Matching Liquids

Specialized Optical Coupling (index matching) Liquids that closely match the refractive index of common materials (Fused Silica, BK 7 and Water) at given wavelengths. Please contact our technical department for optical coupling of additional materials.

Read More about Immersion Liquids

Cargille’s fused silica matching liquids precisely match the refractive index of fused silica at the HeNe wavelength (632.8 nm) and also very closely match the dispersion of fused silica. Other custom formulations will match the refractive index of fused silica at other wavelengths.

Fused Silica Matching Liquid Applications: In development as well as in field applications, Cargille’s fused silica matching immersion liquids will be very useful to those working with fused silica optical fibers, preforms, windows, and other optical components.

Cargille’s fused silica matching liquids are colorless, odorless and non-toxic. They are soluble in naphtha, ethyl ether, xylene, and methylene chloride; partly soluble in acetone; and insoluble in water and ethanol. The liquids have a known incompatibility with Latex rubber.

Fused Silica Matching Liquid Code 50350

Cat #: 19569
Code: 50350
Viscosity (cSt at 25 degrees Celsius): 19
Cloud Point (degrees Celsius): <1

Fused Silica Matching Liquid Code 06350

Cat #: 19571
Code: 06350
Viscosity (cSt at 25 degrees Celsius): 80
Cloud Point (degrees Celsius): none

Cargille’s BK 7 glass Matching Liquid matches the refractive index, nD = 1.5167, and matches the refractive dispersion of BK 7 glass better than any other liquid. The liquid has long term stability and has moderately high viscosity ( similar to syrup and Cargille Immersion Oil Type B ) which helps to hold coupled components together during manipulation and assembly.

BK 7 Matching Liquid

Cat #: 19586
Code: 81520

Cargille’s Acrylic Matching Liquid nD = 1.4917 amazingly matches the refractive index and the refractive dispersion of PMMA. It has very long term stability and high viscosity ( similar to honey ) which helps hold components in place.

Acrylic Matching Liquid

Cat #: 19576
Code: 5032

Cargille’s Double Acrylic Matching Liquid nD = 1.4917 matches the refractive index, dispersion and density of PMMA.

Acrylic Double Matching Liquid

Cat #: 19577
Code: 4211395

Viscosity (cSt at 25 degrees Celsius): 80

Cargille’s Water Matching Liquid matches the refractive index of water at 589.3nm at 23°C for work at room temperate or at 37°C for use as elevated temperatures. It is colorless and color stable in direct sunlight.

Water Matching Liquid at 23°C

Cat #: 20113
Code: 3421
n= 1.333 ±0.0005 at 589.3 nm and 23°C

Water Matching Liquid at 37°C

Cat #: 20114
Code: 3421
n= 1.331 ±0.0005 at 589.3 nm and 37°C