EPO-TEK OG198-54

Single-component shadow-curable UV epoxy, 200–450 cPs, Tg ≥115°C, die shear 20.8 Kg (UV+RT), ≥97% transmission @ 460–1,680 nm, refractive index 1.5256 (cured), electrically and thermally insulating.

Product code:

OG198-54

Package size:

Shelf Life:

6 months refrigerated

RoHS Compliant

EPO-TEK OG198-54 is a single-component, low-viscosity shadow-curable UV epoxy that is electrically and thermally insulating. Manufactured by Epoxy Technology, Inc., its shadow-cure capability allows it to cure in areas not directly exposed to UV — critical for complex optical assemblies with hidden bond lines. It delivers ≥97% transmission at 460–1,680 nm and Tg ≥115°C after full cure.

Features & Benefits

Shadow cure capability — cures in UV-unexposed areas for complex optical assemblies
Low viscosity (200–450 cPs) for precise, bubble-free dispensing in optical packages
Excellent optical clarity ≥97% transmission @ 460–1,680 nm
Electrically and thermally insulating — safe for sensitive electronic environments
High Tg ≥115°C for solder reflow and high-temperature service
Die shear 20.8–22.2 Kg after UV + post-cure for reliable structural bonds

Typical Applications

Optical component bonding with shadow areas not reachable by direct UV irradiation
Fiber optic and waveguide bonding in photonic packaging
Lens attachment and encapsulation requiring low viscosity and shadow cure
Die encapsulation in optoelectronic assemblies requiring UV and thermal stability

Property	Value	Test Method / Condition
Color (before cure)	Clear/Colorless	Visual
Viscosity (23°C @ 100 rpm)	200–450 cPs	—
No. of Components	Single	—
Glass Transition Temp	≥115°C	Dynamic Cure
CTE Below Tg	74 × 10⁻⁶ in/in°C	—
Shore D Hardness	86	—
Die Shear — UV only	≥10 Kg (3,556 psi)	—
Die Shear — UV + 23°C/24 hrs	20.8 Kg (7,397 psi)	—
Die Shear — UV + 80°C/1 hr	22.2 Kg (7,894 psi)	—
Spectral Transmission	≥97% @ 460–1,680 nm	—
Refractive Index (uncured)	1.5046 @ 589 nm	—
Refractive Index (cured)	1.5256 @ 589 nm	—
Electrical/Thermal	Electrically and thermally insulating	—
Shadow Cure	Yes — cures in UV-unexposed areas	—
Recommended Cure	Iron-doped Hg flood lamp >30 sec, 100 mW/cm² @ 240–365 nm	—

Property

Value

Test Method / Condition

Color (before cure)

Clear/Colorless

Visual

Viscosity (23°C @ 100 rpm)

200–450 cPs

—

No. of Components

Single

—

Glass Transition Temp

≥115°C

Dynamic Cure

CTE Below Tg

74 × 10⁻⁶ in/in°C

—

Shore D Hardness

—

Die Shear — UV only

≥10 Kg (3,556 psi)

—

Die Shear — UV + 23°C/24 hrs

20.8 Kg (7,397 psi)

—

Die Shear — UV + 80°C/1 hr

22.2 Kg (7,894 psi)

—

Spectral Transmission

≥97% @ 460–1,680 nm

—

Refractive Index (uncured)

1.5046 @ 589 nm

—

Refractive Index (cured)

1.5256 @ 589 nm

—

Electrical/Thermal

Electrically and thermally insulating

—

Shadow Cure

Yes — cures in UV-unexposed areas

—

Recommended Cure

Iron-doped Hg flood lamp >30 sec, 100 mW/cm² @ 240–365 nm

—

Need this product for your project?

Request a Consultation

Fill in your requirements — our team will respond within 24 hours.