Quality Certification
International Certifications
Certified by multiple international authorities to meet global quality standards.
LWG Certified
Leather Working Group
Our leather has earned the stringent international LWG certification, one of the industry's top standards for environmental sustainability. This marks our environmental management performance as a global leader.
Ecotan Certification
Italy Silvateam metal-free tanning process
Ecotan is an innovative, metal-free tanning process developed by Silvateam in Italy. It represents the perfect balance of sustainability and performance, emphasizing a circular philosophy: born from nature, returned to nature.
Core advantages of full-grain vegetable-tanned leather
Zhenglong 3.0 Full-Grain Leather: Where "Zero-Chromium Eco-Friendly" and "Exceptional Performance" Coexist
Biodegradable
Biodegrades naturally after disposal; no environmental burden.
Heavy metal-free
Full chrome-free tanning process eliminates heavy metal risks for enhanced product safety.
Azo-free
Azobenzene-free; meets international environmental safety standards
Water-repellent
Water-repellent leather treatment for an enhanced user experience
Natural Sandalwood
Vegetable-tanned leather emits a natural sandalwood scent, bringing you back to nature's essence.
Low Bisphenol
Low-BPA series meets stringent U.S. and European safety standards to reduce chemical residue.
Foundation of Quality
Upholding Zhenglong's spirit of craftsmanship, we rigorously control every production step to ensure product excellence and stability. Our quality control system exceeds industry standards, ensuring every inch of leather embodies Zhenglong's commitment.
Raw Material Inspection
Rigorous supplier screening; premium raw hides imported from Europe with material analysis for every batch.
Vegetable Tanning Process Control
Tanned with natural plant tannins; tanning parameters monitored throughout the process.
Final Inspection
Comprehensive testing of leather thickness, color fastness, and physical properties.
Outbound Quality Control
Inspect each piece individually to ensure it meets quality standards.
Quality Promise
Zhenglong commits to delivering internationally certified vegetable-tanned leather products for every client. With end-to-end quality control from raw material to finished product, your work begins on a foundation of reliable quality.