#polypropylene

Researchers advance solvent-based recycling for flexible plastics

Polypropylene and polyethylene are two durable and affordable plastics commonly used as packaging materials, snack wrappers, microwave containers, and other, usually flexible, plastic films. Their flexibility, however, makes them resilient to recycling processes, and these plastics often end up in landfills or leak into the environment. University at Buffalo researchers are leading efforts on a new, innovative way to repurpose these plastics through solvent-based recycling, or solvent purification. Their work has the potential to unlock for recycling millions of tons of plastics that are discarded or burned after use.

I washed their hair and was sooo happy to see it get visibly wet, meaning it's not polypropylene! Not even the tails!

(I made this list with fellow doll customizers and collectors in mind. Most information comes from the Monster High wiki. This master list will be updated as more dolls and information comes out.)

*had in first batch of dolls, now has non poly variants

^only streaks of poly, minimal usage

Clawdeen Wolf

Series 1 (first wave)*

Day Out*

Ghoul Spirit

Studio

Creepover Party*

Skulltimate Secrets: Series 1 (innovation)

Monsteristas*

Skulltimate Secrets: Series 2 (fearidescent)

Faboolous Pets

Skulltimate Secrets: Series 4 (monster mysteries)

Buried Secrets: Cozy Creepover

Buried Secrets: Scare-mester Style

Skulltimate Secrets: Series 6 (hauntlywood mysteries)

Buried Secrets: Haunted Dance

Buried Secrets: Courtside Fang-Out

Draculaura

Bite in the Park

Monsteristas

Skulltimate Secrets: Series 2 (fearidescent)

Skulltimate Secrets: Series 3 (neon frights)

Monster Fest (Fangtastic Rockin' Food Truck)

Skulltimate Secrets: Series 4 (monster mysteries)

Skulltimate Secrets: Series 5 (garden mystery)

Buried Secrets: Cozy Creepover

Buried Secrets: Scare-mester Style

Self-Scare Secrets

Buried Secrets: Concert Lurks

Vampsastic Scooter

Frankie Stein

Ghoul Spirit^

Creepover Party

Skulltimate Secrets: Series 1 (innovation)

Monsteristas

Skulltimate Secrets: Series 2 (fearidescent)

Skulltimate Secrets: Series 3 (neon frights)

Buried Secrets: Cozy Creepover

Buried Secrets: Scare-mester Style

Skulltimate Secrets: Series 6 (hauntlywood mysteries)

Buried Secrets: Courtside Fang-Out

Make-A-Monster Pet

Self-Scare Secrets

Cleo de Nile

Series 1 (first wave)*

Skulltimate Secrets: Series 2 (fearidescent)

Monster Ball*

Skulltimate Secrets: Series 4 (monster mysteries)

Buried Secrets: Cozy Creepover

Buried Secrets: Haunted Dance

Buried Secrets: Concert Lurks

Self-Scare Secrets

Lagoona Blue

Skulltimate Secrets: Series 2 (fearidescent)

Buried Secrets: Haunted Dance

Toralei Stripe

Skulltimate Secrets: Series 3 (neon frights)

Buried Secrets: Scare-mester Style

Buried Secrets: Courtside Fang-Out

Ghoulia Yelps

Skulltimate Secrets: Series 3 (neon frights)

Buried Secrets: Courtside Fang-Out

Twyla Boogeyman

Skulltimate Secrets: Series 3 (neon frights)

Skulltimate Secrets: Series 5 (garden mystery)

Buried Secrets: Haunted Dance

Buried Secrets: Concert Lurks

Abby Bominable

Series 1

Skulltimate Secrets: Series 4 (monster mysteries)

Fearbook

Self-Scare Secrets

Venus McFlytrap

Skulltimate Secrets: Series 5 (garden mystery)

Self-Scare Secrets

Catty Noir

Skulltimate Secrets: Series 6 (hauntlywood mysteries)

Spectra Vondergeist

Buried Secrets: Concert Lurks

Some MLP G3 have poly hair and many of them have crumbled.

(the pink fell apart when I touched it)

The fiber starts to break up into bits after a few years and it’s beyond irritating. Crumbling is different than standard breakage. Breakage tends to happen when a single fiber is pulled too hard and snaps.

Crumbling is notably different since by grabbing the hair and giving it a light tug you can pull out huge clumps in one go.

However

It would be dishonest to say that nylon hair never crumbles.

It seems to affect some colors more than others.

These are examples. The pony the hair is on doesn’t matter, it’s the color of the hair that is the common factor.

The absolute worst/most common color of nylon to crumble is Heart Throb’s pink. That goes the same for polypropylene. There’s something about the way this color is achieved that makes the hair more prone to crumbling.

Barnacle’s orange is pretty bad about it, but I haven’t encountered that nearly as often as Heart Throb pink.

Cupcake’s light blue has done it on me a few times.

These are less common crumbly nylons:

I have now had Goldilocks’s more orange color of hair (same color as Crumpet) crumble one time, and on a different Goldilocks, the more yellow hair crumbled leaving the orange behind.