Technical Data
Property/ ThicknessUnit4mm6mm8mm8mm10mm10mm16mm
Structure Twin WallTwin WallTwin WallTriple WallTwin WallTriple WallTriple Wall X-Structure
Thermal Insulation BTU/hr-ft2ºF (ASTM C976/90)U-Value R- Value0.720.62 1.60.60 1.70.60 6.470.56 1.90.56 1.90.42 2.4
Cold Forming Radius (Minimum permisible)Inch29.539.449.
Heat expansion coefficientInch/ft °F4x10-44x10-44x10-44x10-44x10-44x10-44x10-4
Max. permanent service temperature w/o load°F250250250250250250250
Possible expansion due to Heat and MoistureInch/ Inch0.0030.0030.0030.0030.0030.0030.003
Weighted sound reduction indexdBN/A10N/AN/A16N/A21

Structural Considerations

Load Deflection

When Macrolux Multiwall twin wall sheet is used as a structural element in roofs and walls, the forces applied by wind and snow loads must be absorbed by a suitable structure. Also, adequate locking devices must be used to protect the whole structure (PC sheet and metal or wood structure) against wind suction.

The anticipated structural load values are specified in local building regulations. The total applicable load deflects the sheet. For safety and aesthetic reasons, the maximum bend should be limited to 5% of the dimensions of the shorter side of the sheet.

For a 4' wide sheet:

Maximum Purlin Spacing (inches) sheet deflection -1"
Load (lb-f/ft2)15304560

For a 6' wide sheet:

Maximum Purlin Spacing (inches) Sheet Deflection -1"
Load (lb-f/ft2)15304560

Heat Expansion Macrolux Multiwall PC sheet has a higher heat expansion coefficient than standard construction materials such as glass, steel and aluminum. Specific clearance between the sheet and the structural frame has to be calculated in order to ensure proper installation.

MaterialHeat Expansion Coefficient (inch/ftºF)
Macrolux Multiwall4 x 10-4
Glass5 x 10-5
Steel8 x 10-5
Aluminum1.6 x 10-4

Fire Behavior Macrolux Multiwall PC sheet is produced using high-quality polycarbonate resin made by Bayer. It does not burn easily and has been defined as a self-extinguishable material by international standards in different countries.

ASTM E84-01ClassA (NFPA); Class (UBC)
ASTM D635-74Class CC1
ASTM D2843-93Low Smoke Density (UBC standard No. 26-5)
ASTM D1929-68Self Ignition Temperature greater than 650ºCF

Light transmission

Change in the light transmission of PC sheet in time

Change in the yellowness index of PC sheet in time