POM examples of stress at yield retention versus temperature C

For long-term heat ageing, property retention depends on the property and grades considered, notably the heat stabilizers used. Impact strength and elongation at break are especially heat-sensitive characteristics. 

At low temperatures, the behaviour can be reasonably good down to -40°C or even -60°C, according to the grades and the mechanical constraints undergone. 

At -55°C, the elastic modulus is 39% higher than the value at -i-20°C for some neat grades. At -40°C, notched Izod impact strengths are  

These results relate to some grades only and cannot be generalized. 

Acetals are whitish and translucent to opaque according to the grade, crystallinity and thickness. 

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Figure 4.81. POM examples of stress at yield retention (%) versus temperature (°C)...

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