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Frequently Asked Questions

OF-138 is a low refractive index primary coating material designed for the cladding of optical fibers.

The proprietary adhesion promoter in OF-138 improves adhesion to the silica core of the fiber, especially under wet conditions.

In its liquid state, OF-138 has a refractive index of 1.374 at 589 nm, a density of 1.51 g/cm3, and a viscosity of 3300 cps at 25°C.

OF-138 should be stored in glass bottles, kept closed to avoid moisture penetration, and stored at ambient conditions of 10-30ºC.

OF-138 is applied in optical fiber drawing towers and cured under nitrogen using a UV source in the range of 300-400 nm. A dose of 1000-2000 mJ/cm2 is typically necessary for proper curing.

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