PET and HDPE plastics are very popular for manufacturing bottles and jars. However, understanding why to use each plastic type is very important to many brands and some consumers.

Within this article, we will explore, why and how to compare each plastic type.

PET Plastic Bottles

PET is also known as PETE or Polyester. PET stands for Polyethylene Terephthalate and is mostly used for the manufacturing of plastic bottles for liquid or beverage consumption. PET is also used for many disposable plastic containers that are also used for ready made or frozen foods. PET is popular because it provides a sound oil barrier which helps with chemicals attacking the plastic. PET can also be very clear plastic and can look like glass once set to its desired shape. PET can also be colour matched to be any colour.

Temperature range

PET bottles do not have as high of a temperature resistance (less than 131°F) as HDPE. PET containers can also handle cold temperatures of about -40°F.

PET plastic bottles

HDPE Plastic Bottles

High-density polyethylene (HDPE) or polyethylene high-density (PEHD) plastic is one of the most common plastics used in manufacturing, HDPE is known for its durability and strength. While not as clear as PET plastic, HDPE bottles and containers can be translucent so you can to see your product inside the bottle. This type of plastic can also be colour matched and is popular in white.

Temperature Range

HDPE bottles and containers also are able to withstand colder and freezing temperatures very well (-110° F) and higher temperatures moderately well near 167°F.

hdpe-plastic-bottles

What Are The Diversities Between PET & HDPE

Understanding the diversity of different plastic types is one thing, but what are the advantages and disadvantages of each plastic type. Here is a stats table to help make up your mind.

MATERIAL PROPERTIES HDPE PET
RIGIDITITY 3 4
IMPACT 3 2
MOISTURE BARRIER 3 3
GAS BARRIER 1 3
STRESS CRACK RESISTANCE 2 5
CLARITY Semi Opaque – 2 Clear – 5
COLD RESISTANCE -110°F – 4 -40°F – 3
HEAT RESISTANCE 167°F – 4 131°F – 3
METHYL ETHYL KETONE RESISTANCE 3 3
MINERAL OILS RESISTANCE 4 3
ALCOHOL RESISTANCE 3 4
ESSENTIAL OIL BARRIER 2 3
WEAK ACID RESISTANCE 4 4
ACETONE RESISTANCE 3 1
ETHYL ACETATE RESISTANCE 3 3
HYDROGEN PEROXIDE RESISTANCE 5 3
SODIUM CHLORIDE RESISTANCE 4 5

Score Card (KEY)

Excellent = 5
Very Good = 4
Good = 3
Fair = 2
Poor = 1

OVERALL SCORE HDPE PET
SCORE 51 53

As you can see there really isn’t much between each plastic type. However, you can pick a bottle that best suits your product type.
HDPE is a high-density plastic that is very stiff, has a good temperature resistance and a very good water vapour barrier. PET plastics are highly transparent in appearance, available in different colours, lightweight and tough against gases and liquids. PET is also highly resistant to diluted acids, oils and alcohols.

tall-family-bottles

Needs some help? Why not get in touch with one of our friendly account managers.

35 thoughts on “HDPE Bottles vs Pet Bottles

  1. Marcus Tay says:

    Any idea what would be a contributing factor as to why thicker fluids would flow down the sidewalls of a PET bottle quicker than the HDPE bottle?

  2. Raepak says:

    Hello Marcus, The plastic molecules are slightly packed closer together when making PET products. This causes the plastic to have smoother finish. This smoothness will allow liquids to run off the surface area quicker. Hope this helps…

  3. Jagannath Mishra says:

    Hi, can you comment which one is recommended for use in sampling bottle for aviation oils

    • Raepak Ltd says:

      Hello Jagannath Mishra. Thanks for getting in touch. HDPE or PET bottles could be suitable for aviation oil. We would recommend testing the oil in both bottle types. This would give you a better idea of which is best. Raepak offers a good range of HDPE stock bottles which are available for small and large orders. For any further advice please give one of our account managers a call.

    • Raepak Ltd says:

      Both plastic types are good for storing witch hazel oil. We would recommend testing both products. HDPE and PET bottles also come in different designs, have a range of price points and can look and feel distinctive to the touch. If you have any further queries please call one of the friendly account managers.

    • Raepak Ltd says:

      Both HDPE and PET bottles are capable of storing surfactant products. However, we strongly advise testing your product. If you have further queries please get in touch.

  4. Aman arora Kasliwal says:

    Please suggest me, weather I should go for HDPE or PET for Tahini (sesame paste) packaging, thanks.

    • Raepak Ltd says:

      Hello Joyce, PETE won’t leak any chemicals into the water contained within the bottle. The only way this could be possible would be if the plastic was put under very high temperatures, to the point where the PETE bottle started to melt.

  5. Paulius says:

    Hi there! I was wondering if HDPE is a good idea for storing hot coffee? And how it would change food safety if recycled?

    • Raepak Ltd says:

      Hello Paulius,

      HDPE plastic bottle can store hot coffee, however, we recommend a thicker set container and a suitable cover that will go over the bottle. This can help stop hands from being burnt which is better for health and safety standards. All HDPE containers are recyclable no matter the food content. The HDPE recycling process has a ‘washing’ system that separates the HDPE plastic from any foreign bodies.

  6. Amit says:

    Hello Interested to why HDPE bottles are used as a preferred packaging in most if the dairy fermented beverage such as laban (pH range 4.7-4.2) etc where as in Milk PET(pH 6.5-6.8) is preferred.Is there any technical reason or just a cost factor

    • Raepak Ltd says:

      Hello Amit,

      HDPE is great for keeping liquid products such as milk, safe, fresh and free from bacteria. The cost, recyclability factor and materials used to make HDPE is also considered for storing liquid products.

    • Raepak Ltd says:

      HDPE and PET bottles can store alcohol at this percentage just fine. However, we would complete extra tests to make sure it worked with your product.

    • Raepak Ltd says:

      Hello Shweta, Any HDPE or PET bottle could be used to store peanut butter. However, the bottle would need to be prepped for food storage. This would mean you would have to source a company with the correct certificates and the capability for sterile manufacturing.

  7. Barry says:

    Which one would be good to store epoxy resin, I hear it eats polycarbonate but not sure about PET. Normally epoxy resin (resin + hardener sold separately) come in HDPE but I wonder if PET would be suitable. Would you be able to comment?

    • Raepak Ltd says:

      Hello Barry, PET bottles should also be suitable, but we recommend testing with our manufacturing standards. If you would like further help? Please call one of the team members.

    • Raepak Ltd says:

      Hello Paulinus,

      Thanks for the question and we would love to help with an answer. PET is slightly more expensive, mainly due to the raw materials needed and consumer demand. PET has a clear, premium hard finish and is used for soaps, gels and quality products. HDPE has a larger demand, meaning the overall cost is slightly cheaper. HDPE bottles are used for lotions, shampoos, conditioners and other liquid products that allow the consumer to squeeze the bottle.

      I hope this helps.

    • Raepak Ltd says:

      Hello Ashfaque,

      Yes, you can store ozonated olive oil in pet bottles for long storage time, but we recommend you test your product to see what the effects are.

  8. James C Manning says:

    I am packaging a brine for resale and consumption that needs to be pasteurized. Which bottle is best for pasteurization?

    • Raepak Ltd says:

      Hello Jim,
      It depends on what you need to sterilize it for? If it’s for a cosmetic product we would recommend washing with antibacterial tablets and wash again after. If it’s for consumption we would recommend using purification stirlazation tablets and washing after.

  9. Sherry Xie says:

    Among white PET, dark brown clear PET and dark blue clear PET bottle, which one is the most light-block?

    • Raepak Ltd says:

      Hello Sherry, Thank you for your question. I hope this explanation helps.

      The colour a person perceives indicates the wavelength of light being reflected. White light contains all the wavelengths of the visible spectrum, so when the colour white is being reflected, that means all wavelengths are being reflected and none of them absorbed, making white the most reflective colour.

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