Terkar Formula refers to the patented formula used in all Irwin Window extrusions. Taking 14 years of research and development to perfect, it was designed to withstand the extremes in weather. It is guaranteed to save energy 12 months a year and will last for years, and years, and years...

FEATURES:

• ONLY 100% PRIME VIRGIN RESIN used
     -no recycled content

• Has incredible memory
     -scratches and dents are easily repaired

• HAS 25% MORE IMPACT MODIFIERS
     -means less breakage, much stronger

• HAS 25% MORE TITANIUM DIOXIDE
     -stays its original color longer

• HAS 25% LESS CALCIUM CARBONATE
     -fillers add no value to the formulation