Quick answer
A Melteca kitchen kept dry usually outlasts its ten-year limited warranty by a wide margin, because the melamine face is not what gives out. Laminex's own data sheet has Melteca passing two hours of steam with no cracks or blisters. The edges are the weak point. Once water gets past a lifted edgetape strip into the raw particleboard or MDF behind it, the core swells and that door is finished. Getting another decade means 2mm edgetape rather than 1mm at the sink and dishwasher, every exposed substrate sealed, and nobody spraying cleaner at the doors.
Key points
- Laminex rates the Melteca face for two hours of steam with no cracks or blisters, so the surface is almost never your problem.
- The same sheet is blunt about the core: the substrate must not contact any liquid, and exposed substrate must be sealed before service.
- Melteca is specified with 1mm or 2mm edgetape, and the 2mm only earns its keep next to water.
- The ABS-versus-PVC debate is imported noise — Laminex specifies "PVC or ABS" and treats both identically.
- Jif, oven cleaner and scourer pads are on Laminex's do-not-use list, and spraying cleaner at a door runs it into the joint you need dry.
The face passes every test. The glue line lets go.
Pull open the cupboard under the sink in a ten-year-old Papakura rental and you'll see the argument in four seconds. The doors above it are still doors. Tired, a colour nobody would pick now, but flat and sound. Then look at the door beside the dishwasher. The bottom rail has swollen like a wet biscuit, the edgetape has curled off, the board behind has gone soft and dark. One cabinet is dying. The other nineteen are fine.
That pattern repeats across almost every portfolio we service, which is why "the kitchen's had it" is usually wrong. This is melamine-faced board — Melteca, in Laminex NZ's language, and what most Auckland cabinetry is made from. Not your benchtop, which runs on its own clock. Not hinges and runners, which are consumables. If the carcasses are sound, replacement is a decision you can defer honestly rather than just postpone.
The face is not what fails
Melteca is a melamine-impregnated overlay bonded to a particleboard or MDF core under heat and pressure. The resin cures as it goes, which is why the finish is hard rather than painted on. Laminex publishes the test data.
| Property | Test method | Result |
|---|---|---|
| Steam resistance | Steam for 2 hours (AS/NZS 4266.23) | No cracks or blisters |
| Resistance to staining | Liquid agents for 16 hours (ISO 4586) | No visible marks |
| Resistance to dry heat | 180°C for 20 minutes (AS/NZS 4266.26) | No cracks |
| Resistance to cracks | 70°C oven for 24 hours (AS/NZS 4266.24) | No cracks |
| Resistance to wear | Taber Abraser (AS/NZS 4266.20) | Patterns >150 cycles to 50% |
Read that steam line again, because it undoes most of what people believe about melamine. Two hours of steam, on the face, no blistering. No kitchen in Manurewa does that to a door front. A tenant reporting "the melamine is peeling" is describing an edge.
The edge is what fails, and Laminex says so in writing
The interesting reading is not the performance table. It is the limitations page. Laminex states the Melteca substrate must not come into contact with any liquid, and that failure to keep it dry will affect the panel's performance. Under design considerations: any exposed substrate must be sealed before service. Elsewhere: Melteca resists fungal decay only while moisture content stays under 18 per cent.
Stack those three sentences and the manufacturer has told you how its own product dies. The face is armour. The core is a sponge with a ten-year warranty on it. Everything between a serviceable kitchen and a skip bin is whether water can get from face to core, and there are only a handful of routes.
The spec line that decides it: 1mm or 2mm
Melteca's data sheet gives the edge finish as 1mm or 2mm edgetape. That is the whole menu. What Laminex stocks lines up: preglued tape at 2mm thick in 21mm and 33mm widths, suiting 16mm and 18mm board, plus 1mm in wider strips for panel work. If someone says they run 3mm on Melteca, ask to see it. The supplier doesn't specify it.
The 2mm is worth having, and worth having in a targeted way. A thicker strip gives more glue-line area, takes a proper radius when trimmed instead of a knife-sharp arris, and survives a vacuum head without chipping to bare board. But 2mm across a whole kitchen is money spent where nothing was going to happen. The pantry door is not at risk. The sink base and dishwasher return are.
Skip the ABS-versus-PVC argument entirely. Search it and you'll be told ABS is the premium choice, or that PVC handles moisture better, usually by an overseas edgebanding manufacturer with an inventory position. Laminex NZ's position is duller and more useful: Melteca edges "should be finished with a PVC or ABS edgetape solution", and the care sheet treats PVC, ABS and Laser tape identically. The company that makes the board and sells the tape doesn't think chemistry is the deciding variable. Glue matters more. Banders run either an EVA hot melt or a PUR, and PUR is understood in the trade to give a more moisture-tolerant bond once cured. We know of no NZ data quantifying that on Melteca. Ask which one runs through their bander.
| Cabinet | Real exposure | Worth the 2mm? | Also do this |
|---|---|---|---|
| Sink base | Splash, drips, slow leaks | Yes | Seal every drilled hole; renew the silicone |
| Dishwasher return | Vented steam each cycle | Yes | Check it vents forward, not sideways |
| Pantry and fridge run | Dust | No | Nothing. Leave it alone |
| Kickboards | Mops, vacuums, wet floors | Yes | Never wet-mop hard against them |
The dishwasher is the actual villain
The mechanism is mundane. A dishwasher finishes and dumps a load of steam. If it vents sideways, or someone yanks the door open the moment it beeps, that steam goes straight at the vertical edge of the cabinet beside it. Twice a day for eight years is a very long steam test on a joint rather than a surface. The face shrugs it off. The glue line doesn't.
Cooking steam is the same story with a slower fuse. A rangehood that recirculates through a charcoal filter pulls grease out of the air and puts the moisture straight back in the room, which is why ducting it outside matters more than the badge on the front. In a tenancy it isn't optional: under the Healthy Homes ventilation standard a kitchen needs an extractor venting outdoors, and fans installed after 1 July 2019 need a minimum diameter including ducting of 150mm, or an exhaust capacity of at least 50 litres per second. Getting that right protects your compliance position and your cabinetry at once.
The care regime that genuinely matters
Laminex's care sheet is one page, and most of it covers stain removal, which is not your problem. The two lines that matter are almost thrown away. Use a soft cloth. And: apply cleaning products to the cloth rather than directly onto the product.
That second one is this whole article in eleven words. Spray a cleaner at a door and gravity takes it down the face, where nothing will happen, to the bottom rail, where it sits in the joint between edgetape and board and wicks in behind the strip. Not once. Twice a week for years, in the spot already taking dishwasher steam.
Pin the banned list up too. Laminex names Jif, Ajax, Chemico, Brasso, oven cleaners, neat Janola, wire wool, scourer pads and sandpaper. Each is abrasive enough to dull the melamine, and a dulled surface holds dirt, gets scrubbed harder, dulls further. If a mark won't shift, the sheet allows Handy Andy or Janola diluted one part to three.
What the warranty actually buys you
Melteca carries a ten-year limited warranty, and the data sheet states it meets the durability requirements of Building Code clause B2.3.1(c). Worth knowing what that clause is. B2.3.1(c) is the five-year band, covering elements easy to access and replace, where failure would be easily detected in normal use. Fixtures. Your kitchen. Five years, considerably less than most landlords assume.
MBIE is clear that durability and warranty are different animals: its guidance says a product warranty does not mean the product will necessarily be durable or last a certain number of years, only that it helps repair or replace it when there are problems. Laminex's wording is conditional in the same spirit — no liability where its conditions on use and maintenance haven't been met. What a kitchen warranty covers is narrower than the number suggests.
Two cabinets decide the life of the whole kitchen.
What goes wrong
The failures we get called to, roughly in the order we see them across South and West Auckland stock.
- Cleaner sprayed at the door instead of the cloth. It runs down, sits in the bottom edge joint, wicks behind the strip. The most common cause we see, and free to fix.
- The unreported leak. A weeping mixer tail destroys a sink base in one tenancy, and nobody says a word until the door is visibly swollen.
- Cut edges never sealed. The plumber drills the sink cabinet, someone scribes a filler on site. Raw substrate that Laminex says must be sealed before service.
- Steam mops, and wet-mopping the kickboards. A steam mop injects pressurised vapour into the exact joint you need dry.
- Standard board where MR should have been. On a value job the sink base gets the same board as the pantry.
- Benchtop silicone never renewed. That bead lasts a few years, not the life of the kitchen, and when it fails water runs down the gable.
You can read a kitchen's whole history off the bottom 100mm of the door beside the dishwasher. Everything above that line is cosmetics.
Triaging a kitchen you already own
Press the bottom rail of every door with your thumb, hard. Sound board doesn't give. If it gives, or the edgetape has a lip you can catch a fingernail under, that door is done — water is already in it, and re-taping conceals a swollen core rather than fixing it. In most ten-year-old rentals two or three fail, and always the same two or three.
That count is your decision. Two or three dead doors on sound carcasses is maintenance: fix the leak, replace those doors, seal the drilled holes, renew the silicone, adjust the hinges. You've bought years for the price of a callout. If the gables and bases are swollen rather than just the fronts, it flips — putting new doors onto rotten carcasses is money you spend twice. Full replacement in a rental starts in the lower five figures plus GST, so the honest test is whether the carcasses have another decade in them, not whether the doors look dated. Dated is not a defect. Across a dozen units, one inspection pass lets you sequence the kitchens that need work first.
What to ask before you sign
- What thickness is the edgetape, and on which cabinets? "2mm to the sink and dishwasher, 1mm elsewhere" is a good answer. "Standard" is not.
- Standard or MR substrate under the sink? Get it on the quote, not agreed in an email.
- EVA or PUR through your edgebander? You're testing whether they know, as much as which it is.
- Who seals the exposed substrate after the plumber has drilled it? If the answer is vague, it's nobody.
- Is the edgetape colour-matched, or close enough? Close enough reads cheap for fifteen years.
- Does the warranty cover the edging, or only the board?
Frequently asked questions
How long does a Melteca kitchen last in a rental?
Laminex gives Melteca a ten-year limited warranty and states it meets Building Code clause B2.3.1(c), the five-year band for fixtures that are easy to access and replace. A kitchen that stays dry usually runs well past both, because the melamine face doesn't wear out in normal domestic use. The variable isn't time, it's water — a cabinet next to a slow-leaking waste can be finished inside two years.
Can you replace the edgetape on an existing Melteca door?
It can be done, and it's occasionally worth it on a large end panel. On a standard door it usually isn't, because by the time a strip has lifted, water has generally already been into the substrate behind it, and re-taping only hides the damage. Press the bottom 100mm firmly with your thumb — if it gives, the core has gone and the door needs replacing.
Is ABS edging better than PVC for a kitchen?
Laminex's Melteca data sheet says the edges should be finished with a PVC or ABS edgetape solution, and its care sheet gives identical instructions for PVC, ABS and Laser tape, so the manufacturer treats them as equivalent. Most ABS-versus-PVC content online is imported from overseas edgebanding marketing. The variables that change outcomes are thickness, the adhesive, and whether exposed substrate was sealed.
What cleaning products ruin Melteca?
Laminex names them: Jif, Ajax, Chemico, Brasso, oven cleaners, neat Janola, wire wool, scourer pads and sandpaper. All are abrasive enough to dull the melamine, and once dulled the surface holds dirt and gets scrubbed harder still. The bigger everyday mistake is spraying cleaner at the door — Laminex says to apply it to the cloth instead, because spray runs down and pools in the joint you need dry.
Should I specify moisture-resistant board under the sink?
Melteca is available on several substrates including Superfine MR particleboard and Lakepine MRZero, so the option exists, and over two or three cabinets it's a minor line on a quote. It's worth specifying for the sink and dishwasher run on any new kitchen. Be clear what it buys you though: MR board survives an incident, not a permanent leak.
Get a straight answer on your kitchens
We build in our own workshop in East Tamaki and turn out ten-plus kitchens a week, most of them Melteca on Laminex NZ board, plenty into rentals where somebody lives with the spec for fifteen years. That volume is why the edging conversation isn't theoretical for us. We see which cabinets come back.
Send your unit count and a rough scope — or photos of the doors that failed the thumb test — and you'll get a trade-priced number back inside 24 hours, plus an honest read on whether you're looking at three doors or a kitchen. If you're specifying from scratch, the same logic drives which materials survive a tenancy. No showroom, supply and install under one contract and one invoice, 23 years and 2,000-plus kitchens behind it.