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    Low Outgassing Epoxy and Adhesives Product Comparison Table

    Low outgassing adhesives are designed to minimize the release of volatile gases when exposed to heat, reduced pressure, or both. In fiber optic applications, even small amounts of outgassing from adhesives used in connectors can cause contamination, leading to signal loss and reduced reliability. These adhesives are commonly used in fiber optics, aerospace, and electronics where performance in controlled environments is critical.

    In aerospace applications, materials are evaluated using ASTM E595, a NASA low outgassing test standard, in which samples are exposed to 125 °C for 24 hours in a vacuum and must meet ≤1.0% Total Mass Loss (TML) and ≤0.10% Collected Volatile Condensable Material (CVCM). In fiber optic applications, adhesive material may be tested in accordance with Telcordia GR-1221, which uses thermogravimetric analysis (TGA) to measure weight loss and to confirm proper cure.

    Use the comparison table below to evaluate low outgassing adhesives and identify the right material for your application. If you have any questions, please contact Kelly Barker, Epoxy Expert.
    Product Adhesive Type Passes NASA
    ASTM E595    		 TML* CVCM** Curing Pot Life Viscosity (cps) Tg (°C) Coefficient of
    Thermal Expansion
    (CTE)

    AB9112

    		 Optical Adhesive

    MIL-SPEC and US Navy Approved    		 ? ? ? Minimum Cure Schedule, by DCS:
    • @ 25°C for 12-18 Hours
    • @ 65°C for 30-60 Minutes
    • @ 90°C for 15 Minutes
    • @ 100°C for 5 Minutes
    		 40 Minutes

    		 2,000 93.5°C ?

    AB9320

    		 Heat Cure Adhesive for Multimode and Single Mode Terminations Yes 0.85% 0.00% Minimum Cure Schedule, by DCS:
    • @ 80°C for 30-120 Minutes
    • @ 90°C for 15-60 Minutes
    • @ 100°C for 10-30 Minutes
    		 60-90 Minutes

    		 < 1,800 110°C 70ppm (est. below Tg)

    AB9320CLR

    		 Heat Cure Adhesive for Multimode and Single Mode Terminations Yes 0.85% 0.00% Minimum Cure Schedule, by DCS:
    • @ 80°C for 30-120 Minutes
    • @ 90°C for 15-60 Minutes
    • @ 100°C for 10-30 Minutes
    		 60-90 Minutes

    		 < 1,800 110°C 70ppm (est. below Tg)

    ET353ND

    		 Optical Epoxy Yes 0.76% 0.01% @ 150°C - 1 Hour ≤ 3 Hours 3,000-5,000 ≥ 90°C Below Tg: 54 x 10-6 in/in°C
    Above Tg: 206 x 10-6 in/in°C

    ET301

    		 Optical Epoxy Yes 0.98% 0.01% @ 65°C - 1 Hour 1-2 Hours 100-200 ≥ 65°C Below Tg: 39 x 10-6 in/in°C
    Above Tg: 98 x 10-6 in/in°C

    ET301-2

    		 Optical Epoxy Yes 0.89% 0.01% @ 80°C - 3 Hours 8 Hours 225-425 ≥ 80°C Below Tg: 61 x 10-6 in/in°C
    Above Tg: 180 x 10-6 in/in°C

    ET302-3M

    		 Optical Epoxy Yes 0.70% 0.01% @ 65°C - 3 Hours
    @ 25°C - 7 days    		 1 Hour 800-1,600 ≥ 55°C Below Tg: 56 x 10-6 in/in°C
    Above Tg: 193 x 10-6 in/in°C

    ET323

    		 Optical Adhesive ? ? ? @ 150°C - 1 Hour 24 Hours 3,500-5,000 ≥ 100°C Below Tg: 51 x 10-6 in/in°C
    Above Tg: 185 x 10-6 in/in°C

    ET375

    		 Optical Adhesive ? ? ? @ 150°C - 30 Minutes 4 Hours 3,000-5,000 ≥ 100°C Below Tg: 48 x 10-6 in/in°C
    Above Tg: 192 x 10-6 in/in°C

    ET383ND

    		 Optical Adhesive ? ? ? @ 150°C - 1 Hour 4 Hours 3,000-5,000 ≥ 100°C Below Tg: 34 x 10-6 in/in°C
    Above Tg: 129 x 10-6 in/in°C

    OG116-31

    		 Optical Adhesive ? ? ? UV Cure - 2 minutes (320-500nm) ? 20,000-30,000 ≥ 115°C Below Tg: 41 x 10-6 in/in°C
    Above Tg: 170 x 10-6 in/in°C

    OG198-54

    		 Optical Adhesive ? ? ? UV Cure - 2 minutes (320-500nm) ? 200-450 ≥ 115°C Below Tg: 74 x 10-6 in/in°C
    Above Tg: 145 x 10-6 in/in°C

    ETH70E

    		 Thermally Conductive, Electrically Insulating Adhesive Yes 0.99% 0.03% @ 150°C - 1 Hour
    @ 60°C - 12 Hours    		 56 Hours 4,000-7,000 ≥ 80°C Below Tg: 15 x 10-6 in/in°C
    Above Tg: 64 x 10-6 in/in°C

    ETH74

    		 Thermally Conductive Adhesive Yes 0.56% 0.00% @ 150°C - 30 Minutes 2 Hours 45,000-65,000 ≥ 100°C Below Tg: 21 x 10-6 in/in°C
    Above Tg: 95 x 10-6 in/in°C

    ET301-2

    		 Optical Epoxy Yes 0.89% 0.01% @ 80°C - 3 Hours 8 Hours 225-425 ≥ 80°C Below Tg: 61 x 10-6 in/in°C
    Above Tg: 180 x 10-6 in/in°C

    ETH20E

    		 Electrically & Thermally Conductive Adhesive Yes 0.62% 0.01% @ 150°C - 1 Hour
    @ 245°C - 4 Hours    		 2.5 Days 2,200-3,200 ≥ 80°C Below Tg: 31 x 10-6 in/in°C
    Above Tg: 158 x 10-6 in/in°C

    ET377

    		 Optical Adhesive Yes 0.54% 0.02% @ 150°C - 1 Hour 24 Hours 150-300 ≥ 95°C Below Tg: 57 x 10-6 in/in°C
    Above Tg: 210 x 10-6 in/in°C

    OP-81-LS

    		 Low Shrinkage Epoxy Yes 0.37% 0.01% Heat Cure:
    @ 80°C - 30-35 Minutes
    @ 85°C - 20-25 Minutes    		 ? 7 Days 60,000 153°C Below Tg: 25 µm/m/°C
    Above Tg: 97 µm/m/°C

    OP-83-LS

    		 Low Shrinkage Epoxy ? ? ? Heat Cure:
    @ 80°C - 30-35 Minutes
    @ 85°C - 20-25 Minutes    		 ? 5 Days 86,000 184°C Below Tg: 31 µm/m/°C
    Above Tg: 77 µm/m/°C
    * Total Mass Loss (TML)
    **Collected Volatile Condensable Materials (CVCM)