Chloe Zhang
Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal with similar properties to lead. Bismuth has a variety of applications, including in alloys, pigments, cosmetics, and pharmaceuticals. Bismuth-based pigments, for example, are used in plastics to improve heat stability and provide a wide range of colours. Bismuth is also added to plastics in the form of granules to increase their weight.
| Characteristics | Values |
|---|---|
| Bismuth-based pigments | Exceptional durability and superior functionality |
| Bismuth Vanadate pigments | Bright yellow, highly saturated, outstanding opacity/hiding power, chemical resistance, excellent weathering and durability |
| Bismuth Vanadate | Clean chromatic greenish yellow shade |
| Bismuth Nitrate | One of the most common starting materials for synthesizing Bismuth complexes |
| Bismuth-based pigments | Wide colour gamut, spanning from green shade yellows to orange hues |
| Bismuth-based pigments | Excellent weather fastness along with exceptional heat stability |
| Bismuth | Used in plastics to make them heavier |
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What You'll Learn
Bismuth Vanadate pigments
Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal with similar chemical properties to arsenic and antimony. Bismuth vanadate, or BiVO4, is an inorganic compound and a representative of "complex inorganic coloured pigments" (CICPs). It is a bright yellow solid with a slight green tint and is used as a pigment in paints and plastics.
Bismuth-based pigments have exceptional durability and functionality, making them well-suited for coatings and plastics applications. They cover a wide range of colours, from green-shade yellows to orange hues. These pigments can be used in a variety of resins and plastics, including PVC, polyolefins, polyamide, polyester, styrenics, and EPL.
The first Bismuth Vanadate pigments were formulated in the mid-1970s, with commercial introduction in the coatings and plastics markets occurring in the 1990s. Since then, there has been continued innovation in this pigment chemistry, and in 2015, a groundbreaking Bismuth orange with a unique colour index was launched. Bismuth vanadate pigments are created by slowly adding a solution of sodium vanadate to a solution of bismuth nitrate.
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Bismuth-based plastics
Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal with similar chemical properties to arsenic and antimony. Bismuth has a variety of applications, including in alloys, paints, cosmetics, and pharmaceuticals.
Bismuth-based pigments have been used in the plastics industry for over 35 years. These pigments are created using Bismuth Vanadate, a compound formulated in the mid-1970s. Bismuth Vanadate pigments are bright yellow and highly saturated, with excellent opacity and hiding power. They are known for their outstanding heat-fastness, light-fastness, and chemical resistance, making them ideal for low-warping applications. Bismuth Vanadate pigments are a suitable alternative to lead chrome pigments and can be used in a wide range of plastics, including PVC, polyolefins, and engineering polymers such as polyamide and polyester.
In recent years, there has been continued innovation in Bismuth pigment chemistry, leading to the development of new colours. For example, Bismuth Orange, with a unique colour index of PO.86, was introduced in 2015. This pigment is the cleanest pure inorganic orange and is suitable for use in polyolefin-based plastics, providing formulators with a unique opportunity to create orange shades while optimising performance.
Boric acid has historically been used to improve the heat stability of Bismuth-based pigments in engineering plastics. However, due to global regulatory restrictions, the use of Boric acid has decreased, and the industry is now trending towards Boric-acid-free pigments. These new pigments offer a wider colour palette for plastic customers while avoiding manufacturing issues associated with the release of water during processing.
Overall, Bismuth-based pigments have exceptional durability and superior functionality, making them well-suited for a variety of coatings and plastics applications. With continued innovation, these pigments are becoming the alternative of choice for heavy metal-based formulations in the plastics industry.
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Bismuth as a weight
Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. It is a brittle metal with a silvery-white colour when freshly produced, which can take on a rosy or iridescent hue as it oxidises. Bismuth is the most diamagnetic element and has one of the lowest thermal conductivities of all metals.
Bismuth is known for its high atomic weight and density, weighing 9,808 kg/m³. Bismuth is 86% as dense as lead, with a density of 9.78 g/cm3 compared to lead's 11.32 g/cm3. This small difference in density means that bismuth can be used as a substitute for lead in many applications where a dense material is required. For example, bismuth has replaced lead in fishing sinkers, shot, bullets, and less-lethal riot gun ammunition.
Bismuth is also used as a weighting agent in other applications, such as in bismuth-impregnated latex shields for medical X-ray examinations. Bismuth is considered non-toxic, which makes it suitable for use in food processing equipment and copper water pipes. Its low toxicity and high density have also led to its evaluation as a replacement for lead in free-machining brasses for plumbing applications.
In addition to its use as a weighting agent, bismuth is used in alloys with other metals such as tin and lead. Bismuth's unusual propensity to expand as it solidifies makes it useful in high-precision casting, such as in dentistry to create models and moulds. Bismuth is also used as an alloying agent in the production of malleable irons and as a thermocouple material.
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Bismuth in cosmetics
Bismuth is a heavy metal element that is often added to cosmetics as a pigment, filler, or preservative. It is also used in pharmaceuticals and paints. Bismuth oxychloride, a compound derived from bismuth, is commonly used in cosmetics to give them a pearly-shimmer and a luminous and glowing effect. It is also added to cosmetics to make them last longer and to help "hide" wrinkles and age spots.
While bismuth is considered safe for many people, it can cause adverse reactions in some individuals, particularly those with sensitive or acne-prone skin. One of the primary concerns associated with bismuth in cosmetics is its potential to cause skin irritation, sensitivity, and clogged pores, which can lead to acne breakouts. Bismuth particles are relatively large and can sit on the surface of the skin, trapping bacteria, dirt, and sebum. This can result in itching, redness, rashes, or even acne-like breakouts.
In some cases, bismuth can also trigger allergic reactions in susceptible individuals, ranging from mild symptoms such as itching and hives to more severe manifestations like swelling, difficulty breathing, or anaphylaxis. Some people may also experience feelings of heat, tingling, or discomfort, known as the "bismuth oxychloride itch," when using cosmetics containing bismuth.
The use of bismuth in cosmetics has also raised concerns about its environmental impact. The mining and extraction of bismuth can contaminate soil and water and disrupt natural habitats. Additionally, the improper disposal of bismuth-containing cosmetics can contribute to environmental pollution.
Due to these potential risks, some natural and organic makeup companies choose to avoid using bismuth in their formulations, opting for alternative ingredients like ethically sourced sericite mica instead.
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Bismuth in glass production
Bismuth is a chemical element with the symbol Bi and atomic number 83. It is a post-transition metal with chemical properties resembling arsenic and antimony. Bismuth is considered a metal in the periodic table but shares more similarities with semi-metals. It is a rare element on Earth, with an estimated natural abundance of 0.2 parts per million.
Bismuth has been used for centuries and has a variety of applications. It is often used in the manufacture of alloys, pigments, cosmetics, and pharmaceuticals. Bismuth has also been evaluated as a non-toxic replacement for lead due to its low toxicity and similar effects.
In glass production, the substitution of lead with bismuth has gained attention for environmental protection. Lead bismuthate glass, for example, has become useful in the industrial and electrical sectors. It has a large transmitting window, including infrared (IR) and UV-visible wavelengths, making it suitable for spectral devices, optical switches, laser materials, and more. However, lead bismuthate glass is challenging to produce as it tends to crystallize during the glass-forming process, resulting in a less translucent product.
Bismuth-germanate glasses are another type of glass that contains bismuth oxide (Bi2O3) as one of their main structural units. These glasses have potential applications in broadband near-infrared spectral range fiber lasers and nonlinear optical glass ceramics. The growth in bismuth oxide content leads to an increase in density and refractive index, impacting the spectral and luminescent properties of the glass.
Overall, bismuth plays a significant role in glass production, particularly as an alternative to lead, offering potential environmental benefits and unique optical properties for various applications.
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Frequently asked questions
Yes, some plastics contain bismuth. Bismuth Vanadate (BV) is a pigment used in plastics that has been found to have excellent heat stability, light-fastness, and chemical resistance.
Bismuth-based pigments have exceptional durability and superior functionality that make them well-suited for a variety of coatings and plastics applications. They also have a wide colour gamut, spanning from green-shade yellows to orange hues.
Bismuth Vanadate is a bright yellow, highly saturated pigment with outstanding opacity and hiding power. It was first formulated in the mid-1970s and has since been used in plastics, coatings, and paints.
Bismuth Vanadate provides excellent heat-fastness, light-fastness, and chemical resistance across all colour depths. It is also an exceptional product for low-warping applications and has a clean chromatic greenish-yellow shade.
Yes, there are alternatives to using Bismuth in plastics. One example is the use of tungsten powder, which is heavier and therefore requires a smaller amount to be used.
