PET & Tinned Copper Braided Sleeving-BEMI700 Overview

The PET & Tinned Copper Braided Sleeving-BEMI700 is a hybrid-braided EMI shielding sleeving engineered for new energy vehicle (NEV) electrical harness systems. It combines tinned copper wire with orange PET monofilament in a co-braid structure, delivering shielding effectiveness above 60 dB from 30 MHz to 3 GHz as measured per GB/T 30142. The expandable braid construction, orange high-voltage circuit identification, and FMVSS 302 flammability compliance make the PET & Tinned Copper Braided Sleeving-BEMI700 a purpose-built solution for battery cable shielding, dashboard harness protection, and engine compartment harness routing in NEV platforms.

For harness engineers evaluating shielding sleeving, the key question is whether the sleeve maintains consistent shielding performance under vehicle vibration, thermal cycling, and service demands. This product is designed to be evaluated against those criteria with documented test data, supporting formal automotive OEM and Tier 1 qualification processes.

Core Technical Performance

All performance values listed for the PET & Tinned Copper Braided Sleeving-BEMI700 are typical values. Test reports for shielding effectiveness and flammability are available through your sales representative for supplier qualification documentation.

Functional Features

Verified EMI Shielding Above 60 dB

Shielding effectiveness is measured per GB/T 30142 and consistently exceeds 60 dB from 30 MHz to 3 GHz. A common assumption is that a larger diameter braided sleeve automatically provides stronger EMI suppression. In practice, shielding performance depends on braid coverage density and the conductivity of the metal conductor — not on outer diameter alone. The PET & Tinned Copper Braided Sleeving-BEMI700 achieves its shielding rating through controlled braid angle and tinned copper conductor selection, which directly determines coverage density. This distinction matters when comparing options at the same nominal size range, since coverage density varies significantly between products that appear catalog-equivalent.

FMVSS 302 Flame Retardant Compliance

The flammability test per FMVSS 302 confirms compliance with flame retardant requirements for automotive interior materials. In NEV harness qualification programs, flame retardancy is frequently overlooked when attention is focused on shielding performance and dimensional fit. Discovering this compliance gap at the supplier audit stage typically triggers a re-selection cycle that delays the harness qualification schedule. Confirming FMVSS 302 compliance at the sourcing stage avoids that delay. The manufacturing site holds ISO 9001, IATF 16949, ISO 14001, ISO 45001, and military GJB9001C certifications, supporting quality management documentation for automotive supply chain qualification.

Wide Thermal Range: -50°C to 150°C

The -50°C to 150°C operating range covers the full thermal envelope encountered in NEV harness routing. In high-temperature routing zones adjacent to the motor controller and power electronics, sleeving materials with insufficient thermal stability show early signs of degradation — subtle color shifts, surface texture changes, or reduced dimensional stability — before structural failure. These are observable indicators of thermal aging recognizable during harness inspection. The PET monofilament in the PET & Tinned Copper Braided Sleeving-BEMI700 maintains dimensional stability at the upper end of its rated temperature range, preserving sleeve geometry and shielding coverage under sustained thermal load.

Expandable Braid for Assembly Efficiency

The co-braid expands radially when compressed lengthwise — similar to how woven mesh tubing widens when shortened — allowing placement over connectors and harness branch points without disassembly. This characteristic is particularly useful in NEV battery cable routing where connector access is restricted once a sub-assembly is partially secured. The expandable property reduces tooling requirements during installation and supports consistent installation quality across assembler skill levels on the harness production line.

Orange Identification for High-Voltage Circuit Management

The orange PET monofilament provides high-visibility color supporting circuit identification in the assembly environment. In NEV architectures where high-voltage harnesses run alongside low-voltage communication cables, visible color differentiation reduces mis-routing during assembly and simplifies post-installation inspection and serviceability. The orange color aligns with common OEM high-voltage harness conventions, easing visual verification during both production and field service operations.

Application Scenarios

Battery Cable Shielding — Primary Application

The PET & Tinned Copper Braided Sleeving-BEMI700 is primarily deployed on battery cables in NEV powertrain architectures — covering high-voltage lines from the battery pack to the motor inverter and instrumentation cables requiring EMI suppression. In 400 V and 800 V powertrain systems, the electromagnetic environment around primary battery cables generates interference significantly higher than conventional 12 V systems. A shielding sleeving with documented performance above 60 dB provides the harness design team a quantifiable reference for EMC validation reporting. The GB/T 30142 test result serves as a verifiable data anchor for supplier qualification packages where documented shielding performance is required.

Dashboard Harnesses and Engine Compartment Routing

Dashboard harnesses carrying CAN, LIN, and low-voltage sensor circuits are sensitive to interference from adjacent power electronics. The PET & Tinned Copper Braided Sleeving-BEMI700 provides combined EMI shielding and abrasion resistance in a single sleeve, reducing material complexity compared to solutions requiring a separate abrasion wrap over a standalone metal braid. In engine compartment routing, the 150°C temperature capability is the applicable specification for harness segments adjacent to the motor and power distribution unit. The IATF 16949 quality system certification provides process control documentation for periodic supplier reviews by Tier 1 harness manufacturers and OEM purchasing teams.

Product Specifications

Reference width indicates the nominal braid diameter; applicable range indicates the recommended cable bundle outer diameter for effective shielding coverage. Match cable bundle outer diameter to the applicable range column for sizing confirmation. The expandable construction of the PET & Tinned Copper Braided Sleeving-BEMI700 provides installation flexibility at the boundaries of the applicable range.