Contents 1 Viscoelastic properties 2 Production 3 See also 4 References 5 External links

Viscoelastic properties[edit] Naturally occurring asphalt/bitumen, a type of pitch, is a viscoelastic polymer. This means that even though it seems to be solid at room temperature and can be shattered with a hard impact, it is actually fluid and will flow over time, but extremely slowly. The pitch drop experiment taking place at University of Queensland is a long-term experiment which demonstrates the flow of a piece of pitch over many years. For the experiment, pitch was put in a glass funnel and allowed to slowly drip out. Since the pitch was allowed to start dripping in 1930, only nine drops have fallen. It was calculated in the 1980s that the pitch in the experiment has a viscosity approximately 230 billion (2.3×1011) times that of water.[2] The eighth drop fell on 28 November 2000, and the ninth drop fell on 17 April 2014.[3] Another experiment was begun by a colleague of Nobel Prize winner Ernest Walton in the physics department of Trinity College in Ireland in 1944. Over the years, the pitch had produced several drops, but none had been recorded. On Thursday, July 11, 2013 scientists at Trinity College caught pitch dripping from a funnel on camera for the first time.[4] The viscoelastic properties of pitch make it the vehicle of choice for polishing high-quality optical lenses and mirrors. In use the pitch is formed into a lap or polishing surface, which is charged with iron oxide or cerium oxide. The surface to be polished is pressed into the pitch, then rubbed against the surface so formed. The ability of pitch to flow, albeit slowly, keeps it in constant uniform contact with the optical surface.

Production[edit] The heating (dry distilling) of wood causes tar and pitch to drip away from the wood and leave behind charcoal. Birchbark is used to make birch-tar, a particularly fine tar. The terms tar and pitch are often used interchangeably. However, pitch is considered more solid, while tar is more liquid. Traditionally, pitch that was used for waterproofing buckets, barrels and small boats was drawn from pine. It is used to make Cutler's resin.

See also[edit] Asphaltene Tar

References[edit] ^ COAL-TAR PITCH, HIGH TEMPERATURE ^ The Pitch Drop Experiment ^ Biever, Celeste; Lisa Grossman (17 April 2014). "Longest experiment sees pitch drop after 84-year wait". New Scientist. Retrieved 23 June 2014.  ^ "Trinity College experiment succeeds after 69 years". RTÉ News. 24 July 2013. Retrieved 23 June 2014. 

External links[edit] The Pitch Drop Experiment Pine Tar Production Primitive tar and charcoal production v t e Non-timber forest products Animal products Furs Honey Pine honey Wild game Berries Tree fruit Blackberry Blueberry Bilberry Breadfruit Cocoa bean Coconut Durian Gambooge Huckleberry Jackfruit Juniper berry Lingonberry Raspberry Tamarind Woodland strawberry Edible plants / roots Betel Fiddlehead ferns Mahuwa flowers Sago palm queen Sassafras filé powder root beer Saw palmetto Wild ginseng Mushrooms Bare-toothed russula Bay bolete Birch bolete Cep Chanterelle Honey mushroom Lingzhi Matsutake Meadow mushroom Morel Oyster mushroom Parasol mushroom Red cap Saffron milk cap Slippery jack Truffle Yellow knight Nuts Spices Allspice Areca nut Bay leaf Black pepper Brazil nut Cinnamon Clove Hazelnut Malva nut Nutmeg Pine nut Vanilla Oil Waxes Carnauba Chaulmoogra (Hydnocarpus wightiana) Cocoa butter Eucalyptol Eucalyptus Japan wax Kokum Kusum Mahuwa Nagkesar Palm (kernel) Pongamia Phulwara Pilu Sal-seed (Shorea robusta) Sandalwood Shea butter Tea-seed Tea-tree Vateria indica Resins Benzoin Birch tar Camphor Creosote Frankincense Gamboge Kauri Lacquer Mastic Myrrh Pine tar Pitch Rosin Turpentine Varnish Sap / Gum / etc. Birch syrup Chicle chewing gum Coconut sugar Date sugar Fruit syrup Gum arabic Gutta-percha Kino Latex Maple sugar Maple syrup Palm sugar Palm wine akpeteshie ogogoro Rubber Spruce gum Other Bamboo edible musical instruments textiles Birch bark Birch beer Cork Ferns Forage Gambier Moss Natural dyes henna Peat Quinine Rattan Shellac Tanbark tannin Thatching Tendu leaves Willow bark Related Dehesa (Iberian agroforestry) Forest farming / gardening Honey hunting Indian forest produce Mushroom hunting Naval stores Permaforestry Resin extraction Rubber tapping Wildcrafting Forestry portal Trees portal Category Commons WikiProject Forestry v t e Wood products Lumber/ timber Batten Beam Bressummer Cruck Flitch beam Flooring Joist Lath Molding Panelling Plank Plate Post Purlin Rafter Railroad ties Reclaimed Shingle Siding Sill Stud Timber truss Treenail Truss Utility pole Engineered wood Glued laminated timber veneer LVL parallel strand I-joist Fiberboard hardboard Masonite MDF Oriented strand board Oriented structural straw board Particle board Plywood Structural insulated panel Wood-plastic composite lumber Fuelwood Charcoal biochar Firelog Firewood Pellet fuel Wood fuel Fibers Cardboard Corrugated fiberboard Paper Paperboard Pulp Pulpwood Rayon Derivatives Birch-tar Cellulose nano Hemicellulose Cellulosic ethanol Dyes Lignin Liquid smoke Lye Methanol Pyroligneous acid Pine tar Pitch Sandalwood oil Tannin Wood gas By-products Barkdust Black liquor Ramial chipped wood Sawdust Tall oil Wood flour Wood wool Woodchips Historical Axe ties Clapboard Dugout canoe Potash Sawdust brandy Split-rail fence Tanbark Timber framing Wooden masts See also Biomass Certified wood Destructive distillation Dry distillation Engineered bamboo Forestry List of woods Mulch Non-timber forest products Papermaking Wood drying Wood preservation Wood processing Woodworking Forestry portal Trees portal Category Commons WikiProject Forestry Retrieved from "" Categories: MaterialsChemical mixturesAmorphous solidsNon-timber forest productsHidden categories: All articles with unsourced statementsArticles with unsourced statements from May 2017

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