ShinechipMirror Defogger Pads & Demister Pads
A defogger pad keeps part of the bathroom mirror clear straight after a shower, a feature your customers notice the first time they use it. Source the pads and the switches that control them from one supplier.
Defogger pads keep part of a bathroom mirror clear when the room fills with steam, so the user can see their face straight after a shower. Mirror makers bond the pad to the back of the glass and switch it from the mirror's touch panel or a relay. This page lists square, rectangular, round and custom pads with a power density of 1.5-2.5 W/dm² and a listed temperature rise of 10-20 °C. The mirror switches with a defogger key that control them are listed under Mirror Touch Switches and Mirror Switches with Built-in Power Supply.
TSP-3030TSP-3030 Mirror Defogger Pad, 300 x 300 mm
TSP-Defogger Pad-ITSP-Defogger Pad-I Mirror Heating Pad, 300 x 400 mm
TSP-D30TSP-D30 Round Mirror Defogger Pad, 300 mm
TSP-Defogger PadTSP-Defogger Pad Custom-Size Mirror Heating Film
Why buyers source mirror defogger pads from us
Square, rectangular, round and custom pads, with a power density of 1.5-2.5 W/dm² and a listed temperature rise of 10-20 °C.
Mirror switches with a defogger key and relays let you control the pad and the light from one touch panel.
Pads for AC 230V, AC 120V, DC 12V or DC 24V supply. Standard items from 2 pcs, shipped in 7-15 days.
How to choose
- Pick a pad size that covers the area that must stay clear, usually the face area of the mirror.
- Match the pad voltage to the mirror: AC mains, or the same 12V / 24V DC as the LED driver.
- Switch it with a mirror touch switch that has a defogger function, or with a relay.
Building a bathroom mirror? See the complete Bathroom Mirror kit →
Send these details for a quote
- Mirror size and shape, with the area that must stay clear marked on a drawing
- Pad supply voltage: AC 230V, AC 120V, DC 12V or DC 24V
- How the pad will be switched: defogger key on the mirror switch, relay or separate switch
- LED driver rating and strip load, if the pad shares the low-voltage supply
- Lead length and connector type at the pad
- Glass thickness, for the matching touch switch
- Quantity per pad size
Related articles
How it is wired
How do I work out the power of a defogger pad?
Pad power is power density multiplied by area. Work in square decimetres: 1 dm is 100 mm, so a 300 x 300 mm pad is 3 dm x 3 dm = 9 dm². At the listed 1.5-2.5 W/dm², that gives 9 x 1.5 = 13.5W up to 9 x 2.5 = 22.5W for the TSP-3030.
The 300 x 400 mm TSP-Defogger Pad-I is 3 dm x 4 dm = 12 dm², which works out at 18W to 30W; its listing gives a 25W maximum. For the 300 mm round TSP-D30, area is π x radius², so π x 1.5² ≈ 7.07 dm², or about 10.6W to 17.7W; its listing gives 18W. Use the figure on the pad's label for final sizing.
Current then follows from the supply voltage. A 25W pad draws 25W ÷ 12V ≈ 2.08A on 12V DC and 25W ÷ 24V ≈ 1.04A on 24V DC, so the low-voltage wiring and the switch output must carry that current.
How is a pad wired with the mirror light?
The pads are listed for AC 230V, AC 120V, DC 12V or DC 24V. Order the pad for the voltage that is already on the mirror. On a mirror with a 12V LED driver, a 12V pad can share the driver as long as the driver is sized for the strip plus the pad. On a mains-wired mirror, an AC pad avoids loading the LED driver.
The pad leads are listed at 20 cm, and some pads have a connector. Plan the route from the pad to the switch or relay before the backing is fitted. Mains wiring must be done with the power off and by a qualified electrician.
Most of our mirror switches with a defogger key, such as the TD103 / TD103D, MTD-B02 and NBI-06, take 12V DC; the FWS-6D takes 24V DC and the TSP-003 is listed for 110V / 220V input. Check whether the switch's rated load covers the light output only or the light and pad together, and ask us if the product page does not say.
Where should the pad sit on the mirror?
Centre the pad on the area the user looks at, usually the face area at standing height, and keep it clear of the sensing pad of the touch switch and of any display window. Bond the whole pad surface to the glass so there are no air pockets, which cause uneven heating.
On round mirrors, the TSP-D30 round pad follows the mirror shape. For other sizes, the custom TSP-Defogger Pad is listed as made to size; send the mirror drawing with the clear area marked.
What mistakes should be avoided with defogger pads?
Ordering a pad at the wrong voltage is the costly one: a DC pad on mains will fail, and an AC pad on a 12V supply will not warm the glass. Other errors are sizing the LED driver for the strip only, routing pad leads where they press against the switch, and placing the pad over the clear window of a clock display.
Compare by type
| Type | How it is triggered | Suited to | Typical models |
|---|---|---|---|
| Square defogger pad, 300 x 300 mm | Switched by a defogger key or relay | Rectangular mirrors with a central face area | TSP-3030 |
| Rectangular pad, 300 x 400 mm | Switched by a defogger key or relay | Taller mirrors needing a larger clear area | TSP-Defogger Pad-I |
| Round pad, 300 mm | Switched by a defogger key or relay | Round mirrors | TSP-D30 |
| Custom-size pad | Switched by a defogger key or relay | Non-standard mirror shapes and sizes | TSP-Defogger Pad |
| Touch switch with defogger key | Separate touch key for the pad | Low-voltage mirrors with a 12V or 24V driver | TD103 / TD103D, MTD-B02, FWS-6D, TQ-303SW |
| Switch with defogger and display | Touch keys plus clock or temperature display | Vanity mirrors with a time readout | TSP-002-2412, TS-F-03 / TS-F-04, NBI-06, TSP-003 |
Compare mirror defogger pads
| Model | Input | Max load | Range / size | MOQ |
|---|---|---|---|---|
| TSP-3030 Mirror Defogger Pad, 300 x 300 mm | AC 230V / AC 120V / DC 12V / DC 24V | 1.5-2.5 W/dm² | 300 x 300 mm | 2 pcs |
| TSP-Defogger Pad-I Mirror Heating Pad, 300 x 400 mm | AC220V/AC110V / 12V / 24V | 25W | - | 2 pcs |
| TSP-D30 Round Mirror Defogger Pad, 300 mm | AC220V/AC110V / 12V / 24V | 18W | - | 2 pcs |
| TSP-Defogger Pad Custom-Size Mirror Heating Film | - | 1.5-2. 5W/dm² | - | 2 pcs |
Values from our Alibaba.com listings. Ask us to confirm the exact version before ordering.
Frequently asked questions
How does a mirror defogger pad work?
It is a thin heating film bonded to the back of the mirror. Warming the glass a few degrees above the room stops steam condensing on it.
Can pads be made to custom sizes?
Yes. Send the mirror size and the area to keep clear and we propose a pad size.
Which switch turns the pad on?
Use a mirror touch switch with a defogger output, or a relay wired to the mirror light. The defogger switch models are listed on this page.
Can the defogger pad share the LED driver?
Yes, on a low-voltage mirror, if the pad voltage matches the driver output and the driver is rated for the strip load plus the pad power. Add both figures, then choose the driver.
Does the pad work on any glass thickness?
The pad listings do not state a glass thickness range; ask us if your glass is unusually thick. The thickness limit that matters day to day is on the touch switch, which is listed for 1-5 mm glass on most of our mirror switches with a defogger key.
Need a mirror defogger pad for your project?
Send the switch type, voltage, load and quantity, or a photo of the switch you use today. We reply with model options, MOQ, price and lead time.