QUALITY INSPECTION REPORT – WHITE PRIMED MDF MOLDINGS
1. Basic Information
Item
Details
Product Name
White Primed MDF Moldings (木线条)
Thickness
12mm / 15mm / 18mm (Customizable)
Width
50mm / 60mm / 80mm (Customizable)
Length
2400mm / 2700mm / 3000mm
Primer Type
Water-based acrylic primer
Surface Finish
Smooth, ready for painting
2. Raw Materials & Certifications
Material
Specification
Certifications
MDF Core
E1/E0 Grade, Density 680-800 kg/m³
CARB P2, FSC, CE, EN 622-5
Primer Coating
Low VOC, formaldehyde-free
SGS, EPA TSCA Title VI, REACH
Adhesive
UF/MDI (Isocyanate-based)
EN 314-2, JIS K 6806
Additives
Fire retardant (if applicable)
BS 476, ASTM E84 Class A/B
3. Common Defects & Inspection Criteria
A. Visual & Processing Defects
Defect Type
Acceptance Criteria
Remarks
Surface Scratches
≤2 minor scratches (<1mm depth)
Reject if visible after priming
Edge Chipping
Not allowed
CNC cutting tolerance ±0.3mm
Primer Bubbles
≤3 bubbles per 1m length
Sanding required if excessive
Warping/Twisting
≤1mm deviation over 1m length
Check humidity exposure
Sanding Marks
No visible grit marks (≥220 grit)
Re-polish if needed
B. Functional Defects
Defect Type
Test Method
Acceptance Standard
Delamination
Boil Test (2h in water)
No swelling/layer separation
Paint Adhesion
Cross-cut test (ISO 2409)
Class 0-1 (no peeling)
Moisture Resistance
24h immersion at 20°C
Swelling ≤8% (EN 317)
4. Laboratory Test Data
Test Item
Test Standard
Result
Requirement
Density
EN 323
720 kg/m³
650-850 kg/m³
Moisture Content
EN 322
6.5%
5-9%
Formaldehyde Emission
EN 717-1 (Chamber Method)
0.05 ppm (E0 Grade)
≤0.1 ppm (E0)
Bending Strength
EN 310
32 MPa
≥30 MPa
Screw Holding Capacity
EN 320
1,100 N
≥900 N
Fire Resistance
ASTM E84
Flame Spread: Class B (FSI ≤75)
As per project specs
5. Production Process
Step
Description
Key Parameters
1. MDF Board Cutting
CNC precision cutting
Tolerance ±0.2mm
2. Edge Milling
Router shaping (ogee, round, etc.)
Profile accuracy ±0.1mm
3. Sanding
180-220 grit abrasive belts
Ra ≤3.2 µm (smoothness)
4. Primer Coating
Spray/pressure roller application
Dry film thickness: 60-80µm
5. Curing
UV/air drying
24h at 20°C, RH 50%
6. Quality Inspection
Visual + lab sampling
AQL 1.0 (Major defects)
6. Jointing Methods
Method
Description
Application
Butt Joint
Simple end-to-end connection
Low-stress areas (e.g., trim)
Miter Joint
45° angle cut for corners
Frame/crown molding
Biscuit Joint
Oval-shaped wood biscuit + glue
Long-length splicing
Spline Joint
Groove + insert strip (MDF/PVC)
High-strength joints
7. Conclusion
The White Primed MDF Moldings meet E0 environmental standards and exhibit excellent dimensional stability, paint adhesion, and mechanical strength. Recommended for interior decorative applications (e.g., skirting, door frames, paneling).
