Two different Underwriters Laboratories ratings appear on our tape spec sheets: UL 510 (published on our pages as "UL510 flame retardant") on six parts, and UL 130 on No.631S. If a drawing or customer specification names one of them, the tape has to carry that mark. This page lists which of our tapes carries which, with the construction, thickness and temperature class we publish for each.
Which of our tapes carries which rating
| Part | Construction | Thickness (mm) | Temperature class | UL mark |
|---|---|---|---|---|
| No.650S | Polyimide film / silicone | 0.05 | 200 C | UL 510 |
| No.560S | Aramid paper / silicone | 0.10 | 155 C | UL 510 |
| No.540S | Glass cloth / silicone | 0.18 | 200 C | UL 510 |
| No.570F | Acetate cloth / rubber | 0.25 | not published | UL 510 |
| No.8323 | Rolled copper foil / conductive acrylic | 0.07 | not published | UL 510 |
| No.833 | Aluminium foil | 0.08 | not published | UL 510 |
| No.631S | Polyester (PET) film | 0.05 | 130 C | UL 130 (film also UL 746) |
Every figure above is copied from that product's own page. Where we do not publish a temperature class we write "not published" rather than estimate it.
What the two marks mean when you are choosing
- The spec says UL 510 - take 650S, 560S, 540S, 570F, 8323 or 833, then use the temperature class to narrow it: 200 C for 650S and 540S, 155 C for 560S.
- The spec says UL 130 - No.631S is the only tape in the range carrying it: 0.05 mm, 130 C.
- No UL clause, only a temperature - choose by class first, then by construction: polyimide and glass cloth for 200 C, aramid paper for 155 C, polyester for 130 C.
- Conductive or shielding work - 8323 rolled copper foil with conductive acrylic adhesive, or 833 aluminium foil; both carry UL 510.
Where the ratings come from
The standards are published by Underwriters Laboratories, not by us, and we do not restate their text. What we can state is which mark each of our tapes carries, the thickness we publish, and the temperature class. If a drawing calls out a clause number, send it over and we will tell you whether the tape on our shelf is tested to that standard.
Choosing between the two
With no UL requirement in writing, temperature and thickness matter more than the mark: 650S at 0.05 mm for tight masking, 540S at 0.18 mm where abrasion is the risk, 631S at 0.05 mm where 130 C is enough. The selection matrix puts all seven side by side.
Questions
Is UL 510 better than UL 130?
Neither is better - they are different test standards. What matters is which one your specification, drawing or customer asks for, and whether the tape you buy carries that mark.
Can I use No.631S where UL 510 is required?
No. 631S carries UL 130, not UL 510. Use 650S, 560S, 540S, 570F, 8323 or 833 instead.
Which tapes are both UL 510 and 200 C?
No.650S (polyimide, 0.05 mm) and No.540S (glass cloth, 0.18 mm).
Do you publish UL file numbers?
We publish the mark and the temperature class on each product page. If you need the file number for a submittal, ask and we will send what the manufacturer provides.