Ethan Clarke
The Plastics Identification Code, commonly known as the 'recycle symbol', is a way to identify the specific type of plastic used in an item. The number within the triangle, ranging from 1 to 7, represents the type of plastic. While the code does not indicate whether an item can be recycled, it is generally safe to recycle plastics with codes 1, 2, and 5. Plastic #7 is used in various products, including sunglasses, computer cases, and water bottles. In terms of resin, it can be waterproof once fully cured, forming a barrier against liquids and solids. However, it is important to note that not all resins are equal, and some, like water-washable resins, are promoted as more environmentally friendly.
| Characteristics | Values |
|---|---|
| Recycling symbol | 7 |
| Items made from | Sunglasses, iPod cases, computer cases, nylon, 3-5 gallon water bottles, bullet-proof materials |
| Recycled into | Plastic lumber and other custom-made products |
| Safety | May contain harmful chemicals such as bisphenol compounds which can lead to chromosomal errors, decreased sperm quality, early puberty, disrupted reproductive cycles, and other health problems |
| Eco-friendliness | Not eco-friendly, but can be recycled into new products |
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What You'll Learn
- Resin plastic 7 is used in items like iPod cases and 5-gallon water bottles
- Plastic #7 contains bisphenol compounds, which can be harmful to foetuses and adults
- Recycle codes 1, 2 and 5 are generally considered safe for recycling
- Resin becomes waterproof after it has fully cured
- Water-washable resins are not eco-friendly, but they are cost-saving and easy to clean
Resin plastic 7 is used in items like iPod cases and 5-gallon water bottles
The number within the triangle on plastic items, commonly known as the 'recycle symbol', is a Plastics Identification Code (or Resin Identification Code). The code ranges from 1 to 7 and helps identify the type of plastic an item is made from. While the code does not indicate whether an item can be recycled, codes 1, 2, and 5 are generally accepted by most recycling programs.
Plastics with the number 7 code are a mixed bag and include polycarbonate, which contains the toxic bisphenol-A (BPA). These plastics are associated with health risks due to the presence of hormone disruptors like BPA, which has been linked to infertility, hyperactivity, and reproductive issues. Plastic #7 is found in various products, including iPod cases, computer cases, nylon, 3- and 5-gallon water bottles, sunglasses, and bullet-proof materials.
It is important to note that even if a product is labelled as "BPA Free", it should not be used in high-temperature situations as higher temperatures will cause greater toxin release. Plastic #7 is recycled into plastic lumber and other custom-made products.
Other types of plastics and their common uses include:
- Plastic #1 (PET): Clear plastic used for soda and water bottles, vegetable oil containers, and other transparent packaging.
- Plastic #2 (HDPE): Milk, detergent bottles, food containers, shampoo and conditioner bottles, butter and yogurt containers, and some shopping bags.
- Plastic #3: Toys, pipes, cable insulation, medical equipment, furniture, vinyl products, and food packaging.
- Plastic #4 (LDPE): Lightweight and flexible plastic used in plastic bags, food packaging, and bubble wrap.
- Plastic #5: Yogurt containers, ketchup bottles, syrup bottles, medicine bottles, and microwave meal boxes.
- Plastic #6 (Polystyrene): Disposable cups, bowls, takeout food packaging, packing peanuts, bike helmets, disposable cutlery, razors, compact discs, and DVD cases.
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Plastic #7 contains bisphenol compounds, which can be harmful to foetuses and adults
Plastic #7, also known as polycarbonate, is often marked with the number "7 PC" and is commonly found in baby bottles and other plastic food packaging. It is not recyclable and contains Bisphenol A (BPA), a chemical compound primarily used in the manufacturing of various plastics. While not all #7 plastics contain BPA, it is important to exercise caution when using these products, especially for items like baby bottles.
BPA is a colourless solid that is soluble in most common organic solvents but has poor solubility in water. It is produced on an industrial scale by the condensation reaction of phenol and acetone, with global production estimated at 10 million tonnes in 2022. While normal exposure to BPA is typically below the risk level, it is a pervasive material, and exposure can occur through food, dust, thermal paper, clothing, dental materials, and medical devices.
The health effects of BPA have been the subject of extensive scientific discourse, with over 19,000 scientific journal papers published on the topic as of 2025. Although BPA exposure is common, it does not accumulate in the body, with a biological half-life of around two to five hours in adult humans. The body eliminates BPA through glucuronidation or sulfation, which increases its water solubility, allowing for easy detection through urine testing.
Due to concerns about the health effects of BPA, some manufacturers have replaced it with other bisphenols, such as bisphenol S and bisphenol F. However, there are also health concerns surrounding these substitutes. Alternative polymers, like tritan copolyester, have been developed to provide the same properties as polycarbonate without using BPA or its analogues. While some sources advise avoiding most plastics, including #7, it is important to note that not all #7 plastics are toxic, and some, like ABS, AS, and SAN plastics, are considered safe for use.
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Recycle codes 1, 2 and 5 are generally considered safe for recycling
The presence of a resin code doesn't necessarily indicate that an item is recyclable. The numbers within the triangle, commonly known as the 'recycle symbol', are a Plastics Identification Code (or Resin Identification Code). These codes help recycling facilities identify and separate plastics for new purposes. While not everything with these codes can be put into your recycling bin, it is generally safe to recycle anything with recycling codes 1, 2, and 5. These items are accepted by most councils.
Code 1 is assigned to plastic containers commonly used for beverages, such as water bottles, soft drinks, and vegetable oil containers. PET is highly recyclable and can be transformed into various products. Code 1 plastic is the most common and easiest to recycle due to its lightweight and transparent properties.
Code 2 is typically found on milk, detergent bottles, food containers, shampoo and conditioner bottles, butter and yoghurt containers, and some reusable shopping bags. This type of plastic is also easily recyclable and can be made into new containers or plastic lumber. However, only rigid and hard code 2 plastics can go kerbside; soft plastics must be recycled separately.
Code 5 plastics are generally safe to recycle, but the specific rules may vary depending on your local council's guidelines. It is always best to check your local council's website for the most accurate information.
It is important to note that the recyclability of plastics also depends on the capabilities of the facilities in your community. Some plastics, such as Styrofoam, shrink wrap, and manufacturing scrap, require specialized handling and may not be accepted by all recycling companies. Additionally, certain types of plastic, like grocery bags, should not be put into recycling bins as they can get tangled in the equipment at recycling facilities.
Overall, understanding the 1-7 recycling codes can help you make informed choices, reduce 'wish cycling', and contribute to a greener future.
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Resin becomes waterproof after it has fully cured
Resin is a versatile material with many applications, including waterproofing. The waterproofing properties of different types of resin vary, and some resins are more effective and durable than others. However, one common feature is that resin generally becomes waterproof after it has fully cured.
The curing time for resin varies depending on the type of resin used. For example, Polyurethane Resin can cure in as little as a few minutes, while other resins may take up to 24-72 hours. Art resin typically cures faster than resin paint, and UV resin can cure quickly under UV light exposure.
It is crucial to ensure that the resin does not come into contact with water until it has finished curing. If the resin is exposed to moisture during the curing process, it can lead to several issues. Firstly, it can cause a cloudy, milky, or hazy appearance in the cured resin. Secondly, moisture can cause surface imperfections such as ripples, waves, divots, and a pockmarked surface. Thirdly, moisture can hinder the chemical reaction between the resin and hardener, resulting in incomplete or slow curing and a tacky or soft surface. Finally, moisture can weaken the bond between the resin and the substrate, potentially leading to delamination.
Therefore, it is essential to take precautions to prevent water from contaminating the resin mixture. This includes ensuring that all tools, mixing cups, and molds are dry and leaving caps on bottles when using a water bath. Additionally, natural objects such as flowers and leaves that may contain moisture should be thoroughly dried before embedding them in resin.
Once the resin has fully cured, it forms a strong and durable bond, creating a barrier that blocks the permeation of liquids and solids, including water and humid air. This impermeable property makes resin an effective solution for protecting surfaces from potential damage caused by moisture. Resin is commonly used as a sealant to waterproof various materials, including wood, metal, concrete, glass, and even some plastics.
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Water-washable resins are not eco-friendly, but they are cost-saving and easy to clean
Water-washable resins are not inherently eco-friendly. In fact, they are considered toxic to the environment if not handled properly. The liquid form of water-washable resin can cause mild allergic reactions when exposed to the skin. Therefore, it is crucial to handle it with caution and avoid direct skin contact.
However, water-washable resins offer advantages in terms of cost savings and ease of cleaning. Unlike traditional resins, water-washable resins do not require additional cleaning solutions, such as isopropyl alcohol, for post-processing. This simplifies the cleanup process and results in cost savings over time, despite the slightly higher initial price of water-washable resins.
The cleaning process for water-washable resins is straightforward and convenient. Users can rinse the resin with water, either by hand or using a washing machine, to effectively clean their printed models. However, it is important to be cautious during cleaning to avoid accidentally washing away the fine details of the printed model.
While water-washable resins offer benefits in terms of cost and ease of cleaning, it is important to recognise that they are not a "green" or eco-friendly solution. The marketing of these resins as environmentally friendly has been criticised as deceptive or even a scam. The waste water from water-washable resins is not safe to dispose of down the drain and requires responsible handling, similar to traditional resins.
Overall, while water-washable resins provide advantages in terms of cost-effectiveness and ease of cleaning, it is essential to be aware of their limitations regarding eco-friendliness and potential skin irritation. Responsible handling and disposal of water-washable resins are crucial to minimise negative environmental and health impacts.
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Frequently asked questions
The number within the triangle on plastic items, commonly known as the 'recycle symbol', is the Resin Identification Code. It tells you what type of plastic an item is made from.
Plastic #1 is intended for one-time use only. As a precaution, these bottles should not be reused or heated. Plastic #2 is the most commonly recycled plastic and is safe for water.
Plastic #7 is used in sunglasses, iPod cases, computer cases, nylon, 3-5 gallon water bottles, and bullet-proof materials.
Water-washable resin is less odorous, easier to clean up, and more cost-effective than traditional resins.
Yes, once the resin has fully cured, it becomes waterproof, forming a barrier that blocks the permeation of liquids and solids, such as water and humid air.
