---
type: "Technical Data Sheet"
title: "CMC 70821 – Technical Data Sheet"
description: "CMC 70821 is a Kapton® film with good thermal conductivity and very good insulating properties even at high temperatures."
resource: "https://datasheets.cmc.de/pdf/cmc-70821-en.pdf"
tags: ["kapton mt", "thermally conductive", "0.050 ± 15%"]
language: "en"
product: "CMC 70821"
product_family: "cmc"
document_date: "2019-10"
status: "stable"
translation: "/cmc-70821-de.md"
generated: { by: "process:cmc-datasheets/0.1.0", at: "2026-09-23T16:02:40Z" }
sources:
  - id: "pdf"
    resource: "https://datasheets.cmc.de/pdf/cmc-70821-en.pdf"
    title: "Technical Data Sheet CMC 70821"
    author: "CMC Klebetechnik GmbH"
    last_modified: "2019-10-02T11:41:16Z"
---

# CMC 70821 – Technical Data Sheet

[PDF data sheet (binding)](/pdf/cmc-70821-en.pdf) · [Deutsche Version](/cmc-70821-de.md)

Issued: 2019-10

## Product description

CMC 70821 is a Kapton® film with good thermal conductivity and very good insulating properties even at high temperatures. One side is coated with a pressure sensitive adhesive, the other side with a phase change wax providing clean and easy pre-assembly as well as improved heat transfer.

| Property | Value |
|---|---|
| Substrate | Kapton MT, thermally conductive |
| Colour | brown |
| Thermal conductivity in W/(m⋅K) of the Kapton film | 0.46 |
| Substrate thickness in mm | 0.050 ± 15% |
| Adhesive thickness in mm | ca. 0.025 |
| Thickness of the phase change wax in mm | ca. 0.018 |
| Total thickness in mm | 0.093 ± 10% |

## Adhesive Properties

| Property | Value |
|---|---|
| Type of adhesive / coating | 1st side acrylic adhesive 2nd side copolymer wax |
| Adhesive strength in N/cm according to internal method PV 1006-32 (180° peel from steel) | ≥ 2 (1st side) |

## Thermal Properties

| Property | Value |
|---|---|
| Flowing temperature of the wax in °C | ca. 95 |
| Temperature performance (max.) in °C | 180 |
| Insulation class according to IEC 60085 | F |

## Electrical Properties

| Property | Value |
|---|---|
| Breakdown voltage based on IEC 60243-1 in Veff. | ≥ 7'000 |

## Mechanical Properties

| Property | Value |
|---|---|
| Tensile strength in N/cm | ≥ 50 |
| Elongation at break in % | ≥ 20 |

## Other Properties

| Property | Value |
|---|---|
| Liner | siliconized paper |

® registered trade mark of DuPont de Nemours

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*The technical data are average values and do not replace the user's own testing. Subject to change without notice. The PDF data sheet is binding.*