Chemical Forums

Please login or register.

Login with username, password and session length

Sponsored links

Pages: [1]   Go Down

Author Topic: Question about plastic storage box (not for food)  (Read 2130 times)

0 Members and 1 Guest are viewing this topic.

kenny1999

  • Regular Member
  • ***
  • Mole Snacks: +0/-4
  • Offline Offline
  • Posts: 85
Question about plastic storage box (not for food)
« on: November 03, 2018, 04:12:08 AM »

Hello

I'd like to know, I am purchasing a large amount of plastic storage box (not intended for food), made in China. What are they usually made of ?
The storage box is transparent in color. When I open them new, I smell a sudden "plastic" smell coming out. But the smell goes away quickly. Is it safe or not good?
Logged

mike5

  • Guest
Re: Question about plastic storage box (not for food)
« Reply #1 on: November 03, 2018, 04:58:54 AM »

Hi Kenny. Generally speaking, the international packaging community has settled on 3 types of materials, namely polyethylene, Acrylonitrile butadiene styrene(ABS) and polystyrene. The fact that it is translucent indicates that it may come from the ethylene-polymer group, in which case, you could expect that your boxes would be made from low density poly ethylene (LDPE). There are quite a few ways to identify plastics
« Last Edit: November 03, 2018, 11:11:10 AM by Borek »
Logged

kenny1999

  • Regular Member
  • ***
  • Mole Snacks: +0/-4
  • Offline Offline
  • Posts: 85
Re: Question about plastic storage box (not for food)
« Reply #2 on: November 03, 2018, 05:55:17 PM »

Hi Kenny. Generally speaking, the international packaging community has settled on 3 types of materials, namely polyethylene, Acrylonitrile butadiene styrene(ABS) and polystyrene. The fact that it is translucent indicates that it may come from the ethylene-polymer group, in which case, you could expect that your boxes would be made from low density poly ethylene (LDPE). There are quite a few ways to identify plastics

Hi, from the label sticker on the box, it's made of "PP" . Wht does PP stand for? Is it a good plastic for container?

And I often see some plastic container advertised as "food grade" , is there any particular type of plastic used to make "food grade" box
Logged

Borek

  • Mr. pH
  • Administrator
  • Deity Member
  • *
  • Mole Snacks: +1628/-395
  • Offline Offline
  • Gender: Male
  • Posts: 24860
  • I am known to be occasionally wrong.
    • Chembuddy
Re: Question about plastic storage box (not for food)
« Reply #3 on: November 03, 2018, 10:35:53 PM »

Hi, from the label sticker on the box, it's made of "PP" . Wht does PP stand for? Is it a good plastic for container?

Most likely polypropylene. Check its properties in wikipedia.

Quote
And I often see some plastic container advertised as "food grade" , is there any particular type of plastic used to make "food grade" box

In general - no. Food grade means it is safe for storing food, many plastics fit (assuming they were prepared in a right way).
Logged
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info, PZWT_s1

kenny1999

  • Regular Member
  • ***
  • Mole Snacks: +0/-4
  • Offline Offline
  • Posts: 85
Re: Question about plastic storage box (not for food)
« Reply #4 on: November 04, 2018, 01:53:41 PM »

Hi, from the label sticker on the box, it's made of "PP" . Wht does PP stand for? Is it a good plastic for container?

Most likely polypropylene. Check its properties in wikipedia.

Quote
And I often see some plastic container advertised as "food grade" , is there any particular type of plastic used to make "food grade" box

In general - no. Food grade means it is safe for storing food, many plastics fit (assuming they were prepared in a right way).

They were prepared in a right way? Sorry what does that mean?

If they were prepared in a right way, what possible things could happen? Breaking into tiny pieces more easily? How about PP ? 
Logged

Enthalpy

  • Chemist
  • Sr. Member
  • *
  • Mole Snacks: +243/-54
  • Offline Offline
  • Posts: 2818
Re: Question about plastic storage box (not for food)
« Reply #5 on: November 05, 2018, 07:48:43 AM »

Some polymers from some families are allowed to store food. For instance some PP and PETP grades may be allowed.

Then, because some poisons can be noxious in minute quantities, just telling "Polyester" or PBTP or PETP isn't accurate enough. The whole manufacturing process of these polymers AND the parts must guarantee maximum amounts for potential hazardous compounds. This includes unmoulding lubricants for instance, dyes and so on.

So from the same provider, you generally have within a polymer family some grades that are allowed for food contact and others that are not. Then the transformer, which makes a pot from the granules, must work adequately too.
Logged

kenny1999

  • Regular Member
  • ***
  • Mole Snacks: +0/-4
  • Offline Offline
  • Posts: 85
Re: Question about plastic storage box (not for food)
« Reply #6 on: November 05, 2018, 08:16:48 AM »

Some polymers from some families are allowed to store food. For instance some PP and PETP grades may be allowed.

Then, because some poisons can be noxious in minute quantities, just telling "Polyester" or PBTP or PETP isn't accurate enough. The whole manufacturing process of these polymers AND the parts must guarantee maximum amounts for potential hazardous compounds. This includes unmoulding lubricants for instance, dyes and so on.

So from the same provider, you generally have within a polymer family some grades that are allowed for food contact and others that are not. Then the transformer, which makes a pot from the granules, must work adequately too.

Hi , what is and why is there unpleasant smell from the container made of PP ? is it toxic?
Logged

Enthalpy

  • Chemist
  • Sr. Member
  • *
  • Mole Snacks: +243/-54
  • Offline Offline
  • Posts: 2818
Re: Question about plastic storage box (not for food)
« Reply #7 on: November 11, 2018, 11:09:12 AM »

I can't guess. PP itself has zero odour. It may come from something used during production, or possibly from the lid, especially if this lid is soft.
Logged
Pages: [1]   Go Up
 

Mitch Andre Garcia's Chemical Forums 2003-Present.

Page created in 0.111 seconds with 19 queries.