Name: DMD – Dacron / Mylar / Dacron
Brand: Contact for Price & Availability
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Roll of DMD insulation (Dacron/Mylar/Dacron), a flexible Class F-rated electrical insulation material with a smooth, light grey surface and cardboard core, displayed on a pale grey background.

Flexible Insulation Laminates

DMD – Dacron / Mylar / Dacron
Class F (150°C) Flexible Electrical Insulation

DMD is a high-performance flexible insulation material composed of two outer layers of non-woven Dacron® polyester and an inner layer of Mylar® polyester film. Designed for Class F electrical insulation systems, it delivers excellent dielectric strength, mechanical integrity, and heat resistance up to 150°C. Commonly used in slot and phase insulation for electric motors and transformers.

Key Features:

Triple-layer laminate: Dacron / Mylar / Dacron for strength and durability
Class F rating: Withstands continuous operating temperatures up to 150°C
Flexible and tear-resistant: Easy to handle and apply
Good dielectric performance: Suitable for low and medium voltage insulation systems

Typical Applications:

Slot, phase, and liner insulation in electric motors
Layer insulation in coils, transformers, and appliances
Often paired with insulating varnishes and resins for enhanced thermal bonding
Compatible with fibreglass and silicone sleeving in full motor rewind assemblies

Available Options:

Supplied in full rolls (1 metre wide) or cut by the square metre
Standard lay-ups (outer / film / outer):

2 / 2 / 2 2 / 3 / 2 3 / 3 / 3 3 / 5 / 3 5 / 3 / 5 5 / 5 / 5 5 / 10 / 5

Format: outer layer / polyester film / outer layer

A dependable insulation laminate for applications requiring mechanical strength, flexibility, and Class F thermal performance.

Need Help Choosing?

See the DMD Grade Selection Guide and DMD vs NMN Comparison below before requesting a quote.

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DMD Grade Selection Guide

DMD is available in a range of lay-ups to suit different insulation thickness requirements. The format is shown as outer polyester / polyester film / outer polyester.

DMD Grade	Construction	Typical Use
2 / 2 / 2	Lightweight DMD laminate	Applications requiring a thinner, more flexible insulation material.
2 / 3 / 2	Thin DMD laminate with increased film thickness	General electrical insulation and motor rewinding applications.
3 / 3 / 3	Balanced DMD construction	One of the most commonly used grades for slot, phase and liner insulation.
3 / 5 / 3	Increased polyester film content	Applications requiring additional dielectric separation and mechanical strength.
5 / 3 / 5	Heavier polyester outer layers	Motor rewinding and electrical equipment requiring increased mechanical durability.
5 / 5 / 5	Heavy-duty DMD laminate	General heavy-duty slot, phase and transformer insulation.
5 / 10 / 5	Maximum film thickness in the standard range	Applications requiring increased insulation thickness and dielectric separation.

DMD vs NMN / NPN – Which Insulation Should You Choose?

DMD and NMN / NPN are two of the most commonly used flexible electrical insulation laminates in motor rewinding and transformer applications. Both offer excellent dielectric strength and flexibility, but NMN is designed for higher-temperature Class H insulation systems.

Feature	DMD	NMN / NPN
Temperature Class	Class F	Class H
Continuous Temperature Rating	150°C	180°C
Construction	Dacron® / Mylar® / Dacron®	Nomex® / Mylar® / Nomex®
Typical Applications	Standard motors, transformers, coils and appliance insulation	High-temperature motors, generators, dry-type transformers and Class H electrical systems
Best Choice When	A Class F insulation system is suitable for the application	Additional thermal endurance and Class H performance are required