I have worked most of my career examining release values and I must say, parchment paper is a genius kitchen item. It is admittedly non-adhesive, due to a thin, cured silicone, which is greatly decreasing the energy of the surface. In the industry we worry about being wetted and parchment does not want to be wetted with glues or paste. It makes me smile each time I watch a sticker/ cookie slide off easily. Parchment is acid-treated to give it a dense and heat-resistant property unlike a wax paper, which contains paraffin on its surface and melts when it is warmed. It forms a no fly zone of chemical bonds. I am an irrationally angry person when people mix up the two! Parchment is a serious tool. It imitates the glassine liners, which we make to costly industrial labels. It would just be crazy to me that you can shop this degree of chemical engineering in the grocery store.
Does not the parchment paper stick?
The parchment paper is the silent hero of the non-sticky world; and I know this after years of taking the molecular structure of adhesives and release liners apart. It is not merely a kitchen commodity, it is a complex item of material science which we tend to assume. This is the silicone coating, a cross-linked polymer which forms a barrier of low-surface-energy. Even the most combative adhesives or sticky materials will not have a place to clerk the fibres of cellulose. I am giddy at the sight of an ideal release because it embodies the epitome of the manipulation of surface tension. The attractiveness of this surface that is resistant to adhesive is self-evident since I have worked in the sticker business for several years. Most of the individuals put it in the category of waxy paper, which is totally wrong!
The sulfuric acid that is added to the parchment as it is treated in the parchmentization process to achieve a high density and heat resistance makes it different to the wax paper that can melt and leave a mess. Then comes the silicone. This coating indeed renders it repulsive and waterproof. Similar silicone-based release technology is applied in my research lab regarding high-end labels. It is also marvelous that a bond can be inhibited by such a small coating of siloxane. When you have ever attempted to remove a sticker on a surface of low-end material and succeeded in ripping it, you will understand why the quality of this coating is essential. It is very dependable even at high temperatures where other materials would buckle and melt. It is great work of engineering, by itself.
Is parchment paper non-sticky?
I have decades to ponder the question of why things cling together, or refuse to do so, and indeed, parchment paper is a lesson in surface tension. When we refer to it being non-stick, we are referring to the complexity of silicone molecules bound to a thick cellulose base. My lab does the same with release liners of high-end stickers every day, and the technology of your kitchen parchment is surprisingly similar. It involves the silicone impregnation process with a low-energy barrier. The strongest pressure-sensitive glues that are the most aggressive do not create a strong bond. I am thrilled that this object of everyday usage has the same cross-linking chemistry that we apply to labels of the factory grade! The paper itself is taken through an acid bath – of sulfuric, typically – which gelatinizes the fibers to render the paper grease-resistant and tough, followed by coating it with silicone.
I hate it when some people compare this with cheap wax papers. Wax is simple coating and parchment, transformed material. Viewed through a microscope, the silicone layer looks homogenous. When you attempt to use it as a temporary peelable backing to the custom stickers, you will always find the force of release to be high. This is because the silicone is heat-cured, which means that it cannot migrate or rub-off. I watch the water droplets beading up Sometimes I stand and stare at them–hydrophobicity at its best! It is a foible, but that ideal want of wetting causes a throb in my researcher heart. It is reliable material and is a staple to anyone who may be playing around with glues or cookies. It is not merely a kitchen equipment, it is also a high-performance release liner under wrap. Whenever I remove a sticker on silicone-treated backing, I cannot but remember how much we owe to this type of chemical structure. It is so effective; it appears as though adhesion is easy.
What are the drawbacks to parchment paper?
I am a true believer in silicone technology, but still I can see that parchment paper has its disadvantages. The most evident one is its unyielding memory of a curl; it is annoying to have a sheet of paper even when trying to fit the sticker sheet with the stickers since they are so sensitive. In addition, although silicone is a perfect release agent, it is also very slicky and thus may impede some secondary processes.
When you require a carrier sheet which is temporary to bond you will find that the low surface energy causes a very low possibility of anything anchoring properly. The temperature restrictions also annoy me; at temperatures above 450 o C, cellulose fibers start to pyrolyze, and the paper becomes brittle and charred. The price factor and recyclability is a factor and most recycling facilities will not accept silicone impregnated paper, this bothers my environmental feelings. It is a great but faulty medium.
Is parchment paper cookie non-stick?
I have twenty years of experience in the measurement of the release force of pressure-sensitive adhesives, and, consequently, I can tell you that a cookie on parchment paper is basically an edible sticker that has been removed off a high-quality silicone-treated liner. The silicone coating is even more useful in resisting molten sugars and fats which are liquid glues prior to solidification and are encouraged by the heat of the oven.
I am at peace when I watch a chocolate chip masterpiece slip out of the surface leaving no traces. Having a higher surface energy, the sugars would caramelize and fix onto the fibers, thus destroying the snack. The parchmentization process makes the sheet dense and therefore does not allow grease to penetrate it, but it is the cross-linked silicone that does the upper work. These release liners can be given credit on their ability to withstand high temperatures. I cannot look at a batch release without my researcher heart stopping dead, that is the best expression of chemical repulsion. It is inconceivable that people are still using non-greased pan despite the availability of such technology.
