What is the classification for high tensile strength fiberglass used in aircraft structures?

High tensile strength fiberglass used in aircraft structures is classified as S-glass. This type of fiberglass is specifically designed to provide superior mechanical properties compared to other fiberglass types, with an emphasis on tensile strength, which makes it suitable for applications where high structural integrity is required, such as in aviation.

S-glass is characterized by its ability to withstand greater stress and strain, making it a preferred material in the aerospace industry for reinforcing composite materials. This allows for aircraft structures to be both lightweight and extremely strong, contributing to overall safety and performance.

In contrast, other types of fiberglass, such as E-glass, are more commonly used for applications where electrical insulation is important but do not offer the same level of tensile strength as S-glass. R-glass and T-glass also have specific properties but are not utilized in the same high-stress applications as S-glass fiberglass. Thus, S-glass stands out as the appropriate classification for high tensile strength fiberglass in aircraft structures.