WJEC Design Technology Practice Exam

Melamine formaldehyde is a thermosetting resin that forms a highly crosslinked, rigid network when cured. That crosslinking makes the material hard, durable and resistant to chemicals, so its surfaces do not easily stain or react with many substances. Because it’s crosslinked, it doesn’t soften or melt when heated; instead, it resists heat until it can decompose or char. It also doesn’t conduct electricity well, acting as an electrical insulator. These traits—hardness, heat and chemical resistance—fit the description of being strong and resistant to most chemical stains.