Chloe Zhang
Acid-free paper is produced in a way that prevents or reduces the likelihood of acidic byproducts forming. In the 1930s, it was discovered that acidic papers deteriorate quickly and are not suitable for archival purposes. The term acid-free is often used to describe products in the photo industry, but it does not apply to plastics. Plastic products labelled as acid-free are simply a marketing tactic, as plastics are inherently acid-free. When choosing plastic enclosures for archival purposes, look for inert and stable materials such as polyester (Mylar), polypropylene, and polyethylene.
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What You'll Learn
There is no such thing as acid-free plastic
It is a common misconception that some plastics are acid-free. While it is true that certain plastics are marketed and labeled as "acid-free," it is important to understand that all plastics can potentially contain acidic compounds or come into contact with acidic substances during their production, use, or disposal. The term "acid-free" is often used in the context of archival or storage materials, suggesting that these plastics will not contribute to the degradation or corrosion of the items they contain. However, the reality is that the presence of acid, even in trace amounts, is unavoidable in the majority of plastic materials. Polyethylene and polypropylene, for example, which are commonly used in archival and food storage applications, are often referred to as acid-free. While these plastics may not have acid added as a component, they can still contain low levels of acidic impurities introduced during manufacturing processes or break down and oxidize over time, releasing small amounts of acid.
Additionally, external factors can affect the acidity of plastics. For example, exposure to sunlight, heat, or certain chemicals can cause plastics to degrade and become more acidic. Contamination can also occur during the recycling process, where plastics intended to be acid-free may come into contact with acidic materials, compromising their neutrality. It is also worth noting that the definition of "acid-free" can vary across industries and applications. In the context of archival storage, for example, "acid-free" may refer to materials with a pH level of 7 (neutral) or slightly higher, allowing for a small buffer against acidity. However, even with these standards in place, it is challenging to guarantee complete acid-free properties due to the variable nature of plastic production and the potential for environmental influences.
Furthermore, the notion of acid-free plastic can give a false sense of permanence and stability. Plastics are not inert materials, and they can still off-gas, leech, or degrade over time, depending on their composition and the presence of other chemicals or environmental factors. It is essential to understand that the use of "acid-free" plastics does not guarantee preservation or the absence of chemical interactions with the items they contain or come into contact with. Proper testing, storage conditions, and handling practices are still necessary to ensure the longevity of stored items and prevent damage from other potential sources of degradation.
Rather than relying solely on the notion of acid-free plastic, it is more accurate to focus on selecting the most suitable plastic for a specific application, taking into account factors such as chemical compatibility, stability, and the potential for long-term interactions between the plastic and its contents. Additionally, the use of buffering agents, inert gases, and proper sealing and storage conditions can provide further protection for sensitive items. In summary, while the term "acid-free plastic" may be used to describe plastics with low acidity or neutral pH levels, it is important to recognize that true acid-free plastics do not exist. Understanding the limitations and potential risks associated with plastics helps make informed decisions about their use and ensures that appropriate measures are taken to protect valuable or sensitive items from degradation or damage.
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The term 'acid-free' originated from paper production
The term "acid-free" is commonly associated with archival-quality materials, particularly in the context of art, preservation, and storage. This term originally emerged from the paper production industry and has since become a standard requirement for high-quality, long-lasting materials.
When paper is produced, one of the key concerns is its longevity and the potential for deterioration over time. Acidic paper is produced when manufacturing processes leave acidic compounds in the paper, typically due to the use of cheap sulphite pulps or from improper manufacturing techniques. These acids can cause the paper to become brittle and discoloured over time, leading to the eventual breakdown of the paper fibre. This process is often referred to as "acid decay" or "acid migration." To combat this issue, the concept of acid-free paper was introduced, ensuring that the paper is manufactured or treated to be pH neutral or alkaline, typically with a pH of 7 or slightly higher.
The term "acid-free" specifically refers to the pH level of the material. Acids can be introduced during the manufacturing process or can form as byproducts of chemical reactions within the material over time. These acids can then migrate and cause damage to the material itself or to other items in close proximity. By using acid-free materials, the risk of acid migration and subsequent damage is significantly reduced, ensuring the long-term preservation of documents, artwork, photographs, and other valuable items.
In the context of plastic production, the term acid-free carries a similar significance. Acid-free plastic is designed to be chemically inert and stable, preventing the formation of acids that could degrade the material or transfer to and damage any items in contact with the plastic. This is particularly important for the storage and protection of valuable or sensitive items, such as rare books, photographs, or artwork. By using acid-free plastic sleeves, enclosures, or storage containers, the risk of acid migration and subsequent damage is minimised, ensuring the preservation of the enclosed items for the long term. This is especially crucial in archives, museums, and galleries, where the preservation of cultural heritage is of utmost importance.
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Acid-free is a marketing tactic for plastic products
The term "acid-free" is commonly used in the photo industry to describe products such as photo albums, paper, plastics, and adhesives. However, it is important to note that the term "acid-free" is not actually used in relation to plastics. Instead, the terms "inert" and "stable" are used to describe plastics that can be safely used for preservation. This is because the concept of being "acid-free" refers to the process of paper production, where different additives are used to prevent or reduce the formation of acidic byproducts, which can cause paper to deteriorate rapidly.
The misconception that plastic products need to be labelled as "acid-free" stems from consumer belief. Consumers began to believe that all their supplies, including plastic ones, needed to be labelled as acid-free, and companies responded to this belief by including the term on their packaging. From the company's perspective, if consumers won't buy a product that isn't labelled "acid-free," it makes sense to include the term on the packaging, even if it is irrelevant to the product. Calling plastic "acid-free" isn't technically a lie, it's just not relevant, as plastic couldn't have been acidic in the first place.
The term "acid-free" gained popularity in the 1990s due to the discovery of old collections of sports cards that had been damaged by the materials used to store them. The cards had yellowed, hardened, and deteriorated, and the term "acid-free" became a buzzword for suppliers marketing better-quality storage materials to collectors. This marketing tactic was successful, and even today, almost every card storage manufacturer still uses the term, as collectors remain wary of products that don't state they are "acid-free."
It is important for consumers to understand that the term "acid-free" does not apply to plastics and that there are other factors to consider when choosing safe plastics for collections. For example, polyvinyl chloride (PVC), a type of plastic commonly used for photo storage, can contain plasticizers that are dangerous and damaging to archival materials. These plasticizers can cause the material to break down and can also release chemical gases that can damage photos. Instead of focusing on the "acid-free" label, consumers should look for plastics made from inert materials such as polyester (Mylar), polypropylene, and polyethylene.
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Acid-free plastic is irrelevant, not a lie
The term "acid-free" is not used in relation to plastics. The terms "inert" and "stable" are used to describe plastics that can be safely used in preservation. The term "acid-free" came into popularity in the 1990s by the sports card hobbyists who discovered that the material used to store old cards had yellowed, hardened, and damaged these relics. So, the term "acid-free" became a buzzword for suppliers when marketing their better-quality storage materials to collectors.
The misconception that plastic needs to be acid-free stems from the fact that paper can be acidic. In the 1930s, it was discovered that acidic papers deteriorate rapidly and are not suitable for archival purposes. Paper production then changed to use different additives to try and prevent the chemical reactions that were causing the paper to break down quickly. This is what the term "acid-free" refers to—paper that has been produced in a way that prevents or reduces the likelihood of acidic byproducts forming.
When it comes to plastic, the terms "inert" and "stable" are used instead of "acid-free". Inert plastics will not break down over time, making them ideal for long-term preservation. Polyvinyl chloride (PVC), on the other hand, is a type of plastic that is often used for photo storage but can be damaging to archival materials due to the addition of plasticizers.
Therefore, the claim that plastic is "acid-free" is not a lie, but rather a marketing strategy aimed at consumers who believe that all their supplies need to be labelled as acid-free. Calling plastic "acid-free" is irrelevant because plastic is not inherently acidic in the first place.
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Acid-free plastic alternatives
While there is no such thing as acid-free plastic, there are several alternatives to plastic materials in general. The environmental impact of plastic waste has led to a growing awareness among consumers and businesses, who are now actively seeking sustainable alternatives.
One alternative is to use materials that are biodegradable. PLA, or bioplastics, for example, is made from corn or sugarcane and is naturally BPA and phthalate-free, making it less toxic and more suitable for food safety. It is also biodegradable under certain conditions. However, there are concerns about the suitability of bioplastics for large-scale use. Another biodegradable alternative is PHA, a bioplastic made from the fermentation of canola oil. It is both home and industrially compostable and has been used to create straws, cups, and clamshell containers.
Another approach is to use materials that are durable and long-lasting, such as stainless steel. Stainless steel products are zero-waste, hygienic, and safe alternatives to everyday plastic household items, such as straws, utensils, and cooking equipment. They are robust and can last a lifetime. Similarly, glass containers can be reused indefinitely and are perfect for storing food, beverages, and cosmetics.
Natural materials, such as bamboo and hemp, are also stepping up as viable alternatives to plastic. Bamboo is a durable and sustainable option for straws, serving bowls, bathroom accessories, and furniture. Hemp is another highly sustainable and renewable natural material with cheap production costs and the ability to thrive in challenging conditions.
Other alternatives include silicone, which is used for baking mats, cups, ice trays, and spatulas due to its flexibility and heat resistance, and wood, which can be used for decorative items, toys, and kitchen accessories.
It is important to note that while these alternatives offer promising solutions, the shift away from plastics is not just about finding substitutes. It is also about rethinking our approach to consumption and waste, embracing circular economies, and prioritizing zero-waste methodologies.
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Frequently asked questions
Acid-free plastic is a marketing term used to describe plastic that does not contain acid. However, the concept of acid-free plastic is misleading, as plastic is inherently acid-free. The term "acid-free" is typically used to describe paper products that have been produced to prevent or reduce the formation of acidic byproducts, which can cause deterioration over time.
Companies label their plastic products as acid-free to meet consumer expectations and beliefs. At some point, consumers began to associate the term "acid-free" with all types of products, including plastic, and became reluctant to purchase items without this label. As a result, companies adapted their packaging to include the term to appeal to a wider audience.
All plastics are inherently acid-free. However, it's important to distinguish between different types of plastics and their suitability for specific purposes. For example, polyvinyl chloride (PVC) is a lower-quality plastic that can deteriorate quickly due to the presence of plasticizers, potentially damaging the items stored within.
For archival storage, it is recommended to use inert and stable plastics that will not react with the stored items. Some examples of suitable plastics include polyester (Mylar), polypropylene, and polyethylene. These plastics are chemically stable and less likely to emit gases or deteriorate, providing safer long-term storage for photographs, documents, and collectibles.
