Advancing Composite 

Foam Core Technology

ISO-CF/4.0 Foam Core Datasheet

ISO-CF®/4.0 Polyisocyanurate Insulation

4.0 lb/ft³ (64 kg/m³) density

ISO-CF/4.0 is Dyplast’s foam core product within its polyurethane/polyisocyanurate line of products. [Polyisocyanurate (polyiso or PIR) is a modified polyurethane, achieving improved physical properties such as dimensional stability]. Dyplast produces ISO-CF as continuous foam bunstock with the ability to custom size the bun - - which we then cut into custom thicknesses, widths, and lengths (for example, 24-foot panels or blocks) or shapes to very high tolerances. Dyplast utilizes a variety of CAD-based cutting and shaping equipment, controlled by highly trained technicians to fabricate customized single or mass-produced shapes and special parts. Contact us at 800-433-5551 or log on to our website to present your requirements.

Light-weight ISO-CF/4.0 has an excellent compressive strength at 81 psi (561 kpa) achieving strength to weight ratios higher than alternative foam core products. Improved flexibility characteristics can also be achieved in applications where it is an important property. ISO-CF is also available in higher densities of 2.0, 2.5, 3.0, and 6.0 lb/ft3, each with increasingly improved strength profiles. ISO-CF/HT is useful in higher temperature applications up to 350°F (177°C).

Our proprietary production process utilizes hydrocarbon blowing agents creating a portfolio of ISO-CF products with an extremely low Global Warming Potential (GWP). ISO-CF/4.0 is independently tested and audited, and is listed with FM as a Specification Tested Identified Component - Combustible Core for Insulated Building Panels under FM 4880. ISO-CF is useful in foam core applications from -297 to +300°F (-183 to +149°C).


ISO-CF has higher thermal efficiency than competing foam cores, which can offer benefits sometimes not considered. For instance, ISO-CF based composite panels used in transportation containers will require less additional insulation. Similarly, composite panels using ISO-CF on boats may offer warmer, or cooler, environments than would be otherwise be achieved with other foam cores - - while offering comparable or superior strength characteristics. Compliance with ASTM C591-15 ensures certain physical properties were tested over the various temperatures encountered in some applications.


Water absorption within foam cores can compromise certain physical properties. ISO-CF/4.0’s excellent resistance to water absorption (0.6%) as measured in accordance with Test Method ASTM C272 helps ensure long-term performance. In the unlikely event of a failure of the outer laminates, ISO-CF offers an additional layer of protection. Note that water absorption for different foam cores is often measured by different ASTM Test Methods, making comparisons challenging. For instance, ISO-CF’s WA of 0.6% was based on C272’s 24 hour period of immersion; comparable foam cores can be measured from as little as a 2 hour immersion period.

For optimum performance and longevity, some foam core systems must be designed to additionally control condensation. This requires a combination of thermal control and water vapor permeability. No other foam cores offers ISO-CF’s combination of high thermal efficiency and low permeability.