Maya Ellison
Plumbers often face the dilemma of whether to use putty or silicone on plastic sink drains. While some plumbers prefer the traditional putty for its immediate effectiveness and longevity, others opt for clear silicone due to its comparable performance and ease of removal. However, a significant concern arises from the potential reaction between the naphthenic oils in plumber's putty and plastic, which may lead to staining or even the breakdown of the plastic over time. This has prompted the creation of a non-staining putty variant, although it comes at a higher cost. Ultimately, the choice between putty and silicone depends on the specific circumstances and preferences of the plumber.
| Characteristics | Values |
|---|---|
| Reason for not using plumber's putty on plastic | The oil in the putty may react with the plastic, breaking it down |
| The oil in the putty may leach out and stain the plastic | |
| Alternative to plumber's putty on plastic | Silicone |
| Plastic/rubber washer that comes with the drain | |
| Stain-free putty |
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What You'll Learn
Naphthenic oils in plumbers putty can stain plastic
Plumbers putty is a popular sealant used by plumbers and DIY enthusiasts for various sealing applications. It is made from chalk and linseed oil, which is derived from petroleum, and has a clay-like consistency. While it is a great sealant for nonporous materials like metal and ceramic, it should not be used on plastic. This is because the naphthenic oils in the putty can leach out and stain the plastic.
The oily composition of plumber's putty prevents it from properly bonding with smooth plastic surfaces. It will not seal these surfaces effectively and can easily become dislodged, leaving gaps for leaks. The putty simply isn't compatible with plastic components and can cause chemical damage to plastics like PVC, CPVC, and ABS over time. This is because plastics are sensitive to petroleum products, which can negatively react with the material, causing structural degradation, cracking, and product failure.
The naphthenic oils in plumber's putty can also stain porous stone, such as marble. For this reason, it is recommended to use a non-staining version of the putty if you are concerned about staining. Alternatively, plastic drain pipes and fittings should be joined using proper solvent cement or rubber gaskets designed for the specific type of plastic. Following manufacturer recommendations for adhesive products will help prevent leaks or damage and preserve the integrity of plastic materials.
It is important to note that the use of plumber's putty on plastic may not cause immediate damage or staining. However, over time, the putty can degrade the plastic and cause leaks, so it is best to avoid using it on plastic altogether.
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Oils can leach out and stain porous materials
Plumbers often recommend using putty on plastic sink drains because it lasts as long as the sink drain. However, some people advise against using plumber's putty on plastic because the oil in the putty can leach out and stain porous materials, potentially reacting with and breaking down the plastic.
Oils can be difficult to remove from porous materials because they leave behind a greasy patch that is slightly darker than the surrounding material. The longer an oil stain sits, the darker it becomes, and if left for too long, it can set permanently.
To remove oil stains, it is important to act quickly and treat the stain before it dries. Blotting the stain with a tissue or paper towel can help remove excess grease. For grease or cooking oil stains, pretreatment with a spot of dish soap can help loosen the stain before washing. Enzyme-based liquid detergents or common household items like white vinegar and warm water can also be effective in breaking down and lifting oil stains.
When using plumbers' putty, it is important to consider the potential for oil leaching and staining. While it may not be an immediate concern, prolonged exposure could result in discolouration or other issues. It is always recommended to follow the manufacturer's instructions and guidelines when working with any sealing product, including plumbers' putty.
To avoid potential issues with oil leaching and staining, some people opt for alternatives such as clear silicone or stain-free putty when working with plastic. These alternatives may be more expensive and less commonly used, but they can provide a solution for those concerned about the potential drawbacks of using traditional plumbers' putty on plastic surfaces.
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Plumbers putty may not set on plastic
Plumbers typically use putty on plastic sink drains because it lasts as long as the sink drain. However, plumbers putty may not set on plastic due to the potential reaction between the oil in the putty and the plastic. The oils in plumbers putty can leach out and stain plastics or porous stone. This can cause the plastic to break down over time.
Plumbers putty is a mixture of mineral and vegetable oil, limestone, talc, and clay. Naphthenic oils are commonly found in plumbers putty and can affect the plastic. While the putty may not set, some plumbers have used it on plastic drains without issue.
As an alternative, plumbers can use a plastic or rubber washer that comes with the drain. Clear silicone can also be used, although it is more difficult to remove and may not set as quickly as putty. A non-staining version of plumbers putty is available, which may be more suitable for use on plastic.
It is important to follow the manufacturer's instructions and warnings when using plumbers putty or any other sealant. While some plumbers have used putty on plastic drains without issue, it is always best to use the recommended materials and methods to ensure a proper seal and avoid potential damage to the plastic.
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Plastic washers are recommended for plastic drains
Plastic washers, such as the Danco 81086 Slip Joint Washer Assortment, are designed to be stretchy enough to slip into place and form a tight seal. They are also easy to install, which is why they are often recommended for plastic drains. These washers come in a variety of sizes and are well-regarded for their quality and effectiveness in stopping leaks.
When working with plastic drains, it is important to consider the potential risks of using materials like putty or silicone. While plumbers' putty is a common choice for metal drains, it may not be as effective on plastic. Putty does not set, so it can be used immediately after application, but it may not create a strong enough seal on plastic drains due to the difference in flexibility between metal and plastic.
Additionally, there is a concern that the oil in the putty could react with the plastic, causing the drain to break down over time. This is a slow process, but it is a valid concern for long-term use. Silicone is another alternative, but it can be more difficult to remove if changes or repairs are needed in the future.
Therefore, plastic washers are generally recommended as the best option for plastic drains. They are designed to work effectively with plastic, creating a strong seal without the risk of chemical reactions or damage to the drain. Plastic washers are readily available and easy to install, making them a convenient and reliable choice for plumbing projects involving plastic drains.
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Gaskets are an alternative to plumbers putty
Plumber's putty is a common sealant used in plumbing to create a watertight seal between surfaces. However, it is not recommended for use on plastic surfaces due to the risk of chemical reactions between the oil in the putty and the plastic, which can break down the plastic over time.
When dealing with plastic sink drains or assemblies, it is essential to consider alternative sealants or materials. Gaskets are one such alternative to plumber's putty. Gaskets are mechanical seals that create a tight seal between two surfaces, preventing leaks. They are typically made of rubber or foam and are designed to fit between two mating surfaces, providing a durable and reliable seal.
When installing a sink drain, it is crucial to ensure a watertight seal to prevent leaks and water damage. While plumber's putty is a popular choice for creating seals, it may not be suitable for all materials, including plastic. In such cases, gaskets offer a viable alternative. Gaskets are designed to work effectively with plastic sink drains and can provide a longer-lasting seal compared to plumber's putty.
One advantage of using gaskets over plumber's putty is their durability and resistance to temperature changes. Plumber's putty may not withstand constant temperature fluctuations, such as when running hot and cold water through the pipes. Gaskets, particularly those made of rubber, tend to last much longer and perform better under varying temperature conditions. This makes them ideal for use in sinks where hot and cold water is frequently used.
Additionally, gaskets can be easier to work with and provide a neater finish. Unlike putty, which can be messy and challenging to apply, gaskets are designed to fit precisely between mating surfaces, creating a clean and flush seal. This can make installation easier and reduce the risk of leaks or water pooling around the assembly. Furthermore, gaskets are often preferred by plumbers as they are easier to remove and replace compared to sealants like silicone, making future maintenance or repairs more straightforward.
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Frequently asked questions
Plumber's putty contains oils that can leach out and stain plastics.
Plumber's putty contains naphthenic oils, mineral oil, and vegetable oil.
Yes, you can use a plastic/rubber washer, silicone, or a non-staining version of plumber's putty.
Some people have used plumber's putty on plastic sink drains without any issues, but it is not recommended as the oils in the putty may react with the plastic and break it down over time.
Plumber's putty is a quick fix that can be used immediately after application and typically lasts as long as the sink drain.
