PERMABOND TA4820
Harmonization Code : 3403.19 | Lubricating Preparations (With 70% or More Petroleum Oils) For Automotive and Other Uses
Main features
- Extended 10-15 Minute Pot Life
- Thixotropic 2 mm Gap Filling
- High Peel Strength with Cured Elongation
Product Description
Permabond TA4820 is a two-component 1:1 toughened methacrylate structural adhesive for thermoplastics, thermosets, metals and composites. At 23 deg C, pot life is 10-15 minutes, fixture time is 25-35 minutes and handling strength is reached in 45-60 minutes. The thixotropic adhesive fills gaps up to 2 mm and can be dispensed through a static mixer. After cure, typical lap-shear strength is 21-28 N/mm2 on steel and 17-24 N/mm2 on aluminum. Typical peel strength is 70-90 N/25 mm, and cured elongation is 15-20%.
Key features
- 10-15 minute pot life: Pot life is 10-15 minutes at 23 deg C, followed by 25-35 minute fixture time.
- Thixotropic 2 mm gap filling: The 1:1 adhesive fills gaps up to 2 mm and can be dispensed through a static mixer.
- Peel strength with cured elongation: Typical peel strength is 70-90 N/25 mm to ISO 4578 and cured elongation is 15-20% to ISO 37.
Applications
Structural bonding of thermoplastics, thermosets, metals and composites.
TDS, SDS & Technical Documents
Technical Specifications
General Properties
Appearance
Off-white/Amber
Appearance at room temperature.
Chemistry Type
Methyl methacrylate
Specific Gravity
1.0
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
200,000-300,000/120,000-200,000 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
Mechanical Properties
Elongation
15 - 20 %
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.
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 viscosity | 200,000-300,000 | cP | 25 deg C |
| Part B viscosity | 120,000-200,000 | cP | 25 deg C |
| Mix ratio | 1:1 | - | Part A : Part B |
| Maximum gap fill | 2 | mm | Mixed adhesive |
| Pot life | 10-15 | min | 10 g + 10 g mixed mass; 23 deg C |
Technical properties
After-processing / final-state properties
| Property | Value | Unit | Method / condition |
|---|---|---|---|
| Lap-shear strength | 21-28 | N/mm2 | Typical cured joint; steel; ISO 4587 |
| Lap-shear strength | 17-24 | N/mm2 | Typical cured joint; aluminum; ISO 4587 |
| Peel strength | 70-90 | N/25 mm | Typical cured joint; ISO 4578 |
| Tensile strength | 29 | N/mm2 | Typical cured adhesive; ISO 37 |
| Elongation | 15-20 | % | Typical cured adhesive; ISO 37 |
