Does glass resist corrosion in alkaline anti-corrosive media?

The corrosion resistance of fiberglass-reinforced plastic depends primarily on the type of resin used; different resin types result in significant variations in the corrosion resistance of such materials. Within a pH range of 1–12, as long as there are no strongly oxidizing acids such as nitric acid or hydrofluoric acid present, fiberglass reinforced with many corrosion-resistant resins can fully ensure reliable performance.

Under normal circumstances, fiberglass reinforced with glass cloth cannot be used in alkaline environments. It is recommended that you use polyester fabric to replace glass fiber.

Glass generally cannot withstand alkaline environments as it is prone to corrosion.

I. Epoxy resin fiberglass: Epoxy resin fiberglass is a commonly used type of fiberglass, and it has a light-colored, semi-transparent appearance. It features good corrosion resistance, high mechanical strength and strong adhesion, as well as certain electrical insulation and alkali resistance. Its raw material, epoxy resin, is a light-yellow, high-viscosity transparent substance; there are many types of it, with commonly used grades including 6101, 634, 637, 618, etc. 　　II. Unsaturated polyester fiberglass: Polyester fiberglass is also a commonly used type of fiberglass; it is light yellow in color and semi-transparent. It possesses certain corrosion resistance, high mechanical strength, strong adhesion, as well as moderate low-voltage electrical insulation properties. Additionally, polyester fiberglass does not emit any volatiles during the curing process, can be molded at room temperature and under pressure, and features convenient curing procedures. Its raw material, polyester resin, is a light yellow transparent substance. There are many types of it, with common models including 306, 307, 196, 198, 199, 7541, 3301, etc.; each of these models possesses different levels of corrosion resistance and temperature tolerance. 　　III. Phenolic resin fiberglass – Phenolic resin fiberglass is also a commonly used type of fiberglass; it has a dark brown color. It possesses high corrosion resistance, but its mechanical properties are poor. It is suitable for lining containers made of metal, cement, wood, or stone. Its raw material, phenolic resin, is one of the earliest synthetically produced resins, with a history of over 60 years; common models include 213, 2130, 101, 102, 103, etc. 　　IV. Furan resin fiberglass: Furan resin fiberglass is black in color. Although its mechanical properties are poor, it boasts excellent corrosion resistance – it is resistant to both acids and alkalis – as well as high heat resistance. It outperforms other resins such as those based on phenol. This type of fiberglass is suitable for lining containers made of metal, cement, wood, or stone. The raw materials for furan resins include furfuryl alcohol, furfural, and furfuroic acid, among others. FRP not only possesses advantages such as light weight, high strength, electrical insulation, non-magnetism, and resistance to extreme temperatures, but it also has excellent properties including resistance to acids, alkalis, and oils. In recent years, it has been widely used in the manufacture of various chemical processing equipment and devices, helping to address corrosion issues in industries such as chemistry, metallurgy, petroleum, light industry, and textiles

There’s no problem with fiberglass; the key is to use the right material, and that covers 80% of the requirements. The other thing is to control the manufacturing process.

GFRP is the scientific name for glass fiber reinforced plastic. It is a composite material that uses glass fibers and their products (such as glass cloth, tape, mat, yarn, etc.) as reinforcing materials, with synthetic resin as the matrix material. The concept of composite materials refers to a situation where a single material does not meet the required specifications; in such cases, two or more materials are combined to create another material that can fulfill those requirements – and this is what constitutes a composite material. For example, single glass fiber, although highly strong, has loose fibers between them; it can only withstand tensile forces, not bending, shear, or compressive stresses, and it is also difficult to shape into a fixed geometry, making it a soft material. If they are bonded together with synthetic resin, various rigid products with fixed shapes can be created, capable of withstanding tensile stress as well as bending, compressive, and shear stresses. This constitutes a glass fiber-reinforced plastic matrix composite. Due to its strength, which is comparable to that of steel, and its inclusion of glass components, it possesses properties such as the color, shape, corrosion resistance, electrical insulation, and heat insulation characteristics of glass. As a result of these features, it has come to be known by the easy-to-understand name \"fiberglass\" over the years. It is lightweight yet strong: its relative density ranges from 1.5 to 2.0, which is only 1/4 to 1/5 of that of carbon steel. Yet its tensile strength is close to, or even exceeds, that of carbon steel, while its specific strength can compare with that of high-grade alloy steels. Therefore, it offers excellent performance in applications such as aviation, rockets, spacecraft, high-pressure containers, and other products where reducing weight is necessary. The tensile, bending, and compressive strengths of certain epoxy FRPs can exceed 400 Mpa. The density, strength, and specific strength of some materials are shown in Table 1-1. (2) Good corrosion resistance: FRP is an excellent material resistant to corrosion; it exhibits strong resistance to the atmosphere, water, acids, alkalis, and salts at normal concentrations, as well as various oils and solvents. It has been applied in various aspects of chemical industry corrosion protection, and is replacing carbon steel, stainless steel, wood, non-ferrous metals, etc. (3) It has good electrical properties and is an excellent insulating material used for manufacturing insulators. It maintains good dielectric properties at high frequencies. Microwaves pass through it well, and it is widely used in radar radomes. (4) Good thermal properties: FRP has a low thermal conductivity, ranging from 1.25 to 1.67 kJ/(m·h·K) at room temperature; this is only 1/100 to 1/1000 of that of metals, making it an excellent insulating material. Under instantaneous ultra-high temperature conditions, it is an ideal thermal protection and ablation-resistant material that can protect spacecraft from the impact of high-speed airflow at temperatures above 2000°C. (5) Good designability: ① Various structural products can be flexibly designed as needed to meet usage requirements, enabling the products to have excellent integrity. ②Materials can be carefully selected to meet the performance requirements of the product; for example, it is possible to create products that are resistant to corrosion, capable of withstanding sudden high temperatures, having extremely high strength in certain directions, or possessing good dielectric properties, among other things. (6) Excellent processability: ① The molding process can be flexibly selected based on the product’s shape, technical requirements, application, and quantity. ②The manufacturing process is simple, allowing for one-time molding; it offers excellent economic benefits. Its advantages in terms of manufacturing process are particularly evident for products with complex shapes that are difficult to mold in small quantities.

Fiberglass reinforced with glass fiber cloth cannot be used in alkaline environments. Polyester fabric can be used as a replacement for glass cloth

As long as the temperature does not exceed 80 degrees Celsius, there will be no problem!

There are many types of fiberglass resins, each with a different cost-performance ratio; you can ask the manufacturers who supply the resins.