1. Executive Summary Borderline quality in birch plywood refers to defects that fall at the threshold of national standards (GB/T 9846-2015) and client-specific specifications, representing the most contentious zone in international trade and quality control. This report systematically categorizes common borderline scenarios across four dimensions—appearance, physiochemical properties, dimensional tolerance, and manufacturing process—providing clear judgment criteria and practical inspection methods tailored …

As of March 22, 2026, our statistics show that the number of birch plywood manufacturing mills in Southeast Asia and Africa has increased from 22 recorded on December 25, 2025, to the current total of 48 production mills (excluding pure trading companies). Thailand: 15 manufacturing mills Cambodia: 6 manufacturing mills Malaysia: 12 manufacturing mills (East Malaysia & West Malaysia) Laos: …

I. Precise Classification (3 Core Dimensions, Universal for QC Filing) 1. By Defect Location (Easiest On-Site Identification) Core Interlayer Delamination/Blistering: Most common; separation at veneer-to-veneer bonding interface with varying areas Core-to-Face/Back Transition Layer Delamination: Critical stress-bearing zone, prone to extended cracking and structural strength reduction Local Spot Delamination: Small-area single-point hollowing, mostly isolated process flaws 2. By Visual Morphology (Visual …