Panlite shows stable tensile strength over a wide temperature range.  Especially, it will not show any conspicuous change in quality even under high temperatures.

Panlite G is a glass fiber reinforced grade, and its tensile strength increases as the glass fiber content increase.  For example, see Fig.1

Panlite shows stable flexural characteristics over a wide temperature range.

The flexural strength and the flexural modulus of Panlite G increase as the glass fiber content increases.

Panlite has outstanding impact characteristics.

For example, it shows a high Charpy impact value (nothed) of 67 kJ/m² or more at room temperature.

At temperatures below -20℃ or -30℃, although ductile fracture characteristics change to brittle fracture, the material shows a high value compared with other plastic materials(Fig.5).

If the designed product is unnotched and without sharp corners, stable impact characteristics are obtained over a wide temperature range, as brittle fracture at low temperature is eleminated.

It should be noted that the impact value is affected by the average molecular weight(Fig.6).

The impact value of Panlite G increase as the glass fiber content is increases(Fig.7).

Creep is a phenomenon that is characterized by an increse in the deformation of the material with time when a certain stress is given to the material.  Creep is related to both the temperature and the stress.

Panlite has outstanding creep characteristics(Fig.8).

In the case of Panlite and Panlite G, the apparent flexural modulus varies respectively due to the creep(Fig.9).

As for the relationship between creep deformation of Panlite and the designed stress, for example, when the material is subjected to the stress of 12.7 MPa at 20℃, the deformation after 20 years is 0.7%(Fig.10).

The rupture of material due to repeated fatigue occurs even when the stress is lower than its flexural strength.

The curve drawn by plotting tha values of repeated stress and the number of time of repetiton of the stress until the rupture occurs is called the S-N curve.  The repeated fatigue characteristics of Panlite can be improved largely by increasing the glass fiber content(Fig.11).

When a plastic part has been used for a long period of time under stress, crazing or cracking sometimes occurs.  The maximum stress at which neither crazing or cracking occurs is called allowable stress, and it varies depending on the operating temperature.  The allowable stress is the greatest stress under which a material is believed to be safe in actual use, and may also be called design stress.  Allowable stress varies according to the type of stress, but in all cases it has been determined after material testing, by service conditions and experiences(Table 1).

Since allowable stress is a maximum value, a safety allowance must be added when assuming the stress in service conditions.

For plastics, ball pressure temperature is specified by IEC Publication 335-1, UL746C, and Electric Appliances Control Law(regulation concerning technical standards). The ball pressure temperature of Panlite is on the higher side of all themoplastics(Table 5).

Panlite has high a reflective index as 1.585(nd) at normal temperatures.

In Fig.2, the temperature dependence of reflective index is shown.(Fig.2)