Ethan Clarke
Salt is a compound that results from an acid-base reaction. It is used in various industrial processes, and the choice of materials used in manufacturing can significantly impact lifecycle costs. While metal piping is traditionally used in industrial plants, it is susceptible to corrosion by salt, leading to costly repairs and downtime. Plastics, on the other hand, are chemically inert to salts and are inherently resistant to all salts. This quality of plastics has raised concerns about salt contamination by plastic, with studies finding microplastics in salt from various regions. The presence of microplastics in salt has implications for human health, as it contributes to the growing issue of plastic ingestion through food and beverages.
Does salt damage plastic or rubber?
| Characteristics | Values |
|---|---|
| Plastic piping | All plastics are inherently resistant to all salts. |
| Plastic piping cost | Plastics outperform metals for sodium chloride and other salts in terms of cost. |
| Plastic corrosion | Plastics are chemically inert, so salt cannot corrode plastics as it does metals. |
| Rubber | Most rubbers are resistant to aqueous solutions and ionic compounds. |
| Saltwater solutions | When employing salts, brine, or other saltwater solutions in industrial processes, the piping material greatly impacts lifecycle costs. |
| Saltwater corrosion | Corrosion is a necessary evil when dealing with salts, but proper material selection (plastic) limits unnecessary repairs, downtime, and cost. |
| Salt and plastic contamination | Sea salt and table salt around the world have been contaminated by plastic pollution. |
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What You'll Learn
Plastics are chemically inert to salt
The chlorinated polyvinyl chloride (CPVC) type of plastic is inherently corrosion-resistant and has been proven to be reliable when dealing with salts. It has been tested against over 500 chemicals and compounds and has a higher operating temperature than other plastics. CPVC is also more affordable than specialty plastics, making it a cost-effective choice for industrial applications.
In contrast to metal, which requires expensive alloys or additional chemicals to delay corrosion, plastics do not require any special treatments to resist salt. This makes plastics the preferred choice for piping in industrial processes involving salt, as it helps to avoid unnecessary repairs and downtime.
While plastics are chemically inert to salt, it is important to note that salt can be contaminated by plastic pollution. Studies have found microplastics in sea salt and table salt from various countries, including the US, Europe, China, and Taiwan. This adds to the growing concern about the impact of plastic pollution on the environment and human health.
Overall, plastics are chemically inert to salt, making them a durable and cost-effective choice for industrial applications involving salt. However, the presence of microplastics in salt highlights the need to address the issue of plastic pollution to protect the environment and potentially human health.
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Salt can corrode metal, but not plastic
Salt is a compound resulting from an acid-base reaction. While salt can corrode metal, it does not affect plastic. Industrial plants that use metal piping for salt often face the challenge of corrosion, leading to costly repairs, downtime, and installation expenses. On the other hand, plastics are chemically inert to salts, meaning that floating ions pass over the material without causing any harm.
All plastics are inherently resistant to all types of salts. Chlorinated polyvinyl chloride (CPVC), for example, is a type of plastic that has been proven reliable in handling salts like sodium chloride. It has a higher operating temperature than cheaper plastics and is highly consistent across batches. CPVC's resistance to corrosion by salt gives it a clear advantage over metals in industrial applications.
The choice of piping material significantly impacts lifecycle costs in plants that employ salt solutions. While corrosion-resistant alloys like stainless steel are available, they come at a much higher price tag. Plastic pipes offer a cost-effective alternative that effectively resists corrosion by salt. This makes plastic the preferred choice for applications involving salts, helping to avoid unnecessary repairs and downtime.
The impact of salt on rubber was not explicitly mentioned in the search results. However, it is worth noting that alcohol can damage some types of plastics, as they are soluble in certain alcohols. Additionally, the presence of microplastics in salt has been a growing environmental concern, with studies detecting microplastic particles in sea salt and table salt from various countries.
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CPVC plastic is reliable at higher temperatures
Salt does not damage plastic. All plastics are inherently resistant to all types of salt. This is because plastics are chemically inert, meaning that salt cannot corrode plastic as it does metal.
Chlorinated polyvinyl chloride (CPVC) is a type of plastic that is reliable at higher temperatures. CPVC is an amorphous material, meaning that it does not crystallize and therefore does not have a melting temperature. As it heats up, it eventually becomes soft and flexible, but it does not melt. This temperature is called the glass transition temperature (Tg). The glass transition temperature of CPVC is much higher than that of other commonly used thermoplastic piping materials, such as PVC. CPVC can withstand temperatures up to 200° F before it starts to weaken, while PVC begins to soften and lose its shape at 140° F.
CPVC's ability to work at higher temperatures than other plastics makes it a good choice for applications dealing with salts, as it can avoid the unnecessary repairs, downtime, and installation costs associated with metal piping. CPVC is also more resistant to corrosion and deterioration than PVC due to its chemical composition, making it a more reliable option for industrial installations. It is a long-lasting solution for harsh industrial environments, where it can reliably transport aggressive chemicals at high temperatures and under pressure without corrosion concerns.
In addition to its heat resistance, CPVC is more flexible than traditional piping materials, making it simple to work with and giving it some impact resistance. It is also more affordable than specialty plastics like polypropylene random co-polymer (PP-R).
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Alcohol can damage some plastics
Salt does not damage plastic or rubber. In fact, all plastics are inherently resistant to all salts. This is because plastics are chemically inert, so salt cannot corrode plastic as it does metal.
Now, turning to the topic of alcohol and its effects on plastic:
Alcohol, specifically isopropyl or rubbing alcohol, can damage some plastics. While it does not dissolve plastics to a large extent, it can corrupt the surfaces of certain plastics, especially if they are shiny or polished. For example, compact polystyrene or polymethyl methacrylate, which are often clear and shiny, can turn cloudy or streaky when exposed to isopropyl alcohol. This is due to the alcohol's penetration of the plastic, which can be minimised with a quick wipe rather than soaking.
Isopropyl alcohol is a common household item with a variety of uses, including cleaning and stain removal. It is also used to make shapeable ice packs by combining one part alcohol with three parts water in a sealed plastic bag and freezing it.
Despite its versatility, isopropyl alcohol should not be used on all surfaces. In addition to potentially damaging some plastics, it can also damage protective coatings on items such as plastic tiles or glasses lenses. Therefore, it is important to exercise caution when using isopropyl alcohol to avoid unintended damage.
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Soaps and detergents can damage rubber
Plastics are chemically inert to salts, meaning that floating ions pass through plastic materials without causing any damage. All plastics are inherently resistant to all salts.
However, soaps and detergents can damage rubber. While standard cleaning agents are safe for most common rubbers, harsh chemicals like bleach can cause the rubber to crack, lose elasticity, or degrade. Synthetic rubber is generally safe when washed with soap and water. Natural rubber, on the other hand, is more susceptible to damage. If it is vulcanized, it should be unaffected by the moderately low pH of baking soda. If it is not vulcanized and is "raw", it may be more susceptible to damage.
When cleaning rubber, it is important to start by removing any loose dirt or debris with a soft brush. Then, a mild soap solution can be used, and a sponge or rag can be used to gently scrub the rubber. It is important to thoroughly rinse off any soap residue. For tough stains, a paste of baking soda and water can be used. However, it is important to avoid using direct heat to dry rubber, as this can cause damage. Instead, rubber should be allowed to air dry in a spot out of the sun.
Some manuals for plastic products specifically advise against using soaps or detergents, as they may cause odours.
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Frequently asked questions
No, all plastics are inherently resistant to all salts.
It depends on the type of rubber. Most rubbers are resistant to salts.
Salt can corrode metal.
No, plastics are chemically inert, so salt cannot corrode plastics as it does with metals.
It depends on the type of rubber. Most rubbers are resistant to salts, but it is always good to check the manual.
