Which material, when cold, is more likely to break compared to when it is heated?

Optyl is a type of thermosetting plastic that exhibits particular physical properties. At lower temperatures, Optyl becomes more brittle, which increases its susceptibility to breakage. In contrast, when heated, Optyl becomes more flexible and resilient, allowing it to withstand stress without breaking. This characteristic makes it more fragile in colder conditions.

While materials like cellulose acetate and polycarbonate have their own thermal properties, they do not exhibit the same degree of increased brittleness with cold temperatures. Glass is also more fragile at lower temperatures but is often discussed differently compared to thermoplastics like Optyl when it comes to thermal effects on structural integrity. The unique response of Optyl to temperature changes makes it the most likely material to break when cold compared to its performance when heated.