standard 1/4 fl. oz. (7cc) 39.50
1803Y AAA-xx.....Any liquid selected, 1 fl. oz. (30 cc) 117.00

Cat. # SERIES AA: Certified, Range nD 1.400-1.458, Adjustment ±0.0002 Price
Very stable, colorless.
18061 AA-1.........Full Set;  Intervals 0.002;  30 liquids $471.25
18062 AA-1/2......Half Set;  Intervals 0.004;  15 liquids 257.00
18065 AA-1/5......Fifth Set;  Intervals 0.01;  6 liquids 106.75
1806X AA-x.........Any liquid selected, standard 1/4 fl. oz. (7 cc) 25.50
1806Y AA-xx.......Any liquid selected, 1 fl. oz. (30 cc) 74.50

Cat. # SERIES A: Certified, Range nD 1.460-1.640, Adjustment ±0.0002 (Not for Asbestos Identification See SERIES E Liquids) Price
Stable, colorless at the low end and increasing to faint yellow at the high end.
18091 A-1...........Full Set;  Intervals 0.002;  91 liquids $1,419.00
18092 A-1/2........Half Set;  Intervals 0.004; 46 liquids 784.75
18095 A-1/5........Fifth Set;  Intervals 0.01;  19 liquids 314.00
1809X A-x...........Any liquid selected, standard 1/4 fl. oz. (7cc) 26.75
1809Y A-xx.........Any liquid selected, 1 fl. oz. (30 cc) 76.50

Cat. #

SERIES B: Certified, Range nD 1.642-1.700, Adjustment ±0.0002

Price
Stability inversely related to index. Color increases with index to yellow or yellow brown.
18121 B-1...........Full Set;  Intervals 0.002;  30 liquids $971.75
18122 B-1/2........Half Set;  Intervals 0.004;  15 liquids 548.75
18125 B-1/5........Fifth Set;  Intervals 0.01;  6 liquids 217.75
1812X B-x...........Any liquid selected, standard 1/4 fl. oz. (7 cc) 55.50
1812Y B-xx.........Any liquid selected, 1 fl. oz. (30 cc) 165.00

Cat. #

SERIES M: Range nD 1.705-1.800, Adjustment ±0.0005

Price
Methylene iodide formulation, keep well stoppered. 1.74 to 1.78 liquids contain sulfur imparting yellow color. 1.79 to 1.80 liquids have iodide added, dark red color. As methylene iodide evaporates, 1.705 to 1.735 liquids decrease in index. 1.74 liquids and up increase in index and may form crystals.
18151 M-1..........Full Set;  Intervals 0.005;  20 liquids $652.75
18152 M-1/2.......Half Set;  Intervals 0.01;  10 liquids 363.25
1815X M-x..........Any liquid selected, standard 1/4 fl. oz. (7cc) 56.75
1815Y M-xx........Any liquid selected, 1 fl. oz. (30 cc) 160.25

Please note that the following Refractive Index Liquids and Melts ( Series H, EH ) are considered hazardous. They contain arsenic tribromide and should be used with caution. Series H and EH have been discontinued for various reasons. We apologize for any inconvenience that this may cause. We have limited stock available; please call to check availability.

Cat. #

SERIES H: Range nD 1.81-2.00, Adjustment ±0.0015

Price
Quite stable. Color varies from yellow to brown. Toxic and corrosive. A super-saturated solution. May crystallize with time and low temperature. Formulation: arsenic tribromide, arsenic disulfide and sulfur.
1818X H-x...........Any liquid selected, standard 1/4 fl. oz. (7 cc) $71.00
1818Y H-xx.........Any liquid selected, 1 fl. oz. (30 cc) 209.00

Cat. #

SERIES EH: Range nD 2.01-2.11, Adjustment ±0.0015

Price
Quite stable. Similar to Series H but contains selenium. Toxic and corrosive. Darker color, more viscous.
1821X EH-x.........Any liquid selected, standard 1/4 fl. oz. (7 cc) $107.25
1821Y EH-xx.......Any liquid selected, 1 fl. oz. (30 cc) 308.00

HIGH DISPERSION GROUP

High Dispersion Liquids specially formulated or selected from Standard Series for dispersion staining, focal masking, and double variation refractometry.
Available as complete set covering the 1.500 to 1.800 range:

Cat. #   Price
18461 HD-1.........Full Set;  Consists of E-1, B-1/2, M-1, Int.. 0.005 on E and M Series, 0.004 on B Series, 64 liquids $1,797.00
18462 HD-1/2........Half Set;  Consists of E-1/2, B-1/5, M-1/2;  Int. 0.01;  31 liquids 988.50
  -Or available as Individual Series or Selected Liquids-
Cat. #

SERIES E: Range nD 1.500-1.640, Adjustment ±0.0005 (For use with Asbestos Identification)

Price
Specially formulated for high dispersion. Slightly volatile, keep tightly stoppered. Supplied with optical constants for F, D, and C lines. Recommended by prominent microscopists who have developed and published these techniques.
18431 E-1...........Full Set;  Intervals 0.005;  29 liquids $913.25
18432 E-1/2........Half Set;  Intervals 0.01;  15 liquids 509.25
1843X E-x...........Any liquid selected, standard 1/4 fl. oz. (7 cc) 53.25
1843Y E-xx.........Any liquid selected, 1 fl. oz. (30 cc) 152.50

Cat. #

SERIES B: Certified, Range nD 1.642-1.700, Adjustment ±0.0002

Price
Contains the high dispersion characteristic
18122 B-1/2........Half Set;  Intervals 0.004;  15 liquids $548.75
18125 B-1/5........Fifth Set;  Intervals 0.01;  6 liquids 217.75

Cat. #

SERIES M: Range nD 1.705-1.800, Adjustment ±0.0005

Price
Contains the required high dispersion characteristic
18151 M-1..........Full Set;  Intervals 0.005;  20 liquids $652.75
18152 M-1/2.......Half Set;  Intervals 0.01;  10 liquids 363.25
1815X M-x..........Any liquid selected, standard 1/4 fl. oz. (7 cc) 56.75
1815Y M-xx........Any liquid selected, 1 fl. oz. (30 cc) 160.25

Standard packaging is 1/4 fl. oz. (7 cc) bottles with applicator caps. Liquids are standardized for the D line (5893 A) at 25°C.

Sets are packed in attractive, partitioned boxes for convenient access and orderly storage. Temperature coefficients and dispersion values are included on each index liquid label.

If any of the "1/2" sets have been purchased, the other "1/2" can be ordered by specifying "1/2 alternate" to obtain the complete "1" set(s).

Selected assortments may be ordered in the "X" listings. When quantity justifies, the price base of the nearest set will apply.

All prices are subject to change without notice. Please contact us to confirm prices.
Site Last Modified January 16, 2017
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All trademarks and trade names are the property of their respective owners.

Telephone: (973)-239-6633

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Web Resources

[ FSU Microscopy Reference ]: Excellent site for information on light refraction, microscopy, microphotography...

[ Modern Microscopy ]: A periodic on-line journal devoted to the world of microscopy. Every issue we will present articles, interviews, book reviews and columns by some of the most experienced researchers in the field.

[ McCrone Institute ]: Illinois not-for-profit corporation devoted to applied microscopy...

[ McCrone UK Ltd ]: