Lena Rivera
Paint is one of the most common dangerous goods shipped globally by road, rail, sea, and air. Paint may be transported as a raw material or finished product, and its composition varies depending on its intended use. For example, paints used on railcars need to be durable enough to withstand severe weather and impact. Paint ingredients may include solvents, fillers, pigments, binders, and additives, some of which may be toxic or corrosive. For instance, some paints contain lead pigments, which are toxic, while others may include corrosive materials or fracking by-products. As such, the transport of paint and paint-related materials is subject to strict regulations, such as the UN's hazardous materials classification system, which dictates packaging and labelling requirements.
| Characteristics | Values |
|---|---|
| Paint ingredients hauled by rail | Enamels, stains, thinners, titanium dioxide, silica, alumina, zirconium, solvents, lacquers, nitrocellulose, dyes, acrylic-based coatings, sub-micrometer polymer particles, synthetic polymers (acrylic, vinyl acrylic (PVA), styrene acrylic), binders, pigment, filler, iron, lead, quartz sand, rubber |
| Railcar coatings | Water-borne and solvent-borne coating systems |
| Railcar coating companies | Sheboygan Paint Company |
| Railcar coating machines | Graco hydracat, Graco plural system, airless systems |
| Railcar coating types | Epoxy, polyurethane, plural component coatings, high solid epoxies, surface-tolerant coatings, solventless epoxy |
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What You'll Learn
Paint is classed as a dangerous good
The US Department of Transportation (DOT) and the International Air Transport Association (IATA) have specific regulations for hazardous materials, including paint. These regulations ensure that hazardous materials are properly classified, packaged, labelled, handled, and transported to protect workers, emergency responders, and the general public.
Paint can contain toxic pigments, such as lead, which was previously used in paint until it was banned for residential use in 1978. Lead pigments pose health and environmental risks, which is why paint is considered a hazardous material. Additionally, some paints may contain solvents that can be flammable or have other hazardous properties.
To determine if a specific type of paint is classified as a hazardous material, one can refer to the Safety Data Sheet (SDS), formerly known as the Material Safety Data Sheet (MSDS). This document provides information on the product's hazard classification and transportation requirements. The SDS is typically available on the manufacturer's website or through a web search using the product name and "SDS" or "MSDS" as search terms.
When shipping paint, it is essential to follow the regulations and guidelines provided by organizations like IATA and DOT to ensure safe transportation and compliance with legal requirements.
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Titanium dioxide is a common ingredient
Toxic pigments, such as lead, can be found in some paints. However, paint manufacturers have replaced these toxic pigments with titanium dioxide (titanium white), enhancing the safety and performance of their products. This shift towards titanium dioxide as a common ingredient in paint formulation ensures that paints are not only less harmful but also offer improved durability and opacity.
The use of titanium dioxide in paint is strategically chosen for its specific benefits. By coating the titanium dioxide particles with silica, alumina, or zirconium, manufacturers enhance the exterior durability of the paint. This coating process creates a protective barrier, allowing the paint to withstand external factors such as weather conditions and abrasion. As a result, surfaces coated with titanium dioxide-based paints are more resistant to fading, peeling, or other forms of deterioration over time.
Additionally, titanium dioxide plays a crucial role in achieving optimal opacity in paints. The coating process involving silica, alumina, or zirconium optimizes the spacing within the paint film, enhancing the hiding performance. This property ensures that the paint effectively hides the underlying surface, providing a more uniform and aesthetically pleasing appearance. This feature is particularly advantageous in applications where complete coverage and a smooth finish are desired.
The versatility of titanium dioxide in paint formulations is also noteworthy. By adjusting the coating materials and their ratios, manufacturers can tailor the properties of titanium dioxide to suit specific paint requirements. This customization allows for variations in durability, opacity, and other performance characteristics, making titanium dioxide a versatile ingredient in paint formulations across different industries and applications.
In conclusion, titanium dioxide is a prevalent and essential ingredient in modern paint formulations. Its widespread use stems from the advantages it offers in terms of safety, durability, and opacity. Through strategic coating processes and customization, paint manufacturers can harness the benefits of titanium dioxide to create high-performance, long-lasting paints that meet the diverse needs of their customers. This common ingredient plays a pivotal role in enhancing the overall quality and functionality of paints used in a variety of contexts.
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Some pigments are toxic
While paints contain various ingredients, some of their pigments can be toxic. For instance, lead pigments in lead paint are toxic. In the 1700s, the Dutch were aware of the toxic nature of lead but still used it due to its durability and brightness. Even today, some artists continue to use lead paint despite its known toxicity. Lead paint was eventually banned in 1978 by the US Consumer Product Safety Commission, and it is now banned in most places worldwide for house paint. Vermilion, a paint pigment originally made from the toxic mercuric mineral cinnabar, has also been phased out due to toxicity concerns.
Other toxic pigments include cadmium, copper, cobalt, and chromium. Cadmium Red, for example, is highly toxic, and even its less toxic alternative, Cadmium Red Hue, is not as opaque. Uranium Yellow, as the name suggests, is radioactive. Chrome Yellow, or lead chromate, was used by Van Gogh, who had a habit of licking his paintbrushes. While the link between lead poisoning and Van Gogh's mental deterioration is speculative, lead's toxicity is well-established.
It is important to note that paint manufacturers are required to provide Material Safety Data Sheets (MSDS) on their websites. Additionally, hazard warnings on paint tubes can indicate the presence of toxic pigments. When working with toxic pigments, it is crucial to follow safety guidelines, such as wearing gloves, using a brush holder, and washing hands thoroughly after each painting session.
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Lacquers are unsuitable for chemical resistance
Lacquers are finishes that are harder and more brittle than oil-based or latex paints and are usually applied to hard and smooth surfaces. They are commonly used on wood or metal. Lacquers are unsuitable for chemical resistance due to the following reasons:
Firstly, lacquers are formed by the evaporation of solvents. A solid film is formed when the solvent evaporates, and this film can re-dissolve in a solvent. This makes lacquers unsuitable for applications where chemical resistance is important. Classic nitrocellulose lacquers, non-grain raising stains, and modern acrylic-based coatings fall into this category. Lacquers generally have lower corrosion resistance than comparable systems that cure by polymerization or coalescence.
Secondly, lacquers may contain toxic chemicals and harsh solvents, which can be hazardous to health and the environment. Waterborne lacquers, for example, are more environmentally friendly and less toxic than other lacquers, but they are more prone to wear and tear. Lacquers may also contain common solvents such as toluene, xylenes, methyl ethyl ketone, formaldehyde, and methanol, which may be concerning to some consumers.
Thirdly, certain types of lacquers, such as nitrocellulose lacquers, are prone to yellowing, cracking, and crazing over time, which can be unattractive and affect the durability of the finish. Nitrocellulose lacquers, for instance, tend to carry a reddish-amber tint as they age, which may be undesirable on lighter woods like maple or ash.
Finally, some lacquers may not offer adequate protection against liquids, chemicals, and abrasions. While urushiol-based lacquers, for instance, produce very hard and durable finishes that are resistant to water, acid, alkali, and abrasion, nitrocellulose lacquers do not protect well against these elements.
In conclusion, lacquers are unsuitable for chemical resistance due to their susceptibility to re-dissolving in solvents, the presence of toxic chemicals, the potential for yellowing and cracking, and limited protection against certain elements. While lacquers provide a hard and durable finish, they are not designed to withstand chemical exposure and may degrade or be damaged as a result.
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Some paints are corrosive
While paints are typically used to protect surfaces from corrosion, some paints themselves are corrosive. Corrosive paints can cause severe injury or even death if inhaled, ingested, or if they come into contact with skin or eyes. Methyl bromoacetate, for example, is an eye irritant and lachrymator (a substance that causes tears). Contact with molten corrosive paint can cause severe burns to the skin and eyes. Corrosive paints can also produce toxic gases when exposed to fire, leading to environmental contamination.
Corrosive paints are typically composed of various compounds, including acid/base sludge, alkylamines, alkyl phenols, alkyl sulfonic acids, aryl sulfonic acids, organotin pesticides, and isophorone derivatives. These compounds can react with metals to produce hydrogen gas, posing additional risks.
It is important to note that not all oil-based paints are anti-corrosive. While they offer some protection against climatic corrosion, they may not withstand the harsher corrosion caused by industrial chemicals and gases. Anti-corrosive paints, on the other hand, are designed to protect metal surfaces from degradation due to moisture, salt spray, oxidation, and exposure to environmental or industrial chemicals. They achieve this by impeding the direct access of air and water to the metal, creating a barrier against corrosive materials.
Anti-corrosive paints are formulated with corrosion-resistant pigments such as zinc chromate, lead chromate, zinc oxide, zinc dust, and red lead. Linseed oil is used as a binder in these paints. They are applied to metallic surfaces, including ferrous metals, cast iron, and steel, to provide preservation against acid fumes and adverse weather conditions. Anti-corrosive paints also offer rust prevention, water resistance, and impact resistance.
When dealing with corrosive paints, it is crucial to follow safety precautions. In the event of a spill or leak, the area should be isolated and evacuated, and precautionary measures such as wearing protective clothing and respiratory equipment are essential. If there is a fire involving corrosive paints, it is recommended to fight the fire from a maximum distance or use unmanned devices, and to never get water inside the containers.
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Frequently asked questions
Paint typically contains a binder, solvent, and pigment/filler. Some paints may also contain additives, which are usually added in small amounts but have a significant effect on the final product.
Yes, paint is considered a hazardous material and is subject to specific regulations for shipping. For example, UN1263 paint, or paint-related materials, fall under hazard class 3 flammable liquids.
Yes, railcars often require durable coatings that can withstand severe weather and impact. Specialty coatings, such as those with rubber linings, may also be used for hauling corrosive or sensitive materials.
