Automotive Interior – Reactive Polyurethane Hot Melt Adhesive (PUR)

1. Fundamental PropertiesTable 1: Typical Technical SpecificationsParameterSpecification R

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1. Fundamental Properties

Table 1: Typical Technical Specifications

Parameter	Specification Range	Test Method
Application Temperature	110-140°C	ASTM D3236
Open Time	30-180 seconds	ISO 11343
Tensile Strength	8-20 MPa	ISO 527
Elongation at Break	200-500%	ISO 527
Peel Strength (Textile/Substrate)	6-12 N/mm	DIN 53282
Viscosity @ 120°C	5.000-25.000 mPa·s	ASTM D3236
Density	1.10-1.25 g/cm³	ISO 1183
Moisture Cure Time (24h)	70-90% final strength	-

2. Application Matrix

Table 2: Automotive Interior Applications by Component

Component	Bonding Requirements	PUR Advantages
Headliners	Lightweight bonding, sag resistance	Excellent initial grab
Door Panels	Structural integrity, vibration damping	High fatigue resistance
Seat Assemblies	Foam-to-fabric bonding	Penetration control
Instrument Panels	Multi-material bonding	Thermal stability
Acoustic Insulation	Porous material adhesion	Deep fiber anchoring
Decorative Trims	Precision application	Clean processing

3. Performance Comparison

Table 3: PUR vs Conventional Automotive Adhesives

Characteristic	Reactive PUR HM	EVA Hot Melt	Solvent-based PU	Acrylic PSA
Initial Tack	★★★★	★★★★★	★★	★★★★★
Final Strength	★★★★★	★★	★★★★	★★★
Heat Resistance	★★★★☆ (150°C)	★★ (80°C)	★★★★ (120°C)	★★ (70°C)
Vibration Damping	★★★★★	★★	★★★★	★★★
Curing Mechanism	Moisture	Physical	Chemical	Physical
VOC Emission	<50g/L	<20g/L	300-600g/L	<5g/L
Substrate Versatility	★★★★★	★★★	★★★★	★★★★

4. Processing Parameters

Application Equipment:

Temperature-controlled melt tanks (110-140°C)
Gear pump delivery systems
Programmable robotic applicators
Slot/nozzle sizes: 0.3-2.0mm

Optimal Conditions:

Substrate temperature: 15-40°C
Ambient RH: 30-70%
Compression time: 10-60 seconds
Pressure: 0.1-0.3 MPa

5. Material Compatibility

Substrate Type	Surface Preparation	Bond Strength Rating
PP/EPDM	Flame treatment	★★★☆
ABS/PC	Solvent wipe	★★★★★
Polyurethane Foam	None required	★★★★★
Nylon Fabrics	None required	★★★★☆
Aluminum	Abrasion + cleaning	★★★★
Leather	Mechanical abrasion	★★★★☆

6. Quality Control Standards

Requirement	Test Method	Target Value
Heat Aging (120°C/1000h)	ISO 188	≤20% strength loss
Cold Flexibility (-40°C)	DIN 53122	No cracking
Fogging Test	SAE J1756	<3mg
Odor Evaluation	VDA 270	≤3.5 rating
Flammability	FMVSS 302	Self-extinguishing

7. Advantages & Limitations

Advantages:

100% solids content (no solvents)
Immediate handling strength
Excellent gap-filling properties
Resistance to oils and plasticizers
Reformable before full cure
Meets automotive VOC requirements

Limitations:

Requires moisture for full cure
Specialized application equipment
Limited open time control
Higher raw material cost
Thermal degradation >180°C

8. Industry Trends

Next-Gen Developments:

Faster-curing formulations (90% cure in 4h)
Lower application temperatures (95-120°C)
Bio-based polyol content (>30%)
Enhanced adhesion to untreated plastics
Smart color-change indicators

Disclaimer: The above content is for reference and communication only among industry insiders, and does not guarantee its accuracy or completeness. According to relevant laws and regulations and the regulations of this website, units or individuals who purchase related items should obtain valid qualifications and qualification conditions.

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