Maya Ellison
When it comes to lubricating plastic components, it is essential to consider the compatibility of the lubricant with the plastic material to ensure optimal performance and longevity. Moly lube, short for molybdenum disulfide, is a mineral oil-based grease that has been known to be used on plastic parts. While some sources suggest that moly lube may not be the best choice for plastic components due to concerns about potential negative effects, others have observed its constant contact with certain plastics and rubbers without any noticeable issues. The choice of lubricant depends on various factors, including the type of plastic, the presence of other materials, and the specific application requirements.
| Characteristics | Values |
|---|---|
| Compatibility with plastic | MOLYKOTE® lubricants are compatible with plastic. However, Moly grease may eat plastics. |
| Plastic components | It is a good idea to lubricate plastic components to reduce friction and wear, lower power consumption, and increase part life. |
| Plastic parts | The most important factor when choosing a lubricant for plastic parts is compatibility to avoid weakening or degrading the plastic. |
| Type of lubricant | Mineral-oil-based lubricants, synthetic lubricants, silicone-based lubricants, and PFAE lubricants are compatible with plastic. |
| Temperature range | Synthetic lubricants have a temperature range of -60º to 320ºF, while silicone-based lubricants can operate between -90º to 425ºF, and PFAE lubricants can withstand temperatures up to 500ºF. |
| Cost | Mineral-oil-based lubricants are economical, while PFAE lubricants are expensive. |
| Discoloration and cracking | Some lubricants can cause plastic to discolor, swell, and crack over time, so proper lubricants like MOLYKOTE® should be used to avoid long-term damage. |
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What You'll Learn
- MOLYKOTE® lubricants are tailored for plastic-on-plastic applications and have low bleed values
- Lubricants with silicone, perfluorinated PFAE, mineral oils, and synthetic hydrocarbons usually work well with plastics
- Solid lubricants like graphite and molybdenum disulfide can penetrate and weaken plastic parts
- Mineral-oil-based lubricants are economical and compatible with most plastics, but synthetic lubricants are better for high operating speeds
- White lithium grease is generally safe to use with plastics and rubber and does not eat away at them
MOLYKOTE® lubricants are tailored for plastic-on-plastic applications and have low bleed values
Lubricating plastic components is a good idea as it reduces friction and wear, lowers power consumption, and increases the life of the part. However, the choice of lubricant is critical as some lubricants can damage plastics. For example, solid additives like graphite and molybdenum disulfide can penetrate and weaken plastic parts.
MOLYKOTE® lubricants are specifically designed for plastic-on-plastic applications and are known for their low bleed values. They offer a range of grease formulations that are compatible with plastic-on-plastic applications, where oil spreading or migration is undesirable.
The compatibility of a lubricant with plastic is determined by its chemical structure. Lubricants based on silicone, perfluorinated PFAE, mineral oils, and synthetic hydrocarbons (SHC or PAO) typically work well with plastics. However, esters and polyglycols are generally not compatible with plastics.
When choosing a lubricant for plastic parts, it is essential to consider the specific plastic material and the operating conditions, such as speed, load, and environment. Manufacturers typically allow changes in physical properties within a range of 7% to 10%. It is also important to note that both lubricants and plastic materials are more prone to change in high temperatures and adverse environments.
MOLYKOTE® offers specialty lubricants that are suitable for plastic-on-plastic applications, providing a solution where a wet solution is undesirable with their dry-film lubricants.
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Lubricants with silicone, perfluorinated PFAE, mineral oils, and synthetic hydrocarbons usually work well with plastics
Lubricants are essential for plastic components as they reduce friction and wear, lower power consumption, and increase the life of the plastic parts. The compatibility of a lubricant with plastic depends on its chemical structure.
Lubricants based on silicone, perfluorinated PFAE, mineral oils, and synthetic hydrocarbons (SHC or PAO) are usually compatible with plastics. Silicone-based lubricants are compatible with plastics and are suitable for a wide temperature range, typically -90º to 425ºF. They are a good choice for low-load applications. Perfluorinated PFAE lubricants are also highly compatible with plastics, even with hard-to-match plastics. They can be used in extreme temperature applications, up to 500ºF. However, due to their high cost, they should only be used when necessary.
Mineral-oil-based lubricants are another option that is compatible with most plastics and offer excellent performance at a reasonable cost. However, if your application requires high operating speeds, high temperatures, or long operation, synthetic lubricants like hydrocarbon (PAO) types are recommended. PAO lubricants are compatible with most plastics, have high aging resistance, and offer long-term lubrication within a wide temperature range, typically -60º to 320ºF.
It is important to note that esters and polyglycols are generally not recommended for use with plastics, although there may be exceptions depending on the specific type of plastic material. Additionally, certain additives in lubricants can cause unintended reactions with plastics, leading to undesirable outcomes. Therefore, it is crucial to carefully consider the type of plastic and choose a suitable lubricant to ensure compatibility and avoid any adverse effects.
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Solid lubricants like graphite and molybdenum disulfide can penetrate and weaken plastic parts
Lubricating plastic components is essential to reducing friction and wear, lowering power consumption, and increasing part life. However, not all lubricants are suitable for plastic. The compatibility of a lubricant with plastic depends on its chemical structure. While lubricants based on silicone, perfluorinated PFAE, mineral oils, and synthetic hydrocarbons typically work well with plastics, esters and polyglycols generally do not. Solid lubricants, such as graphite and molybdenum disulfide (MoS2), are effective at high temperatures and in oxidizing atmospheres, where liquid lubricants typically fail. They can operate at temperatures up to 350 °C (662 °F) in oxidizing environments and even higher in non-oxidizing environments. For example, molybdenum disulfide can withstand temperatures up to 1100 °C (2012 °F).
However, solid lubricants like graphite and molybdenum disulfide can have adverse effects on plastic parts. These solid additives can penetrate and weaken plastic, leading to a loss of structural integrity. This is because different plastics have varying resistances to chemical penetration. Therefore, it is crucial to verify the compatibility of a lubricant with the specific plastic material before use. Manufacturers typically allow changes in physical properties, such as weight, volume, hardness, strength, and elongation, within a range of 7% to 10%.
To ensure compatibility, it is essential to test the lubricant under all anticipated loads, speeds, and environmental conditions the plastic part will be exposed to. If the lubricant and plastic are incompatible, it can result in stress cracking and failure of the part. For instance, mineral oil can penetrate and soften natural or synthetic rubber products, including O-rings, causing them to swell and eventually fail. Similarly, silicone lubricants can cause certain types of rubber to swell.
In contrast to graphite and molybdenum disulfide, PTFE solid additives can be beneficial for plastic parts. PTFE provides dry lubrication and reduces startup friction. Additionally, high-viscosity oils are less likely to penetrate and adversely affect plastic materials. By choosing the right lubricant and ensuring its compatibility with plastic, one can avoid undesirable outcomes and maintain the integrity and functionality of plastic parts.
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Mineral-oil-based lubricants are economical and compatible with most plastics, but synthetic lubricants are better for high operating speeds
Lubricating plastic components is essential to reduce friction and wear, lower power consumption, and increase part life. When choosing a lubricant for plastic parts, compatibility is key to ensuring the lubricant does not weaken or degrade the performance properties of the plastic.
Mineral-oil-based lubricants are compatible with most plastics and offer excellent performance at a low cost. However, they may not be suitable for high operating speeds, high temperatures, or long-term operations. This is because mineral oils can cause some materials, such as O-rings and latex gloves, to soften and swell.
Synthetic lubricants, such as hydrocarbon (PAO) types, are a better choice for high operating speeds and temperatures. PAOs are compatible with most plastics, have high aging resistance, and offer long-term lubrication within a wide temperature range. They also have a high resistance to aging, which is beneficial for long-term operations.
Another option is silicone-based lubricants, which are compatible with plastics and offer excellent performance in low-load applications and a wide temperature range. However, they may be more expensive than mineral-oil-based lubricants.
It is worth noting that some lubricants, particularly those containing solid additives like graphite and molybdenum disulfide, can penetrate and weaken plastic parts. Therefore, it is crucial to select a lubricant specifically designed for use with plastics, such as MOLYKOTE®, which offers low-bleed lubricants that excel in plastic-on-plastic and plastic-on-metal applications.
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White lithium grease is generally safe to use with plastics and rubber and does not eat away at them
When it comes to lubricating plastic components, it is important to choose a product that is compatible with the specific type of plastic to avoid negative effects such as discolouration, swelling, or cracking. While some lubricants can weaken or degrade plastic parts, others can extend the life and efficiency of these components.
White lithium grease is generally considered safe to use with plastics and rubber and does not eat away at them. Lithium is used as the base for this grease, and it is often combined with various additives for different applications. Users of white lithium grease have reported positive experiences, with no noticeable negative effects on plastic or rubber parts.
It is worth noting that some lubricants, such as those containing solid additives like graphite and molybdenum disulfide, can penetrate and weaken plastic parts. In contrast, PTFE solid additives can be beneficial by providing dry lubrication and reducing startup friction. Mineral-oil-based lubricants, including "Moly" Grease, are generally not recommended for use with plastics as they can penetrate and damage certain materials, including O-rings and synthetic rubber products.
To ensure compatibility, it is important to verify that the chosen lubricant is suitable for the specific type of plastic. Manufacturers typically monitor changes in physical properties such as weight, volume, hardness, strength, and elongation under different conditions to determine the compatibility of lubricants with specific plastics.
Overall, white lithium grease is a safe choice for lubricating plastic and rubber parts, but it is always advisable to refer to the manufacturer's recommendations and guidelines for specific plastic materials.
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Frequently asked questions
Moly Lube is a mineral oil-based grease.
Moly Lube may weaken or degrade plastic parts. It is not advised to use Moly Lube on plastic.
Good alternatives to Moly Lube for plastic include lubricants based on silicone, perfluorinated PFAE, mineral oils, and synthetic hydrocarbons (SHC or PAO).
Lubricating plastic components reduces friction and wear, lowers power consumption, and increases part life.
When choosing a lubricant for plastic parts, it is important to consider the compatibility between the lubricant and the plastic material. Manufacturers monitor changes in physical properties of the plastic material under conditions of speed, load, and environment to determine compatibility.
