Welcoming Authoritative Review | Forging Excellence with Precision, Lianhe Qiang Welcomes Certification Supervision and Verification for Central Windows
Aug 11,2026
2026 year 08 month 11 On [date], an expert review team from Zhongchuang Certification and Testing Technology (Beijing) Co., Ltd. paid a visit to the Zhongshan Lianhe Qiang Rubber and Plastics Technology Industrial Park, officially launching the on-site certification audit for building doors and windows as well as curtain wall sealing strips. This authoritative on-site review by industry experts represents a thorough assessment of our comprehensive capabilities across the entire value chain—research and development, manufacturing, and quality control—of our full range of sealing strips.
Rigorous On-site Evaluation
Comprehensive verification of the product’s core strengths.
Zhongchuang Certification has long been dedicated to the doors, windows, and curtain wall industry and is a highly respected, authoritative third-party certification body within the sector. Adhering to the industry principle that quality homes deserve quality doors and windows, and that superior doors and windows rely on high‑grade sealing strips, we have developed a rigorous and comprehensive set of standards for reviewing sealing components. This audit team conducted a comprehensive, multi‑dimensional review by visiting the production workshop, the raw‑material storage area, and the dedicated physicochemical laboratory. They meticulously examined every stage, from raw‑material receiving controls and rubber/plastic formulation adjustments to extrusion molding processes and finished‑product performance testing, as well as factory‑exit quality‑inspection procedures and equipment maintenance records.
The expert panel focused on key product lines, including platinum‑cured silicone sealing strips, EPDM rubber strips, and custom sealing components for system windows and doors, evaluating core performance indicators such as strip resilience and elasticity, outdoor weather resistance and aging durability, waterproofing and airtightness, as well as sound insulation and thermal insulation.
Deeply committed to rubber and plastic sealing.
Solidify the invisible foundation of system windows and doors.
As a participating drafting unit of the national standard for architectural sealing strips and the lead drafting organization for the national standard on expansion joints, Zhongshan Lianhe Qiang Rubber & Plastic Technology has long been dedicated to the field of sealing components for doors, windows, and curtain walls. We have always recognized that weatherstripping is a critical component of doors and windows—often overlooked yet pivotal to the living experience. The water‑tightness, thermal insulation, noise reduction, and long‑term durability of an entire door or window all hinge on the quality of its sealing strips. The company has consistently maintained internal quality-control standards that exceed industry benchmarks, rigorously selecting every batch of rubber and plastic raw materials, continuously refining its manufacturing processes, and operating an in-house testing laboratory to optimize product performance. Its sealing products are now supplied to numerous window and door brands worldwide, as well as to large-scale landmark construction projects.
At present, the on-site verification has just begun, with staff from all departments of the company fully cooperating with the expert panel in retrieving archives, conducting field inspections, collecting and testing samples, and conducting procedural inquiries. Taking this Zhongchuang certification audit as a valuable opportunity for self-assessment, Lianheqiang will align its operations with the certification standards to address production‑management shortcomings, upgrade its quality‑control system, and steadfastly uphold the highest standards for high‑end sealing products.
Going forward, we will continue to deepen our expertise in the architectural rubber and plastic sealing market, delivering reliable, durable, high‑performance sealing solutions for the system window and curtain wall industries. We will safeguard every high‑quality window and door, supporting the development of contemporary, premium residential environments.
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