Maya Ellison
Choosing the right lubricant for plastic parts is crucial to ensure compatibility and avoid damage. Lubricants can prolong the lifespan of plastic parts, reduce friction and wear, and enhance performance. However, using the wrong lubricant can lead to compatibility issues, causing plastic parts to swell, crack, or discolour. Petroleum-based lubricants, in particular, have been known to damage certain plastics and rubbers. Therefore, it is essential to carefully select lubricants that are compatible with the specific plastic material in question. This guide will explore the different types of lubricants, their compatibility with plastics, and provide recommendations to help you make an informed choice to avoid potential damage.
| Characteristics | Values |
|---|---|
| Compatibility with plastics | Silicone, perfluorinated PFAE, mineral oils, synthetic hydrocarbons (SHC or PAO) are compatible with plastics. Esters and polyglycols are generally incompatible with plastic. |
| Effect on plastic parts | Some lubricants can cause plastics to swell, crack, change colour, or discolour over time. |
| Testing for compatibility | Compatibility testing involves observing changes in the physical properties of plastic materials under conditions such as environment, speed, and load. Changes in hardness, strength, elongation, weight, and volume are monitored. |
| Recommendations | It is recommended to use lubricants that are compatible with the specific plastic material to avoid damage. Silicone-based lubricants are a good choice for a wide temperature range. Synthetic lubricants are recommended for long-term applications due to their high aging resistance. |
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What You'll Learn
- Petroleum jelly is compatible with plastics but can degrade some types over time
- Plastic compatibility charts can be used to check if lubricants are safe to use
- Compatibility testing can be carried out to ensure lubricants do not damage plastics
- Some lubricants can cause discolouration, swelling, and cracking of plastics
- Petroleum-based lubricants can damage plastics and rubbers
Petroleum jelly is compatible with plastics but can degrade some types over time
When it comes to lubricants and plastics, compatibility is key. Using the wrong lubricant can cause plastic parts to swell, crack, or discolour, leading to equipment breakdown. This is because lubricants can penetrate and weaken plastic over time. The compatibility of a lubricant with plastic depends largely on its chemical structure.
Some lubricants, like those based on silicone, perfluorinated PFAE, synthetic hydrocarbons (SHC or PAO), and mineral oils, typically work well with plastics. PAOs, for instance, are compatible with most plastics and offer long-term lubrication within a wide temperature range. Silicone-based lubricants are also compatible with plastics and are suitable for low-load applications and a wide temperature range.
On the other hand, esters and polyglycols are generally not compatible with plastics, although there may be exceptions depending on the specific type of plastic material. Solid additives like graphite and molybdenum disulfide can also be problematic, as they can penetrate and weaken plastic parts.
Petroleum jelly, or Vaseline, is generally compatible with plastics but may not give ideal results. While it won't damage synthetic rubber, it can degrade natural rubber and some types of plastics over time. It's important to note that petroleum-based lubricants in spray cans can aggressively damage plastics due to the presence of solvents in the propellants. Therefore, it is always recommended to test the compatibility of a lubricant with a specific plastic before widespread application.
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Plastic compatibility charts can be used to check if lubricants are safe to use
When it comes to lubricants and plastics, compatibility is key. Using the wrong lubricant can cause plastic parts to swell, crack, or discolour, leading to equipment breakdown. To ensure safe and effective lubrication, it is crucial to refer to plastic compatibility charts and undertake compatibility testing.
Plastic compatibility charts are valuable resources that provide insights into the suitability of various lubricants for specific plastics. These charts help users determine which lubricants are safe to use with different plastic types, guiding them towards compatible combinations and away from potentially damaging choices. The charts offer a preliminary assessment of compatibility, serving as a starting point for further evaluation.
The compatibility of a lubricant with plastic is primarily determined by its chemical structure. Certain lubricants, such as synthetic hydrocarbons (including PAO), mineral oils, silicone, and perfluorinated PFAE, are generally compatible with plastics. On the other hand, esters, polyglycols, and glycols are typically not recommended for use with plastics due to potential compatibility issues.
While compatibility charts offer valuable guidance, they may not cover all possible scenarios. It is essential to recognize that plastic and elastomer types vary extensively, and a one-size-fits-all approach may not always apply. Therefore, undertaking compatibility testing is strongly advised to ensure the safety and effectiveness of the chosen lubricant.
Compatibility testing involves subjecting plastic samples to high temperatures and stressful conditions while immersed in the lubricant in question. This process simulates accelerated ageing and helps identify any changes in the physical properties of the plastic, such as weight, volume, hardness, strength, and elongation. By performing this test, users can verify the compatibility of the lubricant with the specific plastic material under consideration.
In conclusion, plastic compatibility charts serve as a valuable initial reference for selecting safe lubricants for plastics. However, to ensure optimal safety and performance, it is recommended to complement the information from these charts with rigorous compatibility testing. By adopting this two-pronged approach, users can make well-informed decisions and mitigate the risk of lubricant-induced damage to plastic components.
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Compatibility testing can be carried out to ensure lubricants do not damage plastics
There are no strict rules for compatibility testing, and the test format can vary depending on the type of plastic and lubricant being used. However, a typical test involves exposing the plastic to the lubricant at elevated temperatures in a laboratory oven. This process simulates accelerated ageing, and the duration of the test can be agreed upon with the customer, usually up to a maximum of 168 hours.
Before the test, all samples are photographed, weighed, and measured. During the test, the control items (not exposed to the lubricant) and test items (fully immersed in the lubricant) are placed in a lab oven at a high temperature. After the test, the items are photographed, weighed, and measured again to check for any changes in dimensions or weight.
It is important to note that there is usually a small amount of change in weight and dimensions when parts are exposed to heat and/or lubricants. This marginal change is considered normal and is not necessarily indicative of a serious compatibility issue. However, the customer must decide if any change will impact the performance of the prototype part or device.
Some lubricants that are generally compatible with plastics include those based on silicone, perfluorinated PFAE, mineral oils, and synthetic hydrocarbons (SHC or PAO). Esters and polyglycols typically do not work well with plastics, but there may be exceptions depending on the specific plastic material.
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Some lubricants can cause discolouration, swelling, and cracking of plastics
Choosing the right lubricant for plastic parts is important to ensure compatibility and avoid damage. Some lubricants can cause discolouration, swelling, and cracking of plastics, which can lead to equipment breakdown.
The compatibility of a lubricant with plastic is determined by its chemical structure and the type of plastic material. Lubricants based on silicone, perfluorinated PFAE, synthetic hydrocarbons (SHC or PAO), and mineral oils typically work well with plastics. However, esters and polyglycols are generally incompatible with plastic, although there may be exceptions depending on the specific plastic material.
It is recommended to perform compatibility testing to ensure that the chosen lubricant does not cause any adverse effects on the plastic. This can be done through a relatively simple test, where samples are placed in an oven at high temperatures to simulate stressful conditions. Changes in weight, dimensions, and other physical properties are then observed to determine compatibility.
Some lubricants, such as spray cans, can aggressively damage plastics due to the presence of petroleum products and solvents in the propellants. Petroleum-based lubricants may also not be suitable for lubricating petroleum-based components, as they can penetrate and weaken plastic parts.
To prevent discolouration, swelling, and cracking of plastics, it is important to consider the chemical compatibility of the lubricant with the specific plastic material. Manufacturers should closely monitor changes in physical properties such as hardness, strength, elongation, weight, and volume to ensure compatibility and avoid potential issues.
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Petroleum-based lubricants can damage plastics and rubbers
While lubricating plastic components can make them faster, smoother, and more damage-resistant, it is important to choose the right lubricant to avoid damage. Petroleum-based lubricants can damage plastics and rubbers.
Some lubricants can cause plastics and rubbers to swell, crack, or change colour. This damage is not instant and can take a long time to occur. The additives included in the lubricant formula could be the cause of this damage, not just the base oil. Therefore, it is important to be cautious when selecting a lubricant to use on plastics and rubbers.
Petroleum jelly, for example, is compatible with plastics and synthetic rubber but can degrade natural rubber and some types of plastics. Similarly, while silicone-based lubricants are generally compatible with plastics, certain mixes contain additives that could hinder performance or damage internal components.
To ensure compatibility, it is recommended that customers undertake a compatibility test for the specific plastic, rubber, and lubricant in question. These tests are typically carried out at high temperatures to simulate accelerated use and stressful conditions. Changes in weight, volume, hardness, strength, and elongation are monitored to determine compatibility.
Additionally, it is important to consider the specific type of plastic when choosing a lubricant. Lubricants based on silicone, perfluorinated PFAE, synthetic hydrocarbons (SHC or PAO), and mineral oils typically work well with plastics, while esters and polyglycols are generally incompatible.
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Frequently asked questions
Yes, petroleum-based lubricants can damage plastics and elastomers, causing them to swell, crack, or discolour over time.
Some alternatives that are safe for plastics include lubricants based on silicone, perfluorinated PFAE, synthetic hydrocarbons (SHC or PAO), and mineral oils.
To test if a lubricant is compatible with plastic, you can perform a compatibility test by immersing a sample of the plastic in the lubricant and observing any changes in physical properties such as weight, volume, hardness, strength, and elongation.
