How Does ASTM C 1289 Classify Foam Insulation?
Question:
How does ASTM C 1289 classify foam insulation?
Answer:
ASTM C 1289 is a standard developed by ASTM members that classifies the design requirements for a specific material, product, system and service. All faced rigid polyisocyanurate manufacturers are required to manufacture and test to the standards of ASTM C1289. This standard classifies faced polyiso panels by type, class, and grade.
Type
Refers to the facer material that is bonded to the foam. Below is a list of common types of facers used in the commercial wall market.
| Type | Description |
|---|---|
| I | Foil Facer |
| II | Glass Mat Faced |
| V | Plywood or OSB on one side, Fibrous Felt or Glass Mat on the other side. |
CLASS FOR TYPE I MATERIALS
For foil faced polyiso the “Class” designation refers to whether or not the foam core is glass fiber reinforced.
| Class | Description |
|---|---|
| 1 | Non-Reinforced Foam Core |
| 2 | Glass Fiber Reinforced Foam Core or Non-Reinforced Foam Core |
CLASS FOR TYPE II MATERIALS
For glass mat faced polyiso the “Class” designation refers to the material used in conjunction with the glass mat. Currently, all Type II polyiso products for commercial wall applications fall into the Class 2 category.
| Class | Description |
|---|---|
| 2 | Polymer Bonded Glass Fiber Mat both sides, Coated Glass |
| 3 | Glass Mat Only |
GRADE
Refers to the product’s compressive strength for permeable faced products. Compressive strength is reported in terms of PSI. Several polyiso products are available in multiple grades
| Grade | Description |
|---|---|
| 1 | 16psi min |
| 2 | 20psi min (Standard for most Xci products |
| 3 | 25psi min |
