Quality Control & Technical Inspection

Quality is controlled
from raw materials to finished panels

TTPLYWOOD operates a multi-layer quality control system — not only checking finished products, but controlling from raw material sourcing throughout the entire production process and verifying all technical parameters before shipment leaves the factory.

Request Inspection Reports → View the QC process ↓

3 levelsInspection: incoming → production → finished goods

VinacontrolIndependent third-party inspection

7 key metricsTechnical parameters checked for every lot

100%Shipment lots with archived inspection records

Quality Control System

3-layer quality control —
no defect is overlooked

TTPLYWOOD's QC system follows an early-prevention principle: identify and correct issues at the source so defects are not allowed to accumulate through the production line.

Level 01 — Incoming

Incoming Raw Material Inspection

All incoming materials are inspected before entering production. Non-conforming materials are rejected or isolated separately and are never allowed to be mixed into approved lots.

✓Logs / purchased veneer: Check wood species, diameter, grain straightness, moisture content, and signs of fungal decay. Moisture samples are measured using a resistance-type meter.
✓Adhesives: Review the supplier COA (Certificate of Analysis) to confirm formaldehyde content, pH, and viscosity match the order requirements.
✓Surface film (Film Faced): Check g/m² weight, adhesion performance, and color against the required standard. Reject film that is wrinkled, torn, or out of specification.
✓Auxiliary materials & additives: Verify labeling, shelf life, and proper storage conditions. Keep receiving records linked to the production batch number.

Level 02 — In Process

In-Process Quality Control

In-process QC means real-time monitoring of operating parameters at each machine. Any deviation from the process settings is identified and corrected immediately, preventing full-lot defects before detection.

✓After veneer drying: Check veneer moisture with a pin-type meter at 3–5 random points on each sheet. Veneer above the moisture limit is re-dried before lay-up.
✓Glue spreading: Check glue spread rate by weighing panels before and after coating. Adhesive pH is checked every 2 production hours and recorded in the production log.
✓After hot pressing: Take random samples from each press cycle for preliminary surface inspection to detect blistering, localized delamination, or glue stains. Suspicious press cycles are held back for deeper inspection.
✓After sanding: Measure thickness at 5 points on each panel and check flatness using a 2-meter straightedge. Thickness deviation is recorded in the lot tracking sheet.

Level 03 — Finished Goods

Final Finished Goods Inspection

This is the final control gate before the product leaves the factory. Internal inspection is combined with independent Vinacontrol verification to ensure all parameters match the order commitment.

✓100% panel surface inspection: QC staff inspect both A and B faces under standard lighting. Panels with defects beyond the allowed tolerance (edge cracks, surface depressions, major stains) are marked and removed.
✓Dimension & thickness measurement: Check length, width, and squareness at all 4 corners. Measure thickness at 9 points (4 corners + 4 edges + center) using a vernier caliper or thickness gauge.
✓Bonding test (boil test or shear test): Representative samples from each lot are tested for bonding strength according to EN 314 or GB/T 17657. Non-conforming lots are not released for shipment.
✓Independent Vinacontrol inspection: Vinacontrol takes random samples at the warehouse and performs testing in an accredited laboratory. The inspection report is included in the shipping document package.

Technical Testing & Performance

4 categories of technical testing
performed on every export lot

Technical parameters are tested using standardized methods. Results are traceable by batch number and verified by both the internal QC team and independent inspection bodies.

🔗

Bonding Strength & Adhesive Performance Testing

This is the most critical parameter for plywood — reflecting adhesive quality, pressing performance, and resistance to delamination under real service conditions, especially in humid or high-temperature environments.

Method: EN 314-1 / GB/T 17657 Bonding Class 1: ≥ 0.8 MPa Bonding Class 2: ≥ 0.6 MPa Keo PF (WBP): ≥ 1.0 MPa

✓Boil Test (Class 3/WBP): Panel samples are boiled in water for 4 hours, dried for 20 hours at 60°C, then boiled again for 4 hours. Sliding tensile strength is then measured. The panel must show no delamination and meet the minimum MPa requirement.
✓Cold Water Soak (Class 1/2): Samples are soaked in cold water for 24 hours at 20°C, then tested by sliding tensile measurement. Applied to interior-use products.
✓Dry Shear Test: Mechanical testing under fully dry conditions. Determines the force required to separate two veneer layers, expressed in MPa. Indicates adhesive bond strength under standard conditions.

Standards: EN 314 · GB/T 17657 · ASTM D906 · JAS 2

💧

Moisture Content & Density Testing

Moisture content directly affects dimensional stability, surface quality, and the risk of warping during transport, storage, and use. Density reflects wood quality and pressing performance.

Finished panel moisture: 8 – 14% Moisture tolerance: ± 2% Density (Commercial): 500–700 kg/m³ Density (Birch): 640–720 kg/m³

✓On-site moisture measurement: Use a resistance-type (pin-type) or capacitance-type moisture meter at multiple points on the panel. This gives fast results and is suitable for line screening.
✓Oven-Dry Method: Cut a 50×50 mm specimen and weigh it before and after drying at 103±2°C until constant mass is reached. This is the standard method for official testing under EN 322.
✓Density determination: Cut a standard 50×50 mm specimen, measure dimensions accurately with a vernier caliper, and weigh it. Density = mass / volume. Evaluation depends on product group and wood species.

Standards: EN 322 · EN 323 · GB/T 17657 · ASTM D4442

⚙️

Mechanical Properties Testing

Mechanical properties determine the panel's load-bearing, bending, and compression performance — helping buyers choose the correct product for specific uses such as container flooring, formwork, furniture, or structural applications.

Bending Strength: ≥ 30 MPa Modulus of Elasticity: ≥ 5,000 MPa Internal Bond: ≥ 0.5 MPa Screw Withdrawal: ≥ 900 N

✓3-Point Bending Test: The specimen is placed on two supports and the load is applied at the center. Failure load and deflection are measured to calculate Modulus of Rupture (MOR) and Modulus of Elasticity (MOE). Testing is performed both parallel and perpendicular to the grain direction.
✓Compression Perpendicular to Grain: Measures compression resistance perpendicular to the surface, especially important for LVL and Film Faced Plywood used in formwork and container flooring.
✓Screw Withdrawal Test: Measures the force required to withdraw a screw inserted perpendicular to the panel surface. This is a key parameter for products used in furniture and mechanically fastened packaging.

Standards: EN 310 · EN 319 · EN 789 · GB/T 17657 · ASTM D3044

⏳

Durability & Service Life Evaluation

Long-term durability reflects the product's ability to maintain technical performance through real usage cycles — especially important for Film Faced Plywood used in formwork (which must be reused multiple times) and products exposed to outdoor conditions.

Film Faced reuse cycles: ≥ 8 lần Formaldehyde E0: ≤ 0.5 mg/L Formaldehyde E1: ≤ 1.5 mg/L Formaldehyde E2: ≤ 5.0 mg/L

✓Formaldehyde emission testing: Chamber method testing under EN 717-1, or perforator (EN 120) / desiccator (JIS A 1460) methods. Determines E0, E1, or E2 emission level according to adhesive type and pressing conditions.
✓Film Faced surface durability test: Simulates formwork conditions where the surface is exposed to wet cement, water, and pressure. Evaluates film separation, surface scratching, and cleanability after each use.
✓Wet/Dry cycle testing: Panel samples are subjected to repeated wetting and drying cycles. Dimensional change, warping, and surface condition are measured after each cycle to evaluate long-term stability.

Standards: EN 717 · EN 120 · JIS A 1460 · CARB Phase 2 · EPA TSCA

Technical Parameter Summary Table

Standard values by
TTPLYWOOD product group

Quick-reference table of the main technical parameters for 4 core export product groups. Actual values may vary by order depending on market requirements.

Test parameter	Packing Plywood	Film Faced Plywood	Commercial / Birch	LVL
Bonding Strength	≥ 0.6 MPa	≥ 1.0 MPa (WBP)	≥ 0.7 MPa	≥ 1.2 MPa
Bending Strength (MOR)	≥ 25 MPa	≥ 35 MPa	≥ 30 MPa	≥ 45 MPa
Modulus of Elasticity (MOE)	≥ 4,000 MPa	≥ 6,000 MPa	≥ 5,000 MPa	≥ 9,500 MPa
Finished panel moisture	8 – 14%	6 – 12%	8 – 13%	6 – 10%
Formaldehyde (standard)	E1 / E2	E0 / E1	E0 / E1	E0 / E1
Delamination (Boil Test)	Pass (Class 2)	Pass (Class 3 / WBP)	Pass (Class 2/3)	Pass (WBP)
Independent inspection	Vinacontrol	Vinacontrol	Vinacontrol / Kofpi	Vinacontrol

Need actual inspection reports for a specific shipment lot?

TTPLYWOOD provides complete Vinacontrol reports, internal QC records, and technical datasheets according to each order and import market requirement.

Request Technical Documents →

Quality Control

Quality is controlled
from raw materials to finished panels