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Cargille™ Gem Refractometer Liquid Characteristics






Composition Methylene Iodide with dissolved solids
Appearance Golden yellow liquid
Odor Characteristic

Color Stability In sun: Will become very dark after I day
(Note: When stored in the dark the color is stabilized for up 5 years by the small piece of copper normally placed in the bottle by Cargille Labs)

Index Change Rate by Evaporation High: A 1/4 fl. oz. bottle open 5 days: full bottle changed +0.00130; half full (10 gram) changed +0.00207

Pour Point °C < 20
Boiling Point °C @ 760mm Hg > 180
Flash Point °C COC None
Density g/cc @ 25 °C 3.135
Density Temp. Coef. g/cc °C -0.0023
Coef. of Therm. Exp. cc/cc/ °C0.0007
Viscosity centistokes @ 25 °C2
Soluble: No common solvents

Partly Soluble: Acetone, Carbon Tetrachloride, Ethyl Ether, Methylene, Chloride, Toluene, Xylene

Insoluble, Ethanol, Freon TF, Heptane, Naphtha, Turpentine, Water

Clean Up: Wipe until dry with tissue, then use soap and water if further cleaning needed. Avoid letting liquid evaporate leaving crystals behind. To help remove crystals: Soak in soap and water or Carbon Tetrachloride or use of scouring pad when not injurious to item cleaned.

Compatibility: May soften some plastics (Especially Polystyrene, Polyethylene, and Polyurethane) and may affect epoxy, rubber (including Silicone and Neoprene), and will corrode Aluminum, Brass, Copper, and Steel

Toxicity      Moderate (request MSDS)

Cauchy Equation: Refractive index as a function of wavelength at 25 °C
W = Wavelenght in angstroms (Å)
n(W) = 1.756723 + (1463579) /W^2+ (1.34422E+13) /W^4


Source orWavelengthRefractive Index% Transmittance 25 °C
Spectral Line(angstroms)25 °C1 mm1cm 10cm

Near UV cut off 45001.86500
F (Cd) 48001.84688280
F (H) 48611.84389320
Ar laser 48801.84290350
e (Hg) 54611.82195621


d (He) 58761.810988213
D (Na) D1, D2 mean 58931.810988214
He laser 63281.802999035
C (Cd) 64391.800999140
C (He) 65631.798999243


Ruby laser 69431.793999455
GaAs laser 84001.7801009990
Nd: YAG laser 106481.771009774
Diode 130001.7710010096
Diode 155001.76999349


nF - nC =      0.0448
Abbe vD: (nD - 1) / (nF - nC) =      78.1
Temp. coef dnD / dt 20 - 25 °C =      -0.000680

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Monday July 07, 2008
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