MATERIALS, ADHESIVES AND COATINGS
EP30LTE-LO, EP21LSCL-2, EP30-4, EP114, EP5LTE-100 optically clear and low-CTE epoxies for optics and precision assemblies
Country: · Model: EP30LTE-LO, EP21LSCL-2, EP30-4, EP114, EP5LTE-100
Optically clear epoxies with a controlled refractive index and low-CTE compounds for optics, photonics and precision assemblies. The refractive index in the group is from 1.55 to 1.57, and the lowest CTE is 8–12·10⁻⁶ 1/°C. They are used for lenses, prisms, mirrors, fiber optics, laser modules and telescopes.
- EP30LTE-LO
- 2K, CTE 15–18·10⁻⁶ 1/°C, from 4 K to +121 °C, 85–95 Shore D, ASTM E595, MIL-STD-810G
- EP21LSCL-2
- 2K, optically clear, non-yellowing; A 1500–2500 mPa·s; overnight at 24 °C + 3–5 h at 60–79 °C; −51…+177 °C; n = 1.57; ASTM E595
- EP30-4
- 2K, optically clear; A 1000–3000 mPa·s; 24 h at 24 °C; −51…+121 °C; n = 1.55
- EP114
- 2K, nanosilicate, clear; 500–1500 mPa·s; step cure 121→149→177 °C; −73…+288 °C; Tg 210–215 °C; modulus > 6.9 GPa; ASTM D4060, ASTM E595
Technical specifications
| EP30LTE-LO | 2K, CTE 15–18·10⁻⁶ 1/°C, from 4 K to +121 °C, 85–95 Shore D, ASTM E595, MIL-STD-810G |
|---|---|
| EP21LSCL-2 | 2K, optically clear, non-yellowing; A 1500–2500 mPa·s; overnight at 24 °C + 3–5 h at 60–79 °C; −51…+177 °C; n = 1.57; ASTM E595 |
| EP30-4 | 2K, optically clear; A 1000–3000 mPa·s; 24 h at 24 °C; −51…+121 °C; n = 1.55 |
| EP114 | 2K, nanosilicate, clear; 500–1500 mPa·s; step cure 121→149→177 °C; −73…+288 °C; Tg 210–215 °C; modulus > 6.9 GPa; ASTM D4060, ASTM E595 |
| EP5LTE-100 | 1K, CTE 8–12·10⁻⁶ 1/°C, 90–120 min at 100 °C, −60…+175 °C, Tg 120–125 °C, ASTM E595 |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
EP30LTE-LO is a two-component epoxy with a CTE of 15–18·10⁻⁶ 1/°C and 85–95 Shore D, working from 4 K to +121 °C, meeting ASTM E595 and tested for fungus resistance to MIL-STD-810G. A night at room temperature and 4–8 hours at 66–93 °C are recommended. EP5LTE-100 is a one-component flowable material with a CTE of 8–12·10⁻⁶ 1/°C, curing in 90–120 minutes at 100 °C, Tg 120–125 °C. EP21LSCL-2 has low viscosity, does not yellow, has a refractive index of 1.57 and a range of −51…+177 °C. EP30-4 with a refractive index of 1.55 cures in 24 hours at room temperature, for optical parts and fiber-optic assemblies. EP114 with silica nanoparticles has a viscosity of 500–1500 mPa·s, Tg 210–215 °C, a modulus above 6.9 GPa and works from −73 to +288 °C; it cures in steps at 121, 149 and 177 °C and is abrasion-resistant to ASTM D4060.
How to choose
For alignment stability as temperature changes, look at EP30LTE-LO with a CTE of 15–18·10⁻⁶ 1/°C or EP5LTE-100 with an even lower 8–12·10⁻⁶ 1/°C. If clarity and absence of yellowing matter, take EP21LSCL-2 or EP30-4, and for silicon wafers, glass and temperatures up to +288 °C EP114. EP5LTE-100 is one-component, the rest are two-component. For fast curing of optical assemblies the manufacturer also offers UV- and LED-curable systems.
Request a price and lead time
EP30LTE-LO, EP21LSCL-2, EP30-4, EP114, EP5LTE-100 optically clear and low-CTE epoxies for optics and precision assemblies. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is the CTE of EP30LTE-LO?
15–18·10⁻⁶ 1/°C at a hardness of 85–95 Shore D. The material works from 4 K to +121 °C.
What is the refractive index of EP21LSCL-2?
1.57. The compound is optically clear, does not yellow and works from −51 to +177 °C.
How does EP114 cure?
In steps at 121, 149 and 177 °C. Tg 210–215 °C, operating range −73…+288 °C.
Is there a one-component low-CTE epoxy among these?
Yes, EP5LTE-100 with a CTE of 8–12·10⁻⁶ 1/°C. It cures in 90–120 minutes at 100 °C.
What is the viscosity of EP114?
500–1500 mPa·s. The system is clear, contains silica nanoparticles and has a modulus above 6.9 GPa.
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