Ethan Clarke
Choosing the right lubricant for plastic is crucial to avoid permanent damage or destruction. While some lubricants can be used on plastic, such as silicone grease, others like spray cans and petroleum-based products can aggressively damage plastics. The best lubricants for plastic are those that are compatible with the specific type of plastic and its intended use, offering excellent performance, value, and aging resistance. Synthetic lubricants, like hydrocarbon (PAO) types, are often preferred for their compatibility with most plastics and ability to provide long-term lubrication at a wide temperature range. Other options include silicone-based lubricants, PFAE oils, and mineral oils, which work well with plastics but may depend on the type of plastic and its environment.
| Characteristics | Values |
|---|---|
| Lubricant Type | Silicone grease, PTFE, Krytox, mineral oil, synthetic lubricants, PFAE, SHC, PAO, lithium grease, petroleum jelly, graphite powder/paste, beeswax, hexagonal boron nitride, titanium disulfide, powdered PTFE |
| Application | Low load applications, plastic gears and bearings, plastic safe |
| Temperature Range | -90 to 425°F (silicone-based), -60 to 320°F (PAO), up to 500°F (PFAE) |
| Compatibility | Must be compatible with specific plastic, verified under anticipated loads, speeds, and environments; mineral oil-based lubricants are generally compatible with most plastics |
| Aging Resistance | Synthetic lubricants have high aging resistance, preferred for higher operating speeds, temperatures, and longer operations |
| Additives | Avoid additives, viscosity ratings, or purposed mixes that can hinder performance or damage internals |
| Consistency | A light coat is usually sufficient for plastics |
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What You'll Learn
Silicone-based lubricants are safe for plastics
When it comes to lubricants for plastics, it is important to choose the right product to avoid permanent damage or even the destruction of the plastic item. The wrong lubricant can have destructive effects on plastic components, causing irreparable damage.
Silicone-based lubricants, however, are safe for use on plastics. Silicone grease, in particular, is a good option as it is inert towards plastics and elastomers, meaning it does not produce structural variations. This makes it a versatile product, suitable for use on plastics as well as mixed couplings such as rubber-plastic or metal-plastic. It is also used in the automotive industry, demonstrating its effectiveness and versatility.
Silicone-based lubricants have a low coefficient of friction due to the wide bond angles between silicone and oxygen in the siloxane polymer. This property is advantageous when dealing with elastomeric surfaces, such as rubber seals or sealing rings sliding on plastics. The slippery nature of silicone grease reduces friction and helps improve the performance and lifespan of plastic components.
There are various silicone-based lubricants available on the market, such as Jet-Lube Food Grade Silicone, which is safe for use on plastics and is moisture-resistant. This product has received positive reviews for its quality and effectiveness, leaving no excessive residue and not causing stains or streaks. Another option is to use silicone oil, which can be found in products like Superlube, suitable for lead screws and other moving parts.
It is important to note that while silicone-based lubricants are generally safe for plastics, it is always advisable to choose the appropriate lubricant for your specific application. Different plastics may have varying levels of chemical fragility, so understanding the interactions between the plastic and lubricant is crucial to avoid any potential damage.
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Avoid spray cans, they can damage plastics
When looking for a good lubricant for plastic, it is important to avoid spray cans of any kind. Spray cans often contain petroleum products, solvents, and propellants that can aggressively damage plastics. Some may even contain alcohol as a thinner. These products can cause permanent damage and even lead to the eventual destruction of plastic items.
The propellants used in spray cans, such as hydrocarbons and compressed gases like nitrous oxide, can be hazardous. These compounds can react with the metal in the can, leading to the production of volatile organic compounds (VOCs). VOCs are harmful to the environment as they contribute to the formation of ground-level ozone, which, in turn, increases the creation of ozone molecules. This can lead to reduced visibility due to smog and have negative effects on human health, particularly for sensitive groups such as babies and the elderly.
Additionally, the high pressure inside aerosol cans poses safety risks. If punctured or depressurized incorrectly, these cans can explode, causing injuries and even deaths. The disposal of aerosol cans is also a concern, as they are often considered hazardous waste and must be properly depressurized and cleaned before recycling.
To avoid these issues, it is recommended to use alternative lubricants for plastic items. Some options include silicone grease, lithium grease, and petroleum jelly. These products can be safely applied without the use of spray cans and are less likely to damage plastics when used appropriately.
It is important to note that not all lubricants are suitable for plastics, and some may even be detrimental. For example, WD-40 was not developed as a lubricant and should not be used on plastic items. Always research and select lubricants that are specifically intended for use with plastics to avoid any potential damage.
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Mineral oil-based lubricants are good for plastic
Mineral oil-based lubricants are good candidates for lubricating plastics because they don't attack most plastic materials and offer excellent performance for the price in general plastic applications. They are also known as hydrocarbon (PAO) types and are compatible with most plastics. PAO's high ageing resistance is one of its most sought-after characteristics, allowing it to provide long-term lubrication at temperatures ranging from −60 to 320°F.
However, as machines move to higher operating speeds, temperatures, and longer operations, companies prefer synthetic lubricants like PAO for plastic bearings and gears. This is because outgassing byproducts of plastic, such as formaldehyde and styrene, accelerate ageing in lubricants, and as lubricants age, they are more likely to degrade plastics.
Mineral oil-based lubricants are safe to use with plastics and rubbers, unlike some other lubricants that can damage or destroy plastics over time. For example, Krytox, a popular lubricant, is not recommended for use with plastic unless you already have it, as it is not oxygen safe. Similarly, Molycote 55 should not be used with ABS or polycarbonate.
Silicone-based lubricants, such as PFAE, are also compatible with plastics and are well-suited for low load applications. They can withstand temperatures from −90 to 425°F. However, it is important to note that silicone spray is not recommended as the volatile aerosol carriers are often not plastic safe.
When choosing a lubricant for plastic parts, it is crucial to ensure compatibility with the specific plastic. This compatibility must be verified under all anticipated loads, speeds, and environments to avoid issues such as stress cracking and failure of the part.
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Synthetic lubricants are best for long-term use
When it comes to choosing a lubricant for plastic, it is essential to consider the long-term effects on the plastic material. While various lubricants can be used with plastic, synthetic lubricants stand out as the best option for prolonged use.
Synthetic lubricants, such as PAO hydrocarbon, offer excellent aging resistance, making them ideal for long-term applications. They are designed to resist the negative effects of outgassing byproducts of plastic, specifically formaldehyde and styrene, which can accelerate the aging process of lubricants and lead to potential damage to the plastic. By minimizing the impact of these byproducts, synthetic lubricants maintain their integrity and effectiveness over extended periods.
Another advantage of synthetic lubricants is their compatibility with most plastics. PAO, for example, is compatible with a wide range of plastics and provides long-term lubrication. On the other hand, lubricants like esters and polyglycols are generally incompatible with plastics and should be avoided for long-term use. The compatibility of a lubricant with plastic is crucial, as using the wrong lubricant can result in permanent damage or even destruction of the plastic item.
Synthetic lubricants also offer a range of performance benefits. They can reduce friction, improve heat resistance, and enhance the ability of the plastic to withstand higher temperatures. This makes them particularly useful in automotive and electronic applications, where smooth, noise-free operations and heat management are essential. For example, in automobiles, plastic lubricants extend the life of components like gears and bearings, improving the driving experience and reducing issues like 'stick-slip'.
Additionally, synthetic lubricants can provide anti-static properties, which are crucial for sensitive electronic devices. In healthcare applications, synthetic lubricants are also indispensable for devices like auto-injectors and surgical robotic arms, where precision and biocompatibility are paramount.
In summary, synthetic lubricants are the best choice for long-term use with plastics due to their aging resistance, compatibility, and performance benefits. They help maintain the integrity of plastic items, ensure smooth operations, and provide essential advantages in various industries, from automotive to healthcare. By choosing synthetic lubricants, users can maximize the lifespan and functionality of their plastic components.
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Petroleum jelly is compatible with plastics
When it comes to lubricants for plastic, there are a variety of options available, each with its own advantages and considerations. One option that is often discussed is petroleum jelly.
Petroleum jelly, also known as petrolatum, soft paraffin, or multi-hydrocarbon, is a semi-solid mixture of hydrocarbons. It has a wide range of applications and is commonly used as a topical ointment for its healing properties and skin protection. Native Americans first discovered the benefits of petroleum jelly for skin protection and healing. Over time, it has also found use in cosmetic skincare and various industrial applications.
Regarding its compatibility with plastics, opinions vary. Some sources suggest that petroleum jelly can be used as a lubricant for plastic and is compatible with synthetic rubber and a wide range of materials and chemicals. For example, it can be used to lubricate the joints of plastic recorders without causing any apparent interaction or issues. Additionally, it can be used to fill copper or fibre-optic cables with plastic insulation to prevent water ingress.
However, other sources suggest that petroleum jelly may not be the best choice for lubricating certain types of plastic. Some claim that it can dissolve plastics, particularly polypropylene (PP), over time. This is because petroleum jelly acts as a plasticizer, softening the plastic. It is important to note that not all plastics are the same, and some may be unaffected by petroleum jelly, such as acrylates.
To ensure compatibility and avoid potential issues, it is recommended to test on a small area first or choose alternative lubricants like silicone-based options, which are generally considered safe for use with plastics. Silicone oils like dimethicone (PDMS) and cyclomethicone are commonly used and are effective plasticizers in polymer systems.
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Frequently asked questions
Good lubricants for plastic include silicone grease, Krytox, Crisco, bar soap, Fluid Film, beeswax, and pipe dope.
Avoid using spray cans of any kind, including silicone spray, as the volatile aerosol carriers are often not plastic safe. Other lubricants to avoid include graphite powder, which is messy and does not stay put, and Molybdenum disulphide, which is best used on steel parts.
It is important to choose a lubricant that is compatible with the specific type of plastic. The lubricant's chemistry, viscosity, and resistance to aging should be considered. Additionally, the lubricant should be tested under all anticipated loads, speeds, and environments to ensure compatibility and avoid potential damage to the plastic.
