When I first started handling maintenance orders for commercial elevators, I assumed the prep work was the same for every part. Stainless steel, aluminum, wood—just measure, order, install. Three years and one very expensive mistake later, I've learned that assumption was completely wrong.
In late 2022, I was tasked with replacing a damaged section of a KONE elevator door frame. The original had a decorative milk glass panel. My job: find a matching replacement, order it, get the frame prepped, and move on. Simple enough.
I ordered the milk glass. I ordered the door frame trim. I checked the dimensions against the existing frame. Everything looked good on my screen. What I completely overlooked was the specific type of paint and finish on the KONE door frame.
The result: $890 in wasted materials (the milk glass itself plus the frame section) and a 3-week delay. When we went to install, the paint on the new frame section chipped immediately—tiny flakes around every screw hole. It didn't match the factory finish, and the building manager rejected it on sight. Straight to the trash.
That's when I created my pre-order checklist for any elevator part that touches a KONE door frame, especially when milk glass is involved. Here it is.
Step 1: Confirm the Frame Material and Finish Code
This is the step I skipped. I saw "door frame" in the KONE parts catalog and assumed the finish was standard. It wasn't.
What to do:
- Locate the KONE frame serial number or spec tag. It's usually inside the door frame or on the header.
- Match the finish code listed against the KONE official materials list. They use specific codes for powder coat, anodized aluminum, and custom paint.
- If you're ordering milk glass, the frame's finish color and texture must match the existing frame exactly. KONE frames aren't just one shade of 'elevator grey'.
I've since found that KONE uses at least four different standard off-white shades across different production years. My mistake was ordering a 'standard white' frame section for a 'bone white' frame. The difference was subtle on the spec sheet—obvious when placed side-by-side.
Step 2: Verify Milk Glass Compatibility with the Frame Paint
This is the part most people ignore. Milk glass is not like regular glass. Its chemical composition and the way it's cut can interact with certain paints and sealants.
What to do:
- Ask your supplier if the milk glass is "paint-safe" for the specific frame coating. Some milk glass edges are treated with a chemical that can react with standard elevator-grade powder coat.
- Check the KONE maintenance manual for that specific model. Some KONE frames require a primer layer before installation if using non-OEM milk glass.
- Do a test fit on a scrap piece of frame (if available) before committing to the full assembly.
On my doomed order, the milk glass itself was fine. But the edge sealant I used (standard silicone) reacted with the KONE frame's paint, causing micro-blisters that looked exactly like chipped paint. The building manager assumed we'd dropped the frame during installation. I learned the hard way that 'compatible' doesn't mean 'optimized for this application.'
Step 3: Check the Paint Application Method
This is where the real cost lives. Not all paint is applied the same way. A factory-applied KONE coating is different from a field repair touch-up, and ordering a pre-painted part requires you to know exactly how that paint was applied.
What to do:
- Determine if the part is factory-painted or field-painted. KONE factory finishes are applied in a controlled environment with specific temperatures and curing times. A third-party pre-painted part may use a different process.
- Ask for the application method: powder coat, liquid paint, or UV-cured. Each reacts differently to screw holes and handling. Powder coat is tough but can chip if not cured at the right temperature.
- Request a paint sample chip if you're matching an existing frame. Don't rely on color codes alone.
When I ordered my replacement frame section, I didn't ask about the application method. The supplier used a liquid paint that looked perfect in the warehouse. But when we drilled screw holes for the milk glass mounting brackets, the paint fractured around every hole. The factory KONE finish is powder-coated—it flexes slightly. The replacement was not.
Step 4: Inspect the Part Upon Arrival (Before Installation)
I now do this every time, without fail. It's saved me twice already.
What to do:
- Unbox and inspect in good lighting within 24 hours of delivery. Look for any paint defects: chips, bubbles, scratches, or uneven texture.
- Check the edges where the milk glass will sit. Any paint defect in that channel will telegraph onto the glass surface over time.
- Document everything with photos. If there's a defect, you need a clear record for the supplier or KONE warranty claim.
On one recent order, I caught a hairline crack in the paint along the bottom edge before installation. It wouldn't have been visible until the milk glass was in place, at which point we'd be stuck with a non-returnable custom part. A quick call to the supplier, and they sent a replacement with the correct powder coat. Total delay: 2 days. Total cost avoided: roughly $1,200.
Final Thoughts: Why This Checklist Saves You Money
The $890 mistake taught me that 'looks right' isn't the same as 'is right.' Every time I skip a step because I'm in a hurry, I remember that chipped paint and the building manager's phone call. Now I run through these four checks on every KONE door frame order, especially when milk glass is involved.
A few things to keep in mind:
- Don't assume your supplier knows the KONE paint spec. Ask directly.
- Milk glass is not a 'one size fits all' material. Its interaction with the frame is more important than its dimensions.
- The cheapest frame section isn't the best deal if it doesn't match the existing finish. Total cost of ownership includes rework and delay.
So glad I started using this checklist. Almost ordered a standard powder coat frame last month (which would have been wrong) but caught it during Step 1. Dodged a bullet—and I know exactly how close it was.
