Greaseproof Baking Paper: A Comprehensive Technical OverviewWhat is Greaseproof Baking Paper?Greaseproof baking paper, also known as parchment paper, is a cellulose-based composite paper that undergoes a specialized chemical treatment process to achieve its non-stick and heat-resistant properties. The paper is produced through a supercalendering process where it is passed through a series of high-pressure rollers, compressing the fibers and creating a dense, smooth surface with a porosity rating of less than 5 mL/min (as measured by the Gurley densometer method). This treatment reduces pore size to approximately 1-10 micrometers, creating a barrier that prevents fats and oils from penetrating with an oil holdout rating of Kit 12 according to TAPPI T559 standards. The paper typically has a basis weight ranging from 35-40 g/m² and can withstand temperatures up to 220-230°C (428-446°F), with some silicone-coated variants rated for temperatures as high as 260°C (500°F). The surface tension of treated paper measures below 30 dynes/cm, creating the non-stick characteristic that provides a release coefficient of friction of approximately 0.2-0.3.
Key Characteristics with Technical DataThe exceptional performance characteristics of greaseproof baking paper are quantifiable through several precise measurements:Heat Resistance: Standard greaseproof paper maintains structural integrity at temperatures up to 220°C (428°F) for extended periods, with a melting point of approxima