Loctite SI 5240

  • Description for Loctite SI 5240

    A self-leveling, UV or visible light silicone that also features a secondary moisture cure. Makes transparent, white-tinted seal or bonds.

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    Application Type Sealant, Bond, Potting, Coating
    1 Part or 2 Part 1 Part
    Material Form Liquid
    Chemistry Silicone, Alkoxy silicone
    Cure Method Humidity, UV/visible
    Viscosity (cPs) 15,000 to 35,000, Self leveling
    Color Clear, Yellow to green tint slight haze permissible
    High Temperature Resistance (°C) 93
    Low Temperature Resistance (°C) -54
    Key Specifications ISO-10993
  • Technical Data

    Overview
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    Specifications
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  • Best Practices

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Viscosity Test Methods
Viscosity Temperature Test Method
15,000 to 35,000 cPs 25°C Brookfield - RVT, Spindle 5, speed 10 rpm
Self leveling Viscosity Test Method
Tack Free Time Test Methods
Tack Free Time Test Method
50 to 55 min Tack Free Time is the time required to achieve a tack free surface, Zeta® 7760: 225 mW/cm², measured @ 320 to 400 nm
90 to 105 min Tack Free Time is the time required to achieve a tack free surface, Zeta® 7411-S: 50 mW/cm², measured @ 320 to 400 nm
1.50 to 1.75 min Tack Free Time is the time required to achieve a tack free surface, Zeta® 7215: 90 mW/cm², measured @ 320 to 400 nm
0.08 to 0.17 min Tack Free Time is the time required to achieve a tack free surface, Electrodeless, H bulb: 500 mW/cm², measured @ 320 to 400 nm
Fixture or Handling Strength Time Test Methods
Fixture or Handling Strength Time Fixture-Handling Strength Test Method
0.08 to 0.17 min Fixture time is defined as the time to develop a shear strength of 0.1 N/mm². UV Fixture Time, Glass microscope slides, seconds: Medium Pressure Hg Arc source, Zeta® 7215: 70 mW/cm², measured @ 320-400 nm
0.08 to 0.17 min Fixture time is defined as the time to develop a shear strength of 0.1 N/mm². UV Fixture Time, Glass microscope slides, seconds: Electrodeless system, H bulb: 500 mW/cm², measured @ 320-400 nm
0.08 to 0.17 min Fixture time is defined as the time to develop a shear strength of 0.1 N/mm². UV Fixture Time, Glass microscope slides, seconds: Zeta® 7760 UV wand system: 225 mW/cm², measured @ 320-400 nm
0.08 to 0.17 min Fixture time is defined as the time to develop a shear strength of 0.1 N/mm². UV Fixture Time, Glass microscope slides, seconds: Zeta® 7411-S flood system: 50 mW/cm², measured @ 320-400 nm
Linear Shrinkage Test Methods
Linear Shrinkage Test Method
0.30 % ISO 1675
0.80 % ISO 1675, Volume shrinkage
Shear Strength Test Methods
Shear Strength Substrate Type Test Method
145 psi Aluminum to Glass Lap Shear Strength Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 4587
155 psi Steel to Glass Lap Shear Strength Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 4587
85 psi Glass to Glass Lap Shear Strength Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 4587
140 psi PVC to Glass Lap Shear Strength Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 4587
100 psi ABS to Glass Lap Shear Strength Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 4587
Tensile Strength Test Methods
Tensile Strength Test Method Test Time Test Temperature
>435 psi Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 527-3
80 psi After 7 days @ 22 °C / 50% RH, Moisture cure only, at break, ISO 527-3 >10,080 min 22°C
110 psi After 14 days @ 22 °C / 50% RH, Moisture cure only, at break, ISO 527-3 >20,160 min 22°C
Tear Strength Test Methods
Tear Strength Test Method Test Time Test Temperature
72 (lb./in.) Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 34-1 , Die C
11 (lb./in.) After 7 days @ 22 °C / 50% RH, Moisture cure only, ISO 34-1 , Die C 10,080 min 22°C
21 (lb./in.) After 14 days @ 22 °C / 50% RH, Moisture cure only, ISO 34-1 , Die C 20,160 min 22°C
Dielectric Constant Test Methods
Dielectric Constant Test Method
2.80 IEC 60250, 1 KHz
2.80 IEC 60250, 1 MHz
Dielectric Strength Test Methods
Dielectric Strength Test Method
21 (kV/mm) Dielectric Breakdown Strength, IEC 60243-1
Dissipation Factor Test Methods
Dissipation Factor Test Method
0.05000 IEC 60250, 1 KHz
0.00400 IEC 60250, 1 MHz
Surface Resistivity Test Methods
Surface Resistivity Test Method
5.15e15 (ohm) IEC 60093
Volume Resistivity Test Methods
Volume Resistivity Test Method
1.2e15 (ohm-cm) IEC 60093
Shore A Hardness Test Methods
Shore A Hardness Shore Hardness Test Method
>40 ISO 868, Durometer, Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C
Elongation Test Methods
Elongation Test Method
250 to 450 % Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, at break, ISO 527-3
730 % After 7 days @ 22 °C / 50% RH, Moisture cure only, at break, ISO 527-3
530 % After 14 days @ 22 °C / 50% RH, Moisture cure only, at break, ISO 527-3
Modulus Test Methods
Modulus Test Method
145 psi Tensile Modulus, at 100% elongation, ISO 527-2, Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C
20 psi Tensile Modulus, at 100% elongation, ISO 527-3, After 7 days @ 22 °C / 50% RH, Moisture cure only
30 psi Tensile Modulus, at 100% elongation, ISO 527-3, After 14 days @ 22 °C / 50% RH, Moisture cure only
Coefficient of Thermal Expansion (CTE) Test Methods
Coefficient of Thermal Expansion (CTE) CTE Test Method
285e-6 (K-1) Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 11359-2, Pre Tg
390e-6 (K-1) Cured @ 70 mW/cm², measured @ 365 nm for 60 seconds per side, using a medium pressure mercury arc light source, followed by 7 days @ 22 °C, ISO 11359-2, Post Tg