ISO-HT^® and ISO-C1^® polyisocyanurate insulation is produced as bunstock in a continuous manufacturing process (take_tour). Isocyanurate, polyol, surfactants, flame retardants, and catalyst are pre-staged in tanks sized to provide in excess of 7 hours of continuous operation per run.

Bunstock production equipment can be adjusted to produce variable block dimensions depending on particular customer needs. Bun widths for a nominal 2 lb/ft2 density can vary from a trimmed 38 inches (96 cm) up to a trimmed 60 inches (1.52 m), with our standard sizes set at 48 inches (1.22 m). Bun lengths can vary from 36 inches (91.4 cm) (standard pipe chunks) up to 288 inches (7.31 m), with standard stocked sizes being the 72 (1.83 m) and 108 inches (2.74 m) lengths. The bun heights for other ISO densities will vary and bun width with typical trimmed bun heights given in the following table:

Note 1: all dimensions are given in the trimmed size. Add approximately 1.5" (3.8 cm) to 2" (5.1 cm) for actual untrimmed bun height.

Note 2: Metric dimensions above are rounded to the nearest significant digit..

This customized sizing capability can yield considerable cost savings by minimizing the need to "cut" to size - - thereby minimizing waste.

Our fabrication shop is capable of cutting sheet stock to any thickness, as thin as 0.125" (0.32 cm) thick, with +/- 0.03125" (0.078 cm) tolerances, making our cut sheet products ideal for demanding applications.

ISO-C1 and ISO-HT Sizing can be summarized as: