Recommendations for Purchasing Black PET Coated Wires

2025.04.30

Author：black PET coated wire

Through the following technical indicator screening, quality risk investigation, supplier evaluation and contract terms constraints, we can effectively avoid technical traps and business risks in the purchase of black PET coated wires and ensure the long-term reliability of the project.

1. Clarify the core demand parameters

1. Electrical performance adaptation

Rated voltage: Select according to the application scenario (for example, industrial equipment needs ≥600V, precision electronics can choose 300V)

Current carrying capacity: refer to the conductor cross-sectional area and temperature coefficient (for example: 2.5mm2 copper core carries about 25A at 70℃)

High frequency attenuation: signal transmission lines need to pay attention to dielectric constant (≤3.5) and capacitance value (≤100pF/m@1MHz)

2. Environmental tolerance threshold

Temperature range: conventional PET is suitable for -40℃~120℃, and modified PET (-60℃) or silicone rubber composite wire should be selected in extremely cold areas

Chemical tolerance: Confirm the compatibility of the coating with engine oil/acid and alkali (for example: in the cutting fluid environment, it needs to pass ISO 1817 immersion test)

Ultraviolet protection: outdoor use requires the addition of ≥2% UV absorber (ASTM G154 aging test ≥2000 hours)

3. Mechanical protection level

Abrasion resistance: Taber abrasion test ≥1000 turns (coating thickness ≥0.15mm)

Bending life: dynamic bending test ≥50,000 times (bending radius ≤5 times the wire diameter)

Tensile strength: ≥15N/mm2 (IEC 60811-501 standard)

II. Quality risk point inspection list

Conductor quality identification

Copper purity: oxygen-free copper (OFC) resistivity ≤0.0172Ω·mm2/m (better than 0.0178 of ordinary copper)

Stranding process: compact stranded wire (filling factor ≥0.9) vs loose stranded wire (easy to break)

Oxidation detection: no blackening on the conductor surface (visual + copper ion reagent detection)

Certification and standard matching

Mandatory certification: China 3C, EU CE, US UL (e.g.: UL 758 for equipment wiring)

Flame retardant level: VW-1 (vertical burning), FT2 (horizontal burning), LSZH (low smoke halogen-free)

Environmental protection standard: RoHS 2.0 (lead <0.1%, cadmium <0.01%), REACH SVHC list

III. Supplier evaluation system

1. Production capacity verification

Coating process: Co-extrusion process is preferred (adhesion> physical winding)

Testing equipment: Xenon lamp aging box, tensile testing machine, dielectric spectrum analyzer are required

Capacity guarantee: daily production capacity ≥50km, inventory turnover rate <30 days (avoid long-term inventory oxidation)

2. Case verification

Similar projects: ≥3 successful cases of the same scenario are required (for example: photovoltaic power stations need to provide more than 5 years of operation data)

Failure rate: Cable failure rate within the warranty period <0.5% (third-party test report required)

IV. Purchase decision tree

1. High-risk environment (directly select PET)

Outdoor/high temperature/corrosive environment (for example: photovoltaic power stations, chemical production lines)

Precision electronics/medical equipment (need low dielectric loss, biocompatibility)

Public safety scenarios (subways, ships, hospitals)

2. Low-cost scenario (cautious substitution)

Indoor dry environment and service life <3 years (PVC can be considered)

Temporary wiring/low-frequency signal transmission (e.g. Christmas light string, low-speed sensor)

3. Controversial scenario (technical verification required)

Low-temperature environment (-40℃~-50℃): laboratory testing of coating embrittlement point is required

Oil-immersion environment: send samples to a third party for 72-hour oil immersion test

V. Guide to avoiding pitfalls

1. False certification traps

Beware of "UL certification" that only covers some models (UL file number is required for query)

Environmental protection certificates must be marked with specific test methods (e.g. RoHS 2.0 requires XRF scanning + ICP testing)

2. Parameter false labeling identification

Falsified current carrying capacity: IEC 60287 thermal simulation report is required

Falsified temperature resistance: use a thermal imager to detect the actual operating temperature (e.g.: claiming that a 120℃ line softens at 80℃)

3. Contract risk clauses

Specify the warranty period (recommended ≥5 years) and compensation clauses (e.g. daily compensation for production suspension due to cable failure)

Acceptance criteria: must include third-party testing reports (such as SGS, TüV)

Qingdao Chenan Machinery Co., Ltd. has the advantage of developing and producing rubber winding equipment, with higher technology than various equipment assembly manufacturers in the industry. For more information about black PET coated wire, please contact us.

Company: Qingdao Chenan Machinery Co., Ltd.

Address: Yanjialing Industrial Park, East Chengma Road, Tongji New Economic Zone, Jimo District, Qingdao City, Shandong Province

Email: qdcajx@gmail.com