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Mylar® RL31 is a biaxially oriented polyester (OPET) with an ethylene vinyl acetate (EVA) heat seal layer. It is used as a heat sealable lidding film in packaging frozen and refrigerated foods. Mylar® RL31 is commercially available in nominal 50 and 100 gauges.
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Mylar® RL31 is designed to seal to a broad range of container substrates including amorphous polyester (APET, also PETG), semicrystalline polyester (CPET), polyester coated paperboard, polyvinylchloride (PVC), polyethylene (HDPE), polypropylene (PP), and polystryrene (HIPS).
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Heat seals with Mylar® RL31 are stronger than with Mylar® OL, but are still generally strippable from most container substrates. Shredding (film tear or break) can be minimized or eliminated by using higher gauges. Mylar® RL31 has a lower seal initiation temperature than lidding films with an amorphous polyester heat seal layer (e.g., Mylar® OL, OL2). This allows good seals to be made at higher line speeds (or using lower sealing temperatures). Mylar® RL31 is not recommended for applications where "caulking" is required.
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Mylar® RL31 can withstand freezing temperatures down to -40℉, and foods can be heated or cooked in contact with this film at temperatures up to 400℉. The oriented polyester base film will begin to distort in the range of 425-450℉.
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Corona Treatment (Mylar® RL31T): Selected gauges of Mylar® RL31 are available with corona treatment (on the opposite side of film from the heat seal layer) to enhance printing and laminating. This film type is marketed by Mylar® Specialty Films as Mylar® RL31T and is commercially available in nominal 50 and 100 gauges. The film is treated to an initial dyne level of 54. The dyne level of treated lidding films may decline with storage, and in-line corona treatment may be required during subsequent printing or laminating to increase the dyne level to a value adequate to get desired ink or laminate adhesion. Standard put-ups for Mylar® RL31T are the same as shown for Mylar® RL31.
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Anti-fog: Mylar® RL31 is not available with anti-fog capability.
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Food Contact Status -
Please contact your Mylar® Specialty Films representative to receive the Regulatory Compliance documents
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Disposal of Mylar® RL31 does not present special disposal problems. It can be buried as a relatively inert material in a landfill or burned in an incinerator with normal refuse. The incinerator should have sufficient draft to exhaust all combustion products through the stack to avoid exposure to irritating fumes. The disposal method should comply with local, state, and federal regulations.
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| Available Thickness [Gauge] |
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50; 75; 100
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| Property |
Thickness |
Value |
Units |
Test |
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BARRIER
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| Gas Permeability - O2, 24 hr |
100 |
5 |
cc/100 in² |
ASTM D3985 22℃/50% RH/1 ATM |
| Gas Permeability - O2, 24 hr |
50 |
9 |
cc/100 in² |
ASTM D3985 22℃/50% RH/1 ATM |
| Gas Permeability - O2, 24 hr |
75 |
7 |
cc/100 in² |
ASTM D3985 22℃/50% RH/1 ATM |
| WVTR |
100 |
1.3 |
g/100 in2/day |
ASTM F1249 38℃, 90% RH |
| WVTR |
50 |
2.8 |
g/100 in²/day |
ASTM F1249 38℃, 90% RH |
| WVTR |
75 |
1.9 |
g/100 in²/day |
ASTM F1249 38℃, 90% RH |
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PHYSICAL
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| Elongation at Break MD |
50 - 100 |
110 |
% |
ASTM D882A |
| Elongation at Break TD |
50 - 100 |
80 |
% |
ASTM D882A |
| Tear (Graves) |
100 |
1.1 |
lb |
ASTM D1004 |
| Tear (Graves) |
50 |
0.7 |
lb |
ASTM D1004 |
| Tear (Graves) |
75 |
0.9 |
lb |
Tear (Graves) |
| Tensile Strength MD (break) |
50 - 100 |
25 |
kpsi |
ASTM D882A |
| Tensile Strength TD (break) |
50 - 100 |
35 |
kpsi |
ASTM D882A |
| Unit Weight |
100 |
22.2 |
lb/ream |
ASTM E252 (0.5 m2) |
| Unit Weight |
50 |
12.7 |
lb/ream |
ASTM E252 (0.5 m2) |
| Unit Weight |
75 |
18.5 |
lb/ream |
ASTM E252 (0.5 m2) |
| Yield (nominal) |
100 |
19,500 |
in²/lb |
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| Yield (nominal) |
50 |
34,400 |
in²/lb |
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| Yield (nominal) |
75 |
23,200 |
in²/lb |
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| Core I.D. (Inches) |
Roll O.D. (Inches) |
Thickness (Gauge) |
Length (Feet) |
| 3 |
9 1/2 ± 1/4 |
50 |
8,200 |
| 3 |
9 1/2 ± 1/4 |
75 |
5,700 |
| 3 |
9 1/2 ± 1/4 |
100 |
4,800 |
| 3 |
13 ± 1/4 |
50 |
16,500 |
| 3 |
13 ± 1/4 |
75 |
11,500 |
| 3 |
13 ± 1/4 |
100 |
9,600 |
| 6 |
11 ± 1/4 |
50 |
8,200 |
| 6 |
11 ± 1/4 |
75 |
5,700 |
| 6 |
11 ± 1/4 |
100 |
4,800 |
| 6 |
14 ± 1/4 |
50 |
16,100 |
| 6 |
14 ± 1/4 |
75 |
11,200 |
| 6 |
14 ± 1/4 |
100 |
9,400 |
| 6 |
18 ± 1/4 |
50 |
29,600 |
| 6 |
18 ± 1/4 |
75 |
20,600 |
| 6 |
18 ± 1/4 |
100 |
17,300 |
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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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