PERMABOND TA440
Harmonization Code : 3910.00.00.90 | Silicones in Primary Forms; Others
Main features
- Rapid 1:1 Structural Acrylic Bonding
- 15-30 Second Fixture on Zinc
- High Shear, Peel and Impact Strength
Product Description
Permabond TA440 is a two-component 1:1 structural acrylic adhesive for metals, glass, wood, ferrites, ceramics and selected rigid plastics. TA440A and TA440B can be applied to opposing surfaces or dispensed bead-on-bead so the two components combine during assembly. On zinc at 23 deg C, typical fixture time is 15-30 seconds and handling strength is reached in 60-90 seconds. After cure, typical mild-steel lap-shear strength is 15-25 N/mm2. Typical peel strength is 45-65 N/25 mm to ISO 4578, while impact strength is 10-15 kJ/m2 to ASTM D-950.
Key features
- 1:1 bead-on-bead or opposing-surface application: TA440A and TA440B are used at a 1:1 ratio and can combine as the parts are assembled.
- 15-30 second fixture on zinc: Typical fixture time is 15-30 seconds at 23 deg C, with handling strength in 60-90 seconds.
- Cured peel and impact resistance: Typical peel strength is 45-65 N/25 mm to ISO 4578 and impact strength is 10-15 kJ/m2 to ASTM D-950.
Applications
Structural bonding of metals, glass, wood, ferrites and ceramics; bonding selected rigid plastics.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Chemistry Type
Urethane methacrylate
Color
Amber /Green
The color
Specific Gravity
1.1
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.
Physical Properties
Viscosity
5,000 12,000 mPa.s
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
Thermal Properties
Thermal Conductivity
0.1 W/m.K
Thermal conductivity describes the ability of a material to conduct heat. It is required by power packages in order to dissipate heat and maintain stable electrical performance.
Thermal conductivity units are [W/(m K)] in the SI system and [Btu/(hr ft °F)] in the Imperial system.
Electrical Properties
Dielectric Strength
30 - 50 kV/mm
Dielectric strength is measured in kV per mm and is calculated by the Breakdown voltage divided by the thickness of the tested material.
Those two properties go hand in hand and while Breakdown voltage is always thickness dependent, dielectric strength is a general material property.
As an example, the dielectric strength of Polyimide is 236 kV/mm. If we place 1mm of Polyimide between two electrodes, it will act as an insulator until the voltage between the electrodes reaches 236 kV. At this point it will start acting as a good conductor, causing sparks, potential punctures and current flow.
Additional Information
Technical properties
As-supplied / before-processing properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Part A chemical composition | Urethane methacrylate | - | Uncured Part A |
| Part B chemical composition | Urethane methacrylate | - | Uncured Part B |
| Part A viscosity at 20 rpm | 5,000-12,000 | cP | 25 deg C |
| Part B viscosity at 20 rpm | 5,000-12,000 | cP | 25 deg C |
| Mix ratio | 1:1 | - | Part A : Part B |
Technical properties
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Lap-shear strength | 15-25 | N/mm2 | Typical cured joint; mild steel; ISO 4587 |
| Peel strength | 45-65 | N/25 mm | Typical cured joint; ISO 4578 |
| Tensile strength | 25 | N/mm2 | Typical cured adhesive; ISO 37 |
| Impact strength | 10-15 | kJ/m2 | Typical cured adhesive; ASTM D-950 |
