SKC Skyrol SR50 PET Film is a single-gauge polyester film at 23 micron, and its product sheet reads like a short insulation and clarity profile: 7.0 percent haze and 6.4 kV dielectric strength
Two numbers on the SKC Skyrol SR50 PET Film sheet set it apart from a clear film: haze of 7.0 percent, and a dielectric strength of 6.4 kV at 23 micron. The sheet gives no application text, so the numbers have to do the talking.
What the Product Sheet Gives
- Nominal thickness: 23 um (SKC marks the gauge number alongside)
- Tensile strength: about 23 kg/mm2 in MD and 24 kg/mm2 in TD, which is roughly 225 and 235 MPa using SKC’s own conversion of 1 kg/mm2 = 9.8 N/mm2 (ASTM D882)
- Elongation at break: about 130 percent in MD and 110 percent in TD (ASTM D882)
- Heat shrinkage at 150°C for 30 minutes: about 2.0 percent in MD and 1.0 percent in TD (SKC method)
- Haze: 7.0 percent (ASTM D1003)
- Dielectric strength: 6.4 kV (ASTM D149)
Reading the 7.0 Percent Haze
Haze measures how much of the light passing through a film is scattered, so a higher number means a cloudier film. At 7.0 percent, SR50 is clearly hazy: a clear film such as Toray Lumirror T60 PET Film shows about 0.6 percent at its thinnest grade. Hazy polyester is often chosen on purpose, because a slightly rough surface helps film wind and slide cleanly (a general explanation, not from this sheet). The sheet does not say why SR50 is hazy, so confirm the reason and the surface with your supplier.
Reading the 6.4 kV Dielectric Strength
Dielectric strength is the voltage at which the film fails electrically, so a higher number means stronger insulation. It generally rises with thickness, so 6.4 kV is a 23 micron figure and should not be compared with thicker grades. The sheet does not give the test conditions beyond the method, so use it as a guide and request details if insulation is critical in your design.
Strength and Heat Behavior
Tensile strength of about 225 to 235 MPa is typical for a standard polyester film at this gauge, and it is similar in both directions, which suggests a balanced film. Heat shrinkage is about 2.0 percent in MD and 1.0 percent in TD at 150°C, and MD is higher than TD, as it usually is. If your process includes drying or lamination ovens, those are the figures to check, and the shrinkage is on the higher side compared with heat stabilized grades.
How It Differs from Neighboring Grades
- Toray Lumirror S10 PET Film is a standard film that also offers a 23 um grade, with breakdown voltage of about 7.5 kV, MD and TD tensile strength of about 215 to 221 MPa, and shrinkage of about 1.2 percent in MD and 0.1 percent in TD. Against it, SR50 shows a little lower dielectric strength (6.4 kV), a little higher strength (about 225 to 235 MPa), and higher shrinkage (about 2.0 and 1.0 percent). The two makers use different test methods for shrinkage, so compare by sample, not by number.
- SKC Skyrol SW83G PET Film is the white, ink-treated Skyrol grade for labels. SR50 is a different branch: a hazy film with insulation data and no color or treatment described.
What the Sheet Does Not Say
- SKC states elsewhere that its published results are a general guide to material properties and not a guarantee. Treat the numbers as typical.
- No description, application, surface treatment, friction value, or food contact statement is given for SR50, and only one gauge (23 um) is listed.
- The tensile figures are given in SKC’s kg/mm2 units, and the conversions here are approximate.
Quick Answers
What thickness is SR50?
23 um.
How hazy is it?
Haze of 7.0 percent, which is noticeably cloudy.
What is the dielectric strength?
6.4 kV at 23 um.
What applications does the sheet list?
None. Ask your supplier about intended uses.
Can I buy SKC Skyrol SR50 PET Film from Jinlu Film?
Yes. Jinlu Film supplies SKC Skyrol SR50 PET Film. If you prefer a comparable-specification alternative, including domestic options, we can offer those as well, together with datasheets and samples so you can test them on your own line.
More PET Film Guides
- SKC Skyrol PET Film safety data sheet: what the first three sections say
- SKC Skyrol SW83G PET Film: a white opaque film for labels and ink jet
Related Toray Lumirror Guides
- Toray Lumirror E20 White PET Film: a pigment filled opaque white film
- Toray Lumirror S10 PET Film: the general-purpose standard film
- Toray Lumirror T60 PET Film: a high transparent film for labels and graphics
Sourcing Hazy Standard Film
Jinlu Film supplies SKC Skyrol SR50 PET Film, along with comparable polyester film grades, including domestic alternatives. Tell us your application, thickness, and the haze and insulation level you need, and contact us for technical data, samples, or a factory quote.
Source: SKC’s publicly available Skyrol SR50 product information (typical values, Chinese-language version). Please refer to the latest official version. Skyrol, SKC, and related names are trademarks of their respective owners. Jinlu Film’s guide is an independent explanation for reference only.
