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Mylar® EL21 polyester films are flexible strong and durable films with an unusual balance of properties, making them suitable for a variety of industrial applications. The excellent dielectric strength, moisture resistance, and physical toughnes make Mylar® EL21 a very versatile and functional insulating material.
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Mylar® EL21 films offer high dielectric strength, good chemical resistance, and exceptional durability in high-temperature enviroments.
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Mylar® type EL21 films, similar to Mylar® type MO films, are heavy gauge insulating films designed for general purpose electrical/electronic applications, such as transformers, laminates, bus bars, and punched parts.
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UL Recognition -
Product has been registered with Underwriters Laboratories.
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| Available Thickness [Gauge] |
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750; 900; 1000; 1400
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| Property |
Thickness |
Value |
Units |
Test |
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ELECTRICAL
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| Breakdown Voltage |
750 |
17.5 |
kV |
ASTM D149 1/4" electrode 500 V/sec 25℃ in air |
| Breakdown Voltage |
900 |
18.4 |
kV |
ASTM D149 1/4" electrode 500 V/sec 25℃ in air |
| Breakdown Voltage |
1000 |
19.0 |
kV |
ASTM D149 1/4" electrode 500 V/sec 25℃ in air |
| Breakdown Voltage |
1400 |
20.0 |
kV |
ASTM D149 1/4" electrode 500 V/sec 25℃ in air |
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OPTICAL
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| Opacity |
750 |
38 |
% |
optical density |
| Opacity |
900 |
41 |
% |
optical density |
| Opacity |
1000 |
42 |
% |
optical density |
| Opacity |
1400 |
46 |
% |
optical density |
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PHYSICAL
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| Density |
750 |
1.3928 |
g/cc |
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| Density |
900 |
1.3920 |
g/cc |
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| Density |
1000 |
1.3925 |
g/cm3 |
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| Density |
1400 |
1.3925 |
g/cc |
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| Elongation at Break MD |
750 |
140 |
% |
ASTM D882A |
| Elongation at Break MD |
900 |
150 |
% |
ASTM D882A |
| Elongation at Break MD |
1000 |
150 |
% |
ASTM D882A |
| Elongation at Break MD |
1400 |
170 |
% |
ASTM D882A |
| Elongation at Break TD |
750 |
115 |
% |
ASTM D882A |
| Elongation at Break TD |
900 |
130 |
% |
ASTM D882A |
| Elongation at Break TD |
1000 |
140 |
% |
ASTM D882A |
| Elongation at Break TD |
1400 |
170 |
% |
ASTM D882A |
| Tensile Strength MD |
750 |
27 |
kpsi |
ASTM D882A |
| Tensile Strength MD |
900 |
27 |
kpsi |
ASTM D882A |
| Tensile Strength MD |
1000 |
27 |
kpsi |
ASTM D882A |
| Tensile Strength MD |
1400 |
26 |
kpsi |
ASTM D882A |
| Tensile Strength TD |
750 |
30 |
kpsi |
ASTM D882A |
| Tensile Strength TD |
900 |
29 |
kpsi |
ASTM D882A |
| Tensile Strength TD |
1000 |
29 |
kpsi |
ASTM D882A |
| Tensile Strength TD |
1400 |
25 |
kpsi |
ASTM D882A |
| Yield (nominal) |
750 |
2,600 |
in²/lb |
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| Yield (nominal) |
900 |
2,200 |
in²/lb |
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| Yield (nominal) |
1000 |
2,000 |
in²/lb |
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| Yield (nominal) |
1400 |
1,400 |
in²/lb |
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THERMAL
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| Shrinkage MD (150℃) |
750 |
1.6 |
% |
Unrestrained @ 150℃/30 min |
| Shrinkage MD (150℃) |
900 |
1.6 |
% |
Unrestrained @ 150℃/30 min |
| Shrinkage MD (150℃) |
1000 |
1.5 |
% |
Unrestrained @ 150℃/30 min |
| Shrinkage MD (150℃) |
1400 |
1.3 |
% |
Unrestrained @ 150℃/30 min |
| Shrinkage TD (150℃) |
750 |
0.9 |
% |
Unrestrained @ 150℃/30 min |
| Shrinkage TD (150℃) |
900 |
1.1 |
% |
Unrestrained @ 150℃/30 min |
| Shrinkage TD (150℃) |
1000 |
1.1 |
% |
Unrestrained @ 150℃/30 min |
| Shrinkage TD (150℃) |
1400 |
0.8 |
% |
Unrestrained @ 150℃/30 min |
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| Core I.D. (Inches) |
Roll O.D. (Inches) |
Thickness (Gauge) |
Length (Feet) |
| 3 |
13 |
750 |
1,360 |
| 3 |
13 |
900 |
1,140 |
| 3 |
13 |
1000 |
1,020 |
| 3 |
13 |
1400 |
730 |
| 10 (Master roll) |
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750 |
5,400 |
| 10 (Master roll) |
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900 |
4,520 |
| 10 (Master roll) |
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1000 |
4,070 |
| 10 (Master roll) |
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1400 |
2,850 |
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Mylar® Specialty Films U.S. Limited Partnership
3600 Discovery Drive
Chester, VA 23836-6436 USA
Tel: (800) 635-4639
Fax: (804) 530-9867
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Note: These values are typical performance data for Mylar® Specialty Films' polyester film; they are not intended to be used as design data. We believe this information is the best currently available on the subject. It is offered as a possible helpful suggestion in experimentation you may care to undertake along these lines. It is subject to revision as additional knowledge and experience is gained. Mylar® Specialty Films makes no guarantee of results and assumes no obligation or liability whatsoever in connection with this information. This publication is not a license to operate under, or intended to suggest infringement of, any existing patents.
CAUTION: Do not use in medical applications involving permanent implantation in the human body (Mylar® Specialty Films Medical Policy). For other medical applications, see the Medical Caution Statement. Mylar® Specialty Films accepts no liability for use of it's products in medical applications not reviewed and approved by Mylar® Specialty Films or for product misuse. Mylar® Specialty Films supplies products to an agreed specification and does not manufacture products designed specifically for medical end use.
Melinex®, Mylar® and Melinex® STTM are registered trademarks of Mylar® Specialty Films U.S. Limited Partnership.
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