Celotex thermax as illustrated by your first photo above was and is currently as a dow thermax product a foil faced insulating board comprised chiefly of foam insulation laminated with aluminum foil or possibly kraft paper.
Celotex tuff r insulation board.
View the full range of celotex and isover insulation products by size dimensions thickness and lambda values making specification of insulation easier for you.
Celotex offer pir thermal insulation boards in various thicknesses for new build and refurbishment applications for both the commercial and domestic sectors.
The other is a tri plex facer consisting of a three ply laminate of durable kraft with aluminum foil on both sides.
Foam insulation is energy star compliant and highly durable and moisture resistant.
Celotex tuff r ga4000 is a multi purpose rigid polyisocyanurate foam pir thermal insulation board with reflective foil facings that are uniquely reinforced with glass fibre and feature a strong reaction to fire performance when measured in accordance with new european standards.