Product Review

KYDEX® V
KYDEX® V sheet has excellent forming properties, which results in uniform wall thicknesses and crisp detail. KYDEX® V sheet forms to deep draws with low forces when heated to the upper end of the forming temperature range. Unlike many other thermoforming sheets, KYDEX® V sheet has unusually high resistance to hot tearing.

Forming Guidelines
- Oven temperatures should be set differently than the settings used for ABS or FR-ABS.

- Typical heater settings (percentage timers) are 30% - 50% top heaters and 50% - 70% bottom heaters.
- The most frequent problem is trying to heat the sheet too quickly, particularly on the primary surface.
- Cycle times will vary depending on the oven conditions and grade of KYDEX® V sheet being formed.
- When forming KYDEX® V sheet, it is better to rely on the sheet appearance during heating than on fixed cycle times.
- Forming temperatures - Guidelines: (Sheet should not exceed 204°C (400°F).

165 - 177°C (330 - 350°F) for < 1.50mm (0.060").
182 - 196°C (360 - 385°F) for 1.50mm to 3.20mm (0.060" to 0.125").
196 - 204°C (385 - 400°F) for > 3.20mm (0.125")

- Ideally the core sheet temperature should be within 10°F of the surface temperature.

Sheet Appearance During Heating
As KYDEX® V sheet is heated, the inherent stresses in the sheet will relax.

• Stage I: The heating is marked by wide undulations and softening.

• Stage II: The material will start to form small ripples (known as oil canning). .

• Stage III: The material will start to smooth out and sag (KYDEX® V sheet will generally sag less than other thermoplastics due to its high melt strength. .

• Stage IV: The ripples will have smoothed out indicating that most stresses have been removed. 10 to 30 seconds afterwards the sheet is ready to form.