Product Name
Permabond Urethane PT328 Medium Set 15 - 20 min 50ml and 400ml Cartridge and Starter Kit
Brief Description
Permabond PT328 is a two-part, room temperature curing polyurethane adhesive designed for industrial use. It offers a medium set time of 15-20 minutes, making it suitable for applications requiring a longer working life or covering larger areas. This adhesive forms durable, tough bonds with excellent adhesion to a wide range of substrates, including metals, plastics, and composites, while providing good resistance to impact, vibration, and various chemicals.
Popular Applications & Uses
- Bonding a wide variety of substrate materials including metals, plastics, and composites.- Structural assembly in various manufacturing processes.- Construction applications, such as bonding subflooring, carpentry, and laminates.- Automotive and specialty vehicle assembly for bonding components and windscreens.- Furniture production and joining wooden components.- Production of multi-layer packaging.- Applications requiring resistance to impact, vibration, and chemicals.
Industries that Commonly Use It
- Automotive Service/Repair- Cabinet & Woodworking- Chemical Industry- Construction/ Building Services- Flooring Installer or Manufacturer- Furniture- General Manufacturing- Metal Fabrication- Packaging Services or Contractor- Plastic Fabrication- Transportation/ Specialty Vehicle
Special and Unique Features
- Two-part, room temperature curing polyurethane adhesive.- Medium set time/long pot life of 15-20 minutes, suitable for larger areas.- Thixotropic, non-slump rheology, allowing for application without sagging.- Easy 1:1 mix ratio by volume.- Excellent environmental and chemical resistance.- Good resistance to impact and vibration.
Key Properties
- Chemical composition: Polyurethane, Isocyanate.- Appearance: Black / Amber (uncured components).- Mix Ratio: 1:1 by volume.- Pot life / Work time: 15-20 minutes.- Fixture/Handling Strength Time: 90 to 120 minutes.- Full Cure Time: 4-5 days at room temperature (can be accelerated with heat).- Viscosity: 2000-8000 mPas (Part A) / 3000-9000 mPa.s (Part B).- Max. Gap Fill: 5 mm.- Shear Strength: 11-16 MPa (700-900 psi to 1700-2600 psi depending on substrate and conditions).- Tensile Strength: 10-20 MPa (2200-2900 psi).- Elongation: 10-20% (<20%).- Hardness: 68 Shore D (60-75 Shore D).- Service Temperature: -40°C to +120°C (-40°F to +248°F).
Surface Compatibility
- Metals (e.g., aluminum, copper, mild steel).- Plastics.- Composites.- Wood.- Concrete.- Glass.- Ceramics.- Rubber.- Note: Compatibility with some thermoplastics should be checked. Surfaces should be clean, dry, and grease-free; light abrasion may benefit some metals.
Known backups / known substitutes
- Structural Polyurethane Alternatives: Epoxy adhesives and Acrylic adhesives (also known as methyl methacrylate adhesives). These offer high strength, resistance to impact and vibration, and can withstand harsh environments.- Semi-structural/Sealant Polyurethane Alternatives: Silicone sealants and MS Polymer sealants. These provide flexible bonds, good temperature and weathering resistance, and can match or exceed polyurethane sealant performance.- Polyurea adhesives are emerging as a fast-curing structural alternative, particularly in vehicle assembly.- Other Permabond polyurethane grades like PT321 (faster, strong) and PT326 (moderate pot life) are also available.
Comparison Note
Permabond PT328 is a two-part polyurethane adhesive offering a balance of good working time (15-20 min pot life) and strong, durable bonds with excellent environmental and chemical resistance. Compared to faster-setting polyurethanes, its medium set allows for more complex assemblies or larger area coverage. When considering alternatives, epoxies and acrylics generally offer higher structural strength, while silicones and MS polymers are better for flexible sealing applications. The choice depends on specific application requirements, cure time needs, and substrate compatibility.
