DOWSIL HM-2520

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

DOWSIL HM-2520

Main features

  • Immediate Handling Before Moisture Cure
  • 15-Minute Open Time
  • 1000% Cured Elongation

Product Description

DOW CORNING HM-2520 Assembly Sealant is a one-part hot-melt silicone assembly sealant that develops immediate handling strength after application and then moisture cures. Typical processing properties include a 15-minute open time, 24-hour pot life, approximately 1100 poise viscosity at 120 deg C, and 98.5% nonvolatile content. In the cured state, typical tensile strength is 700 psi with 1000% elongation, and the service-temperature range is approximately -45 to 150 deg C. The material is used for assembly sealing and bonding where hot-melt application and subsequent moisture cure are required.

Key features

  • Immediate Handling Strength: Hot-melt application provides handling strength before the subsequent moisture cure.
  • 15-Minute Open Time: Pot life is also listed at 24 hours.
  • 1000% Cured Elongation: Typical cured tensile strength is 700 psi.

Applications

Assembly sealing and bonding where hot-melt application provides immediate handling strength followed by moisture cure.

Product Family

DOWSIL HM-2520

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TDS, SDS & Technical Documents

Technical Specifications

Physical Properties
Open time
15 minutes
Viscosity
Viscosity is a measurement of a fluid’s resistance to flow. Viscosity is commonly measured in centiPoise (cP). One cP is defined as the viscosity of water and all other viscosities are derived from this base. MPa is another common unit with a 1:1 conversion to cP. A product like honey would have a much higher viscosity -around 10,000 cPs- compared to water. As a result, honey would flow much slower out of a tipped glass than water would. The viscosity of a material can be decreased with an increase in temperature in order to better suit an application
110,000 mPa.s
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.
1000 %
General Properties
Appearance
Appearance at room temperature.
Translucent
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.
1.12
Thermal Properties
Service temperature
-45 to 150 °C

Additional Information

Technical properties

As-supplied / before-processing properties

PropertyValueUnitMethod / condition
ViscosityApprox. 1100poise120 deg C; typical
Nonvolatile content98.5%Typical
Open time15minTypical
Pot life24hTypical
Specific gravity1.12-Uncured; typical
Technical properties

After-processing / final-state properties

PropertyValueUnitMethod / condition
Tensile strength700psiTypical
Elongation1000%Typical
Service temperature rangeApprox. -45 to 150deg CTypical

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