Laminated Flooring Quality Checklist and Grading Rules
1. Scope
This document specifies quality check items, acceptance criteria, and grading rules for laminated flooring (laminate wood flooring), complying with EN 13329 and GB/T 18102-2020. It covers raw material inspection, in-process quality control, finished product testing, and A/B/C grading standards.
2. Quality Checklist
2.1 Raw Material & Structural Inspection
表格
| Check Item | Standard Requirement | Inspection Method |
|---|---|---|
| Wear Layer (Overlay) | ≥45 g/m² aluminum oxide; thickness ≥0.3 mm | Cross-section measurement; supplier test report |
| Decor Layer | Clear grain, color uniformity, no fading; EIR (Embossed in Register) preferred | Visual check; color difference meter |
| Core (HDF) | Density ≥850 kg/m³; moisture content 6–10% | Density tester; oven drying method |
| Balance Layer | Flat, no warping; moisture-proof coating intact | Visual check |
| Locking System | 5G/Uniclic/Megaloc; tight fit, no gap | Assembly test; feel check |
2.2 Dimensional Accuracy
表格
| Check Item | Tolerance | Inspection Method |
|---|---|---|
| Length | ±0.1 mm | Vernier caliper |
| Width | ±0.05 mm | Vernier caliper |
| Thickness | ±0.1 mm | Micrometer |
| Straightness | ≤0.3 mm/m | Straightedge |
| Squareness | ≤0.2 mm/side | Square ruler |
2.3 Appearance Quality
- Surface: No scratches, dents, bubbles, stains, or gloss unevenness.
- Edges: No chipping, cracking, or damage; consistent bevel.
- Color & Grain: No obvious color difference within 5 boards; grain pattern consistent.
- Texture: Embossing matches decor layer (EIR).
2.4 Physical & Mechanical Performance
表格
| Test Item | Requirement (Residential/Commercial) | Test Standard |
|---|---|---|
| Surface Abrasion (AC Rating) | AC3 ≥4,000 rev; AC4 ≥6,000 rev; AC5 ≥9,000 rev | EN 13329; Taber tester |
| Impact Resistance | 1 kg steel ball, 500 mm drop; no crack, dent ≤10 mm | GB/T 17657 |
| Thickness Swelling | ≤2.5% (24 h water soak); commercial ≤2.0% | EN 13329 |
| Static Bending Strength | ≥30 MPa (longitudinal); ≥20 MPa (transverse) | GB/T 17657 |
| Internal Bond Strength | ≥1.0 MPa | GB/T 17657 |
| Formaldehyde Emission | E0 ≤0.05 mg/m³; ENF ≤0.025 mg/m³ | EN 717-1 |
2.5 Water & Moisture Resistance
- Edge Seal: No water penetration after 30 min water spray.
- Warping: ≤2 mm/m after 4 h at 85% RH.
2.6 Environmental Safety
- Formaldehyde: Meet E0/ENF; CARB Phase 2 compliant.
- Volatile Compounds: Low VOC; meet indoor air quality standards.
3. Grading Rules
3.1 Grade A (Premium)
- Appearance: Zero defects; perfect surface, edges, color, and grain.
- Performance: All test items meet top standards (AC5, ENF, swelling ≤2.0%).
- Application: High-end residential, luxury commercial spaces.
3.2 Grade B (Standard)
- Appearance: Minor, non-visible defects (e.g., tiny color variation, slight texture inconsistency); no functional impact.
- Performance: Meet basic standards (AC3/AC4, E0, swelling ≤2.5%).
- Application: General residential, light commercial.
3.3 Grade C (Economy)
- Appearance: Visible but non-structural defects (e.g., small scratches, minor edge chipping); no effect on installation or durability.
- Performance: Meet minimum industry standards (AC3, E1, swelling ≤3.0%).
- Application: Rental properties, temporary spaces, secondary areas.
3.4 Rejected (Scrap)
- Any of the following:
- Structural damage (crack, delamination, severe warping).
- Critical performance failure (abrasion <4,000 rev, swelling >3.0%, formaldehyde >E1).
- Severe appearance defects (large scratch, bubble, color mismatch).
4. Sampling & Inspection Procedure
- Batch Sampling: 3–5 boards per 500 m²; random selection.
- Visual Check: 100% appearance inspection for Grade A/B; spot-check for Grade C.
- Lab Testing: 1 sample per batch for abrasion, swelling, formaldehyde.
- Grading Decision: Based on worst defect; e.g., a board with Grade A appearance but Grade B performance is graded B.
5. Marking & Traceability
- Each board labeled with grade, AC rating, production date, batch number.
- Grade A: Green mark; Grade B: Blue mark; Grade C: Yellow mark.
