Cloth Diaper Delamination: What It Is, How to Prevent It, and What to Do When It Happens
What Is PUL, and Why Does It Matter?
Before we can talk about delamination, we need to talk about PUL (polyurethane laminate), the material that makes your cloth diaper waterproof.
PUL is a two-layer fabric: a polyester base bonded to a thin film of polyurethane. That bonded layer is what keeps moisture inside the diaper and off your baby. Polyester is used (rather than cotton) because it retains its stretch after lamination, essential for a good diaper fit on a wriggly, rolling, never-staying-still baby.
Delamination is simply those two layers separating. When the bond between the polyester and polyurethane breaks down, the waterproof barrier starts to fail.
What Causes Cloth Diaper Delamination?
The most common cause is heat. High temperatures, from hot wash cycles or a high dryer setting, weaken the bond between the layers over time.
Physical damage is the other culprit. Washing diapers alongside items with exposed zippers (bags, clothing, etc.) can create tiny punctures in the PUL. Water and regular wear gradually expand those micro-holes until the layers start to separate.
The good news: delamination is largely preventable.
Lil Helper recommends washing on warm or cold, and hanging your diaper covers to dry whenever possible. If you need the dryer, use low to medium heat, and pull the covers out after 10–20 minutes, since they dry much faster than inserts anyway. Never use dryer sheets or fabric softeners, which degrade absorbency.
How to Tell If Your Diaper Is Delaminated
Not sure if you're dealing with delamination? Here are the signs:
You're getting unexpected leaks, especially in areas that aren't the leg seams or top of the diaper.
The fabric sounds crinkly or feels rough, that texture change is often the first sign of separation. On pocket diapers and wet bags, you may be able to see a thin layer visibly pulling away from the shell. On AIOs, sound and feel are your best clues.
Still not sure? Do the pour test: Place the diaper cover flat and pour ¼ cup of water onto the center. If it leaks through within 30 seconds, the PUL is likely compromised.
Stages of Delamination: When to Keep Using, When to Retire
Delamination isn't always all-or-nothing. It progresses in stages:
*Stage 1 Tiny bubbles: Small areas of separation that don't affect performance yet. Keep using as normal; just monitor.
*Stage 2 Micro-cracks: Small fissures in the PUL that increase leak risk. These diapers are still usable, but best saved for around-the-house changes where leaks are less of an issue.
*Stage 3 Full separation: The polyurethane film has detached completely. The cover is no longer waterproof and shouldn't be used as a diaper.
What to Do With a Delaminated Diaper (Don't Toss It!)
A delaminated diaper isn't trash, it's a diaper with a new job.
Use it as a swim diaper. Swim diapers aren't meant to hold liquid, they're designed to contain solids only. A delaminated diaper works perfectly for swim lessons or pool days.
Turn it into something new. Crafty caregivers have repurposed delaminated diapers and wet bags into no-sew hair bows, keepsake quilts, and pet accessories. If you've been cloth diapering since the newborn days, a memory quilt is a beautiful way to hold onto those prints.
Quick Reference: Protecting Your PUL
To keep your PUL in good shape, wash on warm or cold, never hot, and hang your diaper covers to dry whenever you can. If you need the dryer, stick to low or medium heat. Always skip the dryer sheets and fabric softeners, and wash your diapers with similar items rather than anything with exposed zippers, which can puncture the PUL over time.
Still Have Questions About Your Diapers?
If you're noticing leaks and aren't sure whether it's delamination, a fit issue, or something else, we're here to help. Reach out to our team at delight@lilhelper.ca.
