On Japanese chopsticks, "Polyester coating" = synthetic imitation lacquer.
It's not natural tree-sap lacquer (Urushi). It's a hard plastic paint that looks like lacquer.
How it's made
The wood (or bamboo / PBT) chopstick is dipped / sprayed with unsaturated polyester resin and then cured. It hardens into a very thick, hard, super glossy shell. Most modern gift-shop chopsticks that say "Polyester coating" or "Polyester Urethane" are this - Traditional Wakasa lacquer finish... coated with polyester urethane for durability and a glossy finish.
Polyester vs the other coatings you'll see:
|
Label |
What it really is |
|---|---|
|
Natural Lacquer / Urushi |
Real tree sap. Very hard, strong, insoluble and resistant to alkali, acid, salinity and alcohol when dry. Expensive, takes months to make, matte-deep luster, not dishwasher safe. |
|
Urethane coating |
Standard synthetic workhorse. Prized for being flexible, water-resistant, and typically dishwasher-safe. Softer feel than polyester. |
|
Polyester coating |
Hardest synthetic. Thicker than urethane, glass-like shine, very scratch and color-fade resistant. This is what you have. |
|
Acrylic Urethane |
Higher-end synthetic, harder than standard urethane and specifically formulated to ensure colors remain vibrant over time. |
Most cheap-to-mid range pretty chopsticks are Polyester or Polyester-Urethane mix - they give you that bright color and the seashell / pattern stays vivid.
Is it safe? How to care?
- Food safe: Yes, once fully cured it's food-safe for normal use.
- Dishwasher: Polyester is generally NOT dishwasher safe long term, unlike plain urethane. The high heat will make it crack and turn cloudy. Hand wash recommended unless it specifically says 食洗機対応.
- Heat: Don't leave in boiling soup pot, don't use as cooking chopsticks for deep fry. Coating will peel above ∼90-100°C.
- When to throw away: If you see chips at the tip where the wood is exposed, or white cracks in the coating - replace them. Bacteria gets under the coating.
If yours says Natural wood, Polyester coating it's the classic Japanese souvenir chopstick - beautiful but treat it gently, hand wash with soft sponge, and it will last years.