SATRA TESTING LAB & QUALITY ASSURANCE

ASTM F2913 / SATRA TM144

Measures the coefficient of friction of rubber outsoles against competition vinyl wrestling mats under 500 N downward loads in forward, backward, and rotational directions. Required standard ≥ 0.50; SDTDID achieves 0.68–0.72.

SATRA TM133 (Refrigerated -5°C)

Simulates 100,000 full stride flexes in a chilled chamber to verify that rubber compounds do not suffer cold embrittlement or crack growth > 4.0mm along forefoot flex grooves.

ISO 17708 / SATRA TM411

Tensile testing clamps separate upper microfiber and outsole rubber at 100 mm/min. Industry threshold is ≥ 3.5 N/mm; SDTDID's waterborne primer cementing delivers 4.2 to 4.8 N/mm.

ISO 4649 / DIN 53516

Rubber specimens are dragged across a rotating abrasive drum over a 40-meter path. Volumetric loss must remain ≤ 150 mm³; SDTDID gum rubber averages 118 mm³.

ISO 12947-2 (Martindale Test)

Collar tricot and insole fabrics are subjected to continuous multidirectional friction rubs under 12 kPa pressure. Our lining exceeds 51,200 dry cycles without fiber pilling or hole formation.

EU REACH SVHC & US CPSIA

Screened for heavy metals (Lead < 90 ppm, Cadmium < 100 ppm), 8P Phthalates (< 0.1%), azo dyes, and organotin compounds. Certified safe for international sports retail.

100% Inspección Final por el Director General

In traditional contract footwear factories, QC ends with AQL 2.5 random sampling—meaning defective pairs still slip through into customer containers.

At SDTDID, our Chairman personally oversees and executes a mandatory 100% final station inspection on every single shoe coming off the lasting line before it is wrapped in tissue and cartoned:

• Full perimeter cement bond examination (no adhesive overflow or gaps)
• Symmetry verification between left and right shoe collar heights
• Lace garage elastic tension and alignment check
• Heel counter stability check (no collapsing under thumb pressure)
• Cleanliness audit and zero-residue check prior to barcode tagging

Social & Ethical Factory Auditorías

Our Jinjiang manufacturing headquarters operates with full transparency and verified social responsibility credentials:

What physical testing equipment is housed in SDTDID's Jinjiang laboratory?

Our facility houses SATRA calibrated machines including: 1) Bally flex endurance testers (-10°C refrigerated and ambient); 2) Computerized tensile peel testers for ISO 17708 sole adhesion; 3) Martindale abrasion machines for linings; 4) DIN 53516 rotary drum rubber abrasion testers; 5) Electronic DCoF slip-resistance rigs; 6) UV aging resistance test chambers.

What is Chairman 100% Final Inspection?

Unlike sampling inspections (AQL 2.5), our Chairman personally audits and signs off on every finished production run prior to packing. 12 critical checkpoints are examined: sole bonding seam perimeter, symmetry of high-frequency logos, lace garage stitching tension, heel counter rigidity, and sizing label accuracy.

What international social and ethical factory audits does SDTDID hold?

Our factory maintains valid amfori BSCI (Social Compliance) and Sedex SMETA 4-Pillar (Labor Standards, Health & Safety, Environment, Business Ethics) audits. Full audit reports and SEDEX reference numbers are shared with prospective B2B clients under NDA.

How do you ensure chemical safety for US and European retail markets?

Every material roll (microfiber, rubber, adhesives, eyelets) undergoes chemical screening for EU REACH SVHC (< 0.1% w/w), US CPSIA (Lead < 90 ppm, Phthalates < 1000 ppm), and California Proposition 65.

Request Factory Direct Specification & Sample Quote

Direct response from Jinjiang engineering desk within 8 hours. PPS samples dispatched in 7–10 days.