Polyonics Unveils XT-657,a Flame-retardant Bonding Tape to Prevent Propagation of Fire 

Westmoreland, NH -- Polyonics new XT-657 flame retardant double coated bonding tape helps prevent the propagation of fire, provides dielectric separation between electrical circuits and eliminates mechanical fasteners in battery assemblies and packs. The halogen free UL94 VTM-0 tested tape provides a high strength, thin conformal bonding system that has proven effective in bonding Li-ion batteries used in todays space-constrained consumer electronics devices as well in industrial power and battery applications.

Polyonics XT-657 halogen free flame retardant double coated bonding tape provides a bonding system that eliminates the need for mechanical fasteners while helping to prevent the propagation of fire. The UL94 tested and VTM-0 rated tape creates a thin, conformal bond line and has an adhesive strength of greater than 32 oz/in (> 35N/100 mm). In addition, XT-657 has a high dielectric strength (>7.6kV/mil) that provides electrical separation between circuits plus is an excellent thermal insulator that is rated for 572F INSERT INTO [lzx].[dbo].[tb_new]([id],[type],[title],[source],[personal],[image],[contents],[time],[number]) VALUES (300C).

The engineered tape has proven effective in bonding applications in a wide range of industries. These include attaching batteries, devices and components in space-constrained consumer electronics (smart phones, tablets, etc.) as well as in industrial electronics, power systems and batteries. Shown at right, a Li-ion battery is bonded to a PCB using the Polyonics flame retardant XT-657 tape while the edges of the battery case are sealed using Polyonics XT-708, a single coated antistatic and flame retardant matte black polyimide tape. In addition, the PCM circuit, at the end of the battery, is also isolated with Polyonics XT-624, a single coated flame retardant amber polyimide masking tape.

Tape Construction

The REACH and RoHS compliant tape includes a 1 mil INSERT INTO [lzx].[dbo].[tb_new]([id],[type],[title],[source],[personal],[image],[contents],[time],[number]) VALUES (25 m) polyimide film, two layers of 1 mil flame retardant acrylic pressure sensitive adhesive (PSA) and a variety of liners that aid in handling, die-cutting and auto-application. The tape can be configured with different PSAs to best match the surfaces the tape will be affixed to as well as the converting process.

The Polyonics XT-657 engineered tape remains dimensionally stable at high temperatures, is resistant to the typical chemicals used in PCB manufacturing and designed to remain effective throughout wave solder and reflow processes. The tape also complies with the aerospace FAR 25.853 and BSS 7238/7239 smoke and toxicity standards.

FlameGard

Polyonics flame retardant tapes are designed using FlameGard technologies that help prevent the propagation of fire through a series of chemical mechanisms that actively retard the burn cycle (see combustion diagram far right, second from top). These flame retardant mechanisms include resins and polymers that are dimensionally stable plus dont generate significant amounts of flammable gasses when exposed to heat and flame. In addition, upon initial combustion, the tape creates a char layer that acts as a heat shield (a physical mechanism) slowing the rate of thermal oxidation and reducing thermal degradation.

About Polyonics

Polyonics manufactures high performance single and double coated tapes, label materials, films and flexible substrates in its Westmoreland, NH factory. The high quality materials are used by specialty die-cut converters and OEMs worldwide. The ultra-thin polyimide, PET and aluminum materials are designed expressly for high temperatures and harsh environments plus provide flame retardant and static dissipative performances for electronics, automobile, aerospace and medical components.