Item Name: Dymax OP-81-LS
Manufacturer: Dymax Corporation
Technologies: Light-curable epoxy-based adhesive with low shrinkage and optical clarity
Color: Clear
Cure Type: UV/Visible light cure
Package Size: Contact to Techniq VN for details.
Shelf Life: 12 months
Dymax Low-Shrink™ OP-81-LS is a UV/Visible light-curable epoxy adhesive specifically engineered for optical assembly. It is distinguished by its exceptionally low volumetric shrinkage and low coefficient of thermal expansion (CTE), ensuring stability during thermal cycling. The material is formulated as a one-component system, requiring no mixing, and features a dual curing mechanism: rapid UV curing complemented by low-temperature heat curing (80–85 °C). Designed to meet ASTM E595 outgassing standards, OP-81-LS is shipped and stored under cold conditions (1–5 °C) to preserve its integrity.
The adhesive is intended for high-precision optical assemblies, particularly where dimensional stability and minimal shrinkage are critical. Key applications include:
Optical positioning
Lens and prism alignment
Fiber positioning
It adheres effectively to polycarbonate, acrylic, glass, and metallic substrates, making it highly versatile in advanced optical device manufacturing.
| Category | Property | Value | Test Method |
|---|---|---|---|
| Uncured | Solvent Content | No Nonreactive Solvents | N/A |
| Chemical Class | Epoxy | N/A | |
| Appearance | Off-white opaque to charcoal translucent gel | N/A | |
| Density (g/ml) | 1.6 | ASTM D1875 | |
| Viscosity (cP) | 60,000 (nominal) | DSTM 502‡ | |
| Shelf Life (1–5 °C storage) | 7 months | N/A | |
| Cured Mechanical | Durometer Hardness | D90 | ASTM D2240 |
| Tensile Strength (MPa [psi]) | 45 [6,600] | ASTM D638 | |
| Elongation at Break (%) | 2 | ASTM D638 | |
| Modulus of Elasticity (MPa [psi]) | 1,600 [230,600] | ASTM D638 | |
| Other Cured Properties | Boiling Water Absorption (2 h, %) | 0.9 | ASTM D570 |
| Water Absorption (24 h, 25 °C, %) | 0.1 | ASTM D570 | |
| Volumetric Shrinkage (%) | 1.5 | DSTM 611 |
‡ DSTM = Dymax Standard Test Method
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