Toray Lumirror X20 PET Film is a pigment filled brilliant white film at 38, 75, and 125 micron, and its optical density climbs only from 0.33 to 0.53
A white film for a display or an adhesive tape has to look clean and bright, and it often has to do that without being fully opaque. Toray Lumirror X20 PET Film is described as a brilliant white film with low opacity and color stability.
Which Thickness Should You Start With?
According to its datasheet, Lumirror X20 is a pigment filled white film with low opacity and color stability, described as a brilliant white film. The listed applications are display and adhesive tape. It comes in three thicknesses, and the choice mostly depends on how much light you want the film to block:
- 38 um: optical density about 0.33, the most light-passing of the three, with the highest TD tensile strength (about 235 MPa).
- 75 um: optical density about 0.36, close to 38 um, so you gain a thicker film without a large rise in opacity.
- 125 um: optical density about 0.53, the most opaque of the three, and the highest surface resistivity listed.
Optical density measures how much light the film blocks, and a higher number means less light gets through (JIS K7605). The jump from 0.36 to 0.53 between 75 and 125 um is larger than the jump from 0.33 to 0.36 between 38 and 75 um. In other words, if you need a thicker film but still want the lower-opacity look, 75 um sits in a useful middle spot.
What “Low Opacity” and “Color Stability” Mean on This Datasheet
The datasheet describes the film as having low opacity, and the optical density values of about 0.33 to 0.53 are on the lower side for a white film. The datasheet does not give a comparison with other white films, so treat low opacity as a description of this film rather than a ranking. Color stability is stated as a property, but the datasheet gives no test data such as yellowing under heat or light, so if color change matters in your application, ask for supporting data and run your own aging test.
The Rest of the Numbers
- Tensile strength: about 205 to 215 MPa in MD and 196 to 235 MPa in TD, easing as thickness increases (ASTM D882)
- Elongation at break: about 130 percent in TD for all grades, and about 140 percent in MD for 75 and 125 um (ASTM D882)
- Heat shrinkage at 150°C for 30 minutes: about 1.0 to 1.3 percent in MD and 0.3 to 0.5 percent in TD (ASTM D1204)
- Surface resistivity: about 1E+15 ohm per square for the thinner grade and 1E+16 for the thicker grade (ASTM D257)
Strength. The grades behave alike in strength, with a mild decline from 38 to 125 um. Note that MPa is force per unit area, so a thicker film can still carry more total load.
Heat. Shrinkage is low and similar across the three grades. MD shrinkage is higher than TD, as with most films. This matters for adhesive tape converting, where the film passes through coating and drying ovens.
Surface resistivity. Surface resistivity shows how easily static charge can spread across a surface, and a lower number means charge dissipates more easily. The datasheet gives values of about 1E+15 and 1E+16 ohm per square, which is high, so the film is generally an electrical insulator and may hold static charge (a general interpretation, not from this datasheet). Because the datasheet lists only two values for three thicknesses, ask your supplier which grade each value belongs to before relying on it.
Where the Datasheet Says It Is Used
The datasheet lists display and adhesive tape. In general, a bright white base film in a display can act as a diffusing or reflecting layer, and in an adhesive tape it gives a clean, uniform white backing for printing or marking (general explanations, not from this datasheet). The datasheet does not describe the exact role of the film in either product, so confirm suitability with your own design and test samples.
How It Differs from Neighboring Grades
- Toray Lumirror E63 PET Film is also white, in 50 and 75 um, but it is a low density, one-side treated film for print receivers. At 75 um, E63 shows an optical density of about 0.93, against about 0.36 for X20, so X20 lets considerably more light through. Surface resistivity for E63 is lower (about 3.8E+11 to 5.0E+11 ohm per square) because it is described as anti-static.
- Toray Lumirror E60L PET Film is a microvoided, very low density white film at 188 um for LCD back light use, with an optical density of about 1.3 and a whiteness index of 100 percent. X20 is a lower-opacity, pigment filled alternative, and its datasheet does not list a whiteness index.
What the Datasheet Does Not Say
- The values are typical data under specific test conditions and are not limiting specifications, as the datasheet itself notes.
- No whiteness index, gloss, haze, light transmittance, tensile modulus, surface tension, or thickness tolerance are listed.
- There is no test data to back up the color stability claim.
- Only two surface resistivity values are given for three thicknesses.
- Only 150°C shrinkage is given.
Questions Buyers Ask About Toray Lumirror X20 PET Film
What is Lumirror X20?
A pigment filled white film with low opacity and color stability, described as a brilliant white film.
What thicknesses does the datasheet cover?
38, 75, and 125 um.
How opaque is it?
The datasheet lists optical density of about 0.33 at 38 um, 0.36 at 75 um, and 0.53 at 125 um.
What applications does the datasheet list?
Display and adhesive tape.
Can I buy Toray Lumirror X20 PET Film from Jinlu Film?
Yes. Jinlu Film supplies Toray Lumirror X20 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
- Toray Lumirror X44 PET Film: the highest-gloss grade of the X42, X43, X44 matte trio
- Toray Lumirror X43 PET Film: a direct matted film from 12 to 150 um for hot stamping foil and releasing
- Toray Lumirror X10S PET Film: a low oligomer, heat-rated film for Class B motor insulation
- Toray Lumirror P60 PET Film: a one-side corona treated film for snack and retort pouch packaging
- Toray Lumirror P52 PET Film: a 12 um pretreated film for metallizing, compared with P525
Sourcing White Film for Displays and Tapes
Jinlu Film supplies Toray Lumirror X20 PET Film, along with comparable white polyester film grades, including domestic alternatives, for display and adhesive tape applications. Tell us your product, thickness, and the opacity you need, and contact us for technical data, samples, or a factory quote.
Source: Toray’s publicly available Lumirror X20 technical data sheet (typical values). Please refer to the latest official version. Lumirror, Toray, and related names are trademarks of their respective owners. This article is an independent explanation for reference only.
