LOCTITE 5039

Harmonization Code : 3919.10.80 | Other self-adhesive plastic rolls not exceeding 20 cm wide.

LOCTITE 5039

Main features

  • Deep Light-Cure Gasketing
  • Shadow-Area Moisture Cure
  • Continuous-Bead Semi-Flowable Application

Product Description

LOCTITE SI 5039 is a one-component, semi-flowable acetoxy silicone adhesive and sealant with UV/visible primary cure and secondary moisture cure for shadowed areas. Its flow characteristics facilitate even knit lines and continuous beads for cure-in-place gasketing, bonding and sealing. Under specified 365 nm exposure, the material reaches a tack-free surface in 20 seconds or less and a light-cure depth of at least 10 mm after 60 seconds. The light-yellow translucent paste forms an elastomer with Shore A hardness of 32 to 48 and elongation of at least 150% after the stated cure.

Key features

  • Deep light cure: Depth of cure is at least 10 mm after 60 seconds at 70 mW/cm^2 and 365 nm.
  • Shadow-area cure: Atmospheric moisture provides the secondary cure mechanism in shadowed regions.
  • Continuous-bead flow: Semi-flowable behavior facilitates even knit lines and continuous beads.

Applications

Cure-in-place gasketing, bonding and sealing where light cure and moisture cure in shadowed areas are useful.

Product Family

LOCTITE 5039

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TDS, SDS & Technical Documents

Technical Specifications

General Properties
Appearance
Appearance at room temperature.
Light yellow, translucent paste
Chemistry Type
Acetoxy dual cure silicone
Solids
96.8 %
Specific Gravity
Specific gravity (SG) is the ratio of the density of a substance to the density of a reference substance; equivalently, it is the ratio of the mass of a substance to the mass of a reference substance for the same given volume. For liquids, the reference substance is almost always water (1), while for gases, it is air (1.18) at room temperature. Specific gravity is unitless.
1.05
Physical Properties
Extrusion Rate
150 to 320 g/min
Tack-Free Time
≤0.33 minutes
Chemical Properties
Water Absorption
0.28 %
Mechanical Properties
Elongation
Elongation is the process of lengthening something. It is a percentage that measures the initial, unstressed, length compared to the length of the material right before it breaks. It is commonly referred to as Ultimate Elongation or Tensile Elongation at break.
≥150 %
Electrical Properties
Volume Resistivity
Volume resistivity, also called volume resistance, bulk resistance or bulk resistivity is a thickness dependent measurement of the resistivity of a material perpendicular to the plane of the surface.
6.7×10¹⁴ Ohms⋅cm
Other Properties
Storage Temperature
8 °C to 21 °C

Additional Information

Technical properties

As-supplied / before-processing properties

PropertyValueUnitMethod / condition
AppearanceLight yellow, translucent pasteUncured; LMS
Specific gravity1.05Typical; 25 deg C
Solids/non-volatile content96.8%Typical; uncured
Aspect ratio0.85height/widthTypical; measured at 60 seconds
Flow15.2mmTypical; ISO 7390
Extrusion rate150 to 320g/minLMS; 0.6 MPa; 15 s; 25 deg C; Semco #440 nozzle
Technical properties

After-processing / final-state properties

PropertyValueUnitMethod / condition
Shore hardness32 to 48Shore ALMS; ISO 868; 70 mW/cm^2 at 365 nm for 60 s/side, then 72 h at 23 deg C/50% RH
Elongation at break>=150%LMS; ISO 37; 70 mW/cm^2 at 365 nm for 60 s/side, then 72 h at 23 deg C/50% RH
Tensile strength>=1.0N/mm^2LMS; ISO 37; 70 mW/cm^2 at 365 nm for 60 s/side, then 72 h at 23 deg C/50% RH
Tear strength8.3N/mmTypical; ISO 34-1, Die C; stated light cure plus 72 h at 23 deg C/50% RH
Volume shrinkage0.44%Typical; ASTM D 792; stated light cure plus 72 h at 23 deg C/50% RH
Dielectric breakdown strength19.1kV/mmTypical; IEC 60243-1; stated light cure plus 72 h at 23 deg C/50% RH
Volume resistivity6.7 x 10^14ohm cmTypical; IEC 60093; stated light cure plus 72 h at 23 deg C/50% RH

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