So I always see these signs and numbers on plastic containers, what do they mean?
[Here’s a photo of those numbers/signs from something I just threw away.](https://imgur.com/K1krehk)
In: Chemistry
Mold cavity number, plastic material marking in Japanese, another in the western style (in this case Polypropylene “PP”, plus two date stamps.
The date stamps can be adjusted to reflect the day/month/year the item was manufactured in. If there is a problem it’s easier to track it back to a specific time the item was manufactured at.
The mold number shows what cavity the piece came out of. Let’s say every time your mold machine opens 10 of these items fall out. If each is marked with a number it’s easy to trace problems back to a specific mold cavity.
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