Flexible Material Products

Both are meta-aramid papers manufactured by DuPont and used in Class H electrical insulation systems, but they are designed for different functions. Nomex 410 is a dense, calendered paper used as the primary insulation layer in slot liners and transformer winding insulation. Nomex 414 is a thinner, more porous grade designed for use as a prepreg substrate or in situations where resin absorption is required. The correct grade depends on whether the material is being used as a dry insulation layer or as part of a resin-impregnated system.

In most situations, yes. Mylar (DuPont) and Melinex (Teijin Films) are both biaxially oriented PET films with comparable electrical, mechanical, and thermal properties at equivalent grades and thicknesses. However, if your motor or transformer design is built to a qualified insulation system that specifies one brand by name, you should confirm with your engineering team before substituting the other. We can supply both and confirm available grades for your specific requirement.

NMN stands for Nomex/Mylar/Nomex, describing the three-layer construction of the laminate. The outer layers are Nomex 410 aramid paper and the core is Mylar polyester film. Standard NMN constructions are designated by the thickness of each layer. Common grades include 1-1-1 (1 mil Nomex / 1 mil Mylar / 1 mil Nomex) through heavier constructions such as 5-2-5. We stock a range of standard NMN grades and can confirm available thicknesses and widths for your requirement.

Kapton polyimide film carries a continuous thermal rating of 220 degrees Celsius (Class H) as a standalone film, and it is often used in insulation systems rated above Class H due to its ability to sustain properties well above that threshold. It is specified in NKN laminates and other high-temperature composite constructions where standard PET film would degrade in service.

Fishpaper, also called vulcanized fibre, is a cellulosic sheet material made by chemically treating layers of cotton rag paper. It is mechanically tough, has good dielectric properties, and is one of the most machinable flexible insulation materials available. It is commonly used for slot liners, washers, spacers, and mechanical insulation components in motors and electrical equipment. We stock Fishpaper in standard thicknesses and can convert it to custom shapes.

Yes. Polyester Dacron felt is available in multiple weights and densities depending on the amount of cushioning and gap fill required in the insulation system. Lighter-weight felts are used where minimal thickness addition is acceptable, while heavier grades are used when more compression and gap fill is needed in the slot geometry. Contact us with your slot dimensions and winding specifications for a recommendation.

Yes. We convert flexible laminate materials from standard roll stock to custom widths, lengths, and shapes. If you have slot dimensions, panel sizes, or winding specifications, our team can quote custom-converted supply from our stocked laminate grades. We also die-cut slot liners and other formed shapes for customers who need production-ready insulation components rather than raw stock.

Minimum order quantities vary by material, grade, and form. Some materials are available from standard stock in smaller quantities for MRO or prototype use, while others require a minimum roll order. Contact our team with your specific material, thickness, and width requirements and we will confirm current stock availability and any applicable minimums.