Types of Food Grade Plastics

This page will cover three different types of food grade plastics you are likely to come across in your plastic bucket journeys. There are other food grade plastics such as PET, PCP and the increasingly unpopular BPA not covered here, but they are usually not used to make buckets.

HDPE or High Density Poly Ethelene plastic has an amazing temperature range, and is considered safe for short periods up to 248°F (120°C) or for long periods up to 230°F (110°C.) Since boiling water never gets above 100°C, this means that anything boiling and below is safe for a food grade bucket.

It’s important to make sure the bucket you are storing hot liquids in is HDPE however, as a similar plastic, low density polyethelene, actually has a temperature limit of 176°F (80°C) which is well below boiling. To see which type of plastic you are working with, just check the small recycling symbol usually found on the bottom of the bucket. HDPE is the one you want to see!

Sometimes I find a polypropelene or PP plastic bucket used for food, usually smaller containers that are thinner and less rigid than standard five gallon buckets. Polypropene has the highest temperature rating of all, but is considered a low to moderate health hazard by the Environmental Working Group.
High Density Polyethelyne

  • 230°F  temperature limit
  • Usually food grade
  • Recycle symbol 2
  • Example: Most five gallon buckets

 

 

Low Density Polyethelyne

  • 176°F temperature limit
  • Usually food grade
  • Recycle symbol 4
  • Example: 18 gallon rubbermaid totes

 

 

Polypropelene

  • 275°F temperature limit
  • Usually food grade
  • Recycle symbol 5
  • Can release a mild or moderate toxin
  • Example: Yogurt containers

6 thoughts on “Types of Food Grade Plastics

  1. All of my wine primary fermentation buckets are labelled PP (5) since it is stated that this material can release a mild or moderate toxin should I be concerned?

    • It won’t kill you, but I would avoid dumping boiling wort into it. Cool your brew pot before emptying into your pails.

      And of course, glass is always best if you’ve got it. We use glass as a primary.

  2. I’m making a cheese press using PVC sewer pipe type. There is not a recycling symbol on the pipe. Thanks for your feedback. Tim

  3. I want to make my own 4 ft garden, but I’m concerned about what types of buckets and PVC piping would be safe for edible plants and a worm/food scrap composting tube. I know most of the questions here deal with wine/beer making, but I hope you can give me some ideas. Im learning that all ‘food grade plastics’ are not the same, lol.

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