Automotive Interior – Polyurethane Adhesive

1. Core CharacteristicsTable 1: Basic Physical PropertiesParameterSpecification RangeTest

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Content

1. Core Characteristics

Table 1: Basic Physical Properties

Parameter	Specification Range	Test Method
Viscosity (25°C)	3.000-50.000 cP	Brookfield
Cure Time (min)	5-120	ASTM D2471
Tensile Strength	5-15 MPa	ISO 527
Elongation	150-600%	ISO 527
Peel Strength	4-8 N/mm	ASTM D1876
Service Temp	-40°C to +120°C	ISO 6722
Density	1.05-1.25 g/cm³	ASTM D792

2. Application-Specific Formulations

Table 2: Adhesive Types by Interior Component

Component	Adhesive Type	Key Requirements
Headliners	Low-odor 1K PU	Minimal VOC, high tack
Door Panels	2K structural PU	High strength, fast cure
Dashboards	Elastic PU	Vibration damping
Seat Covers	Sprayable PU	Flame retardant
Carpets	Water-based PU	Low temperature cure
Trim Parts	Instant-grab PU	Repositionable

3. Performance Comparison

Table 3: PU vs Alternative Interior Adhesives

Property	PU Adhesive	Hot Melt	Epoxy	Acrylic
Flexibility	★★★★★	★★	★	★★★
Vibration Resistance	★★★★★	★★★	★★	★★★★
Gap Filling	★★★★	★	★★★	★★
Temperature Range	★★★★	★★	★★★	★★★
Substrate Versatility	★★★★★	★★★	★★★★	★★★★
Cure Speed	★★★	★★★★★	★★★★	★★★★

4. Manufacturing Requirements

Surface Preparation:

Plasma treatment for plastics
Solvent wiping for metals
Light abrasion for textiles

Application Methods:

Robotic dispensing
Roll coating
Spray application
Bead extrusion

Curing Conditions:

Temperature: 20-80°C
Humidity: 40-70% RH
Pressure: 0.1-0.5 MPa

5. Automotive Standards Compliance

Standard	Requirement	PU Adhesive Performance
ISO 6722	Temperature resistance	Exceeds requirements
SAE J2230	Fogging test	<2mg (Class A)
VDA 270	Odor testing	Score 3-4
FMVSS 302	Flammability	Self-extinguishing
ELV Directive	Heavy metals	Fully compliant

6. Recent Technological Advances

Low-VOC formulations meeting global emission standards
Fast-cure systems for production line efficiency
Thermal-conductive grades for EV battery components
Self-healing versions for long-term durability
Bio-based polyols for sustainable solutions

7. Processing Guidelines

Parameter	Optimal Range
Pot Life	10-90 minutes
Open Time	1-15 minutes
Clamping Pressure	0.05-0.3 MPa
Fixture Time	2-30 minutes
Full Cure	6-48 hours
Recoat Window	30-120 minutes

8. Failure Prevention

Common Issues:

Bubble formation (control humidity)
Poor wetting (ensure surface energy >36 dynes/cm)
Delamination (verify substrate compatibility)
Cure inhibition (avoid silicone contamination)

Quality Control Measures:

Rheology testing
FTIR verification
Lap shear testing
Accelerated aging tests

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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