Henkel Technomelt PA 638 Black UL 94 V-0 Rated Polyamide Hot Melt Adhesive

Technomelt PA 638 Black for Low Pressure Molding and Electronics Encapsulation

Technomelt PA 638 Black is a polyamide hot melt adhesive engineered for low pressure molding and electronics encapsulation. UL 94 V-0 rated and designed to perform from -40°F to 266°F (-40°C to 130°C), it provides reliable protection in demanding electrical and industrial environments. The material forms a durable yet flexible barrier that helps protect sensitive components from vibration, impact, and environmental exposure while enabling efficient, cure-free processing.

Key Advantages of PA 638 Black for Low Pressure Molding

• UL 94 V-0 Flame Rating: Supports safety compliance requirements in electronic and electrical assemblies.
• Wide Operating Temperature Range: Performs reliably from -40°F to 266°F (-40°C to 130°C) in demanding industrial environments.
• Durable Yet Flexible Protection: Forms a resilient encapsulant that helps absorb vibration and mechanical stress without cracking.
• Optimized for Low Pressure Molding: Low-viscosity processing helps protect delicate components during encapsulation.
• Cure-Free Thermoplastic Processing: Solidifies quickly after molding to streamline production.

Specifications

• Series: Technomelt PA 638 Black
• Type: Hot Melt Adhesive
• Application: Molding
• Chemistry: Polyamide
• Components: One-Component
• Cure: Physical Setting
• Color: Black
• Application Temperature: 392 – 464°F (200 – 240°C)
• Operating Temperature Range: -40 – 266°F (-40 – 130°C)
• Softening Point: 338 – 356°F (170 – 180°C)
• Melting Viscosity:
• 5,000 cps @ 392°F (200°C)
• 2,800 – 4,000 cps @ 410°F (210°C)
• 2,900 cps @ 428°F (220°C)
• 2,300 cps @ 446°F (230°C)
• Density: 0.98 g/cm³ @ 68°F (20°C)
• Shore A Hardness: 90
• Yield Strength: 652 psi (4.5 N/mm²)
• Break Strength: 754 psi (5.2 N/mm²)
• Elongation: 300%
• Temperature Creep Resistance: 311°F (155°C)
• Low Temperature Flexibility: -22°F (-30°C)
• Glass Transition (Tg): -32.8°F (-36°C)
• Approvals: Flame Rating UL 94 V-0
• Shelf Life: 24 Months (when properly stored)