• Description for Bostik 940A Fast Set Adhesive/Sealant

    One component; fast setting hybrid polymer; UV resistant; superior adhesion to porous and non-porous surfaces; long open time.

    *See Terms of Use Below

    Application Type Bond, Seal
    1 Part or 2 Part 1 Part
    Material Form Paste
    Substrate Copper, Nonporous Substrates, Porous, Fiberglass, Glass, Metal: Brass, Metal: Zinc, Polyester, PVC, Rubber: EPDM rubber, Steel: Galvanized steel, Stainless Steel, painted or lacquered wood., FRP, Aluminum
    Manufacturer Bostik
    Chemistry SMP (Silyl Modified Polymer)
    Cure Method Room Temperature Cure
    Cure Temperature (°C) 25, 25
    Cure Time (min) 1,440 to 2,880, 20,160
    High Temperature Resistance (°C) 100, Outstanding
    Low Temperature Resistance (°C) Outstanding, -40
  • Technical Data

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  • Best Practices

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Cure Temperature Test Methods
Cure Temperature Cure Time Test Method
25°C Uncured, @77°F/50%RH/0.125"
Cure Time Test Methods
Cure Time Test Method
1,440 to 2,880 min Uncured, @77°F/50%RH/0.125"
20,160 min AFTER 14 DAYS CURE AT 77°F AND 50% RH
Tack Free Time Test Methods
Tack Free Time Test Method
35 min Uncured
Work / Pot Time Test Methods
Work / Pot Time Test Method
45 min Uncured
Tensile Strength Test Methods
Tensile Strength Cure Time Cure Temperature Cure Humidity Substrate Test Method
400 psi 20,160 min 25°C 50 % Aluminum-to-Aluminum @ 100%., after 14 days cure at 77°F and 50% RH, 0.08", speed—2-in./min.
450 psi 20,160 min 25°C 50 % Aluminum-to-Aluminum @ Break, after 14 days cure at 77°F and 50% RH, 0.08", speed—2-in./min.
375 psi 20,160 min 25°C 50 % Aluminum-to-Aluminum 0.08", speed—2-in./min, AB481after 14 days cure at 77°F and 50% RH
Green Strength Test Methods
Green Strength Test Method
2.3 (lbs. - force/ft2) Uncured, @ 0.125-in. thick, without sag
Elongation Test Methods
Elongation Test Method
225 % after 14 days cure at 77°F and 50% RH
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method Hardness Temperature
55 after 14 days cure at 77°F and 50% RH 25°C
Specific Gravity Test Methods
Specific Gravity Temperature Test Method
1.4 (g/ml) 25°C after 14 days cure at 77°F and 50% RH