Engineering Specifications & ASTM / SATRA Lab Metrics
Every production batch of DJ-MDR-7840 is compounded and hot-molded in our Jinjiang facility, subject to rigorous testing in our in-house SATRA-standard laboratory. Below are verified engineering parameters:
| SKU Identifier | DJ-MDR-7840 |
|---|---|
| Category | Rugged Trail & Tactical |
| Durometer Hardness | Midsole Shore 48°C / Tread Shore 62°A (Precision calibrated via Shore Durometer Type A/C) |
| Cold-Flex Durability | SATRA TM161: >80,000 cycles at -15°C |
| DIN 53516 Abrasion | DIN 53516: < 88 mm³ (Volume Loss Under 10N Normal Force) |
| Slip Resistance | SATRA TM144: Wet Ceramic CoF > 0.49 |
| Polymer Formulation | Injection Phylon (MD) + High-Grip Synthetic SBR Rubber Shell |
| Available Size Curve | EU 37 – 46 (US 5 – 12) |
| Unit Weight (EU 42) | 245g / pc (EU 42) |
| Stack Height & Drop | Heel 34mm / Forefoot 24mm (10mm Drop) |
| Intellectual Property | CN214157832U · Dual-Density Flex Sole |
| Export Tariff Classification | HS Code 6406.20.00 (Outsoles & Parts of Footwear) — 3.0% MFN Duty vs 37.5% Finished Shoes |
Polymer Science & Mold Structural Design
The geometry of DJ-MDR-7840 incorporates Dingjian's patented anti-stress concentration groove pattern. During human gait propulsion, ground shear stress is evenly distributed across the midfoot flex channels, preventing the micro-fractures common in lower-grade commercial outsoles.
The surface is pre-treated with our proprietary plasma corona discharge and priming system, ensuring high-strength bonding with PU/EVA midsoles, strobel boards, and cement-lasting uppers without manual solvent sanding.
🧪 Quality Assurance Guarantee
Dingjian guarantees that all shipments of DJ-MDR-7840 maintain strict DIN 53516 abrasion resistance, SATRA TM161 cold crack resistance down to -20°C, and CIELAB color consistency (dE < 0.8). If any batch fails SATRA third-party testing, we provide a 100% full batch remold or credit guarantee.
