Pyralux® Bonding Films

Pyralux® Coverlays, Bondplys & Sheet Adhesives

DuPont™ Pyralux® bonding films have been a standard in the flex circuit industry for over 30 years.

Coverlays consist of DuPont™ Kapton® polyimide film coated on one side with acrylic adhesive, using Pyralux® LF or FR, epoxy adhesive, or fluropolymer adhesive.

Bondplys are coated on both sides with acrylic adhesive, using Pyralux® LF or FR.

Adhesives are provided as ‘B-stage’ films coated onto release paper.

Bonding films are available with either acrylic adhesive, using Pyralux® LF or FR, or epoxy adhesive, which is available under the Nikaflex® brand name. DuPont also offers a photoimagable dry film coverlay known as Pyralux® PC.

The exception to this is Pyralux® JT which has a different construction, see below for detail.

Pyralux® Coverlays

Pyralux® FR - DuPont™ Pyralux® FR coverlay composites are constructed of DuPont™ Kapton® polyimide film, coated on one side with a proprietary B-staged modified acrylic adhesive.

Pyralux® JT - DuPont™ Pyralux® JT coverfilm is a homogeneous, B-stage material that becomes a thermoset during press lamination. The JT coverfilm is coated on a polyester carrier film. There is no Mylar release sheet. Pyralux® JT comes on a roll.

Pyralux® LF - DuPont™ Pyralux® LF coverlay composites are constructed of DuPont™ Kapton® polyimide film, coated on one side with a proprietary B-staged modified acrylic adhesive. 

Pyralux® LF-B - DuPont™ Pyralux® LF-B is a black polyimide acrylic coverlay made with DuPont™ Kapton® B polyimide film ideal for products where a uniform, aesthetically pleasing appearance is desired.

Pyralux® PC - DuPont™ Pyralux® PC 1000 is a modified acrylic flexible photoimagable dry film coverlay used for single and double sided applications that require fine line resolution along with bend and crease flexibility.

Pyralux® HXC -DuPont™ Pyralux® HXC is DuPont™ Kapton® MBC black polyimide film coated with epoxy ideal for products where uniform matte black appearance is desired. 

Pyralux® Bondplys

Pyralux® FR - DuPont™ Pyralux® bondply composites are constructed of DuPont™ Kapton® polyimide film coated on both sides with a proprietary B-staged modified acrylic adhesive. 

Pyralux® JT - When used as a bonding material, the Pyralux® JT polyester carrier film is removed, the Pyralux® JT is placed on a panel and the next panel is placed on the Pyralux® JT. Any other layers needed are laid up and the part is laminated in a lamination press under heat and pressure.

Pyralux® LF - DuPont™ Pyralux® bondply composites are constructed of DuPont™ Kapton® polyimide film coated on both sides with a proprietary B-staged modified acrylic adhesive.

Pyralux® TK - DuPont™ Pyralux® TK is a  fluoropolymer/polyimide composite double sided copper clad laminate and bondply ideal for high speed digital and high frequency flexible circuit applications.

Pyralux® Sheet Adhesives

Pyralux® FR - DuPont™ Pyralux® FR sheet adhesive is a proprietary B-staged modified acrylic adhesive coated on release paper. 

Pyralux® LF - DuPont™ Pyralux® LF sheet adhesive is a proprietary B-staged modified acrylic adhesive coated on release paper.

Pyralux® LG - DuPont™ Pyralux® LG is an acrylic impregnated glass fabric composite heat sink bonding and stiffener applications.

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