Permabond TA439 Toughened Acrylic Adhesive 2-Part, No-Mix

PERMABOND® TA439 is a two component structural acrylic adhesive designed primarily for bonding metals, ferrites, ceramics and some plastics. The typical fixture time of is 20-40 seconds. The fast fixture time of TA439 makes it an ideal adhesive for high speed production lines. This product provides high strength, tough, durable bonds with good impact resistance and performs well in drop tests. TA439 is methacrylic acid free, this means it is suitable for use on sealed electric motors and will not cause corrosion to sensitive components.
Use TA439 with Initiator 41 (or Initiator 43 for use on plastics).

Features

• Adhesion to a wide variety of substrates
• Fast cure at room temperature
• No mix application
• High shear and peel strength
• Good impact strength
• Good chemical resistance
• Non-corrosive formulation

Physical Properties of Uncured Adhesive

• Chemical composition: Urethane methacrylate
• Appearance: Transparent amber liquid
• Viscosity @ 25°C: 20 rpm: 600-1,200 mPa.s (cP)
• Specific gravity (resin): 1.0

Typical Curing Properties (with Initiator 41)

• Ratio of use: 10:1.5 approximately
• Maximum gap fill: 0.15 mm (0.006 in)
• Fixture time (mild steel) @23°C: No gap: 20-40 secs
• Handling time (mild steel) (0.3 N/mm² shear strength is achieved) @23°C: No gap: 40-75 secs
• Working strength (mild steel) @23°C: No gap: 3-5 mins
• Full cure @23°C: 24 hours

Typical Performance of Cured Adhesive

• Shear strength (ISO4587)*: Mild steel: 20-25 N/mm² (2900-3600 psi)
  Zinc: 12-18 N/mm² (1700-2600 psi)
• Shear strength (steel to ferrite): After 3 minutes: 4 N/mm² (600 psi)
  After 24 hours: >14 N/mm² (>2000 psi) (substrate failure)
• Peel strength (aluminium) (ISO 4578): 85-100 N/25mm (18-22 PIW)
• Tensile strength (ISO37): 25-30N/mm² (3600-4200 psi)
• Impact strength (ASTM D-950): 15-20 kJ/m²
• Coefficient of thermal expansion (ASTM D-696): 80 x 10-6 1/K
• Thermal conductivity (ASTM C-177): 0.1 W/(m.K)
• Dielectric constant (ASTM D-150): 4.6
• Dielectric strength (ASTM D-149): 30-50 kV/mm
• Volume resistivity (ASTM D-257): 2 x 10 13 Ohm.cm

Surface Preparation

Surfaces should be clean, dry and grease-free before applying the adhesive. Permabond Cleaner A is recommended for the degreasing of most surfaces. Some metals such as aluminium, copper and its alloys will benefit from light abrasion with emery cloth (or similar), to remove the oxide layer.

Directions for Use

1) Surfaces must be clean, dry and grease-free. Apply Initiator 41 to one surface (or Initiator 43 for use on plastics).
2) Apply adhesive to the other surface.
3) Assemble the components using sufficient force to spread the adhesive thinly. Parts should be bonded immediately and within a maximum of two hours of applying the Initiator.
4) Maintain pressure until handling strength is achieved. The time required will vary according to the joint design, gap and surfaces being bonded.
5) Allow 24 hours for adhesive to fully cure. Accelerated cure times may be achieved by heating.