![]() In the most basic of senses soft ones conform to impacts much like sponges, while hard covers act like a layer of hard armor plating on a vehicle or a metal insert in a bullet proof vest.Īlso have you ever worked in a lab environment? We use true pyrex, not the commercial brand stuff but higher grade levels made with borosilicate that is much more resilient to heat shock and not the standard commercial soda-lime variant. Screen protectors work on the function of a shield with two types, a soft or hard screen cover. Up here in Canada, during the winter there are flying pebbles everywhere cause of the road conditions and the fact that people throw down rocks for traction. How do you also think car windshields get scratches and chips in them? those are impact marks from high speed objects that cause micro fracture in the top glass layer. Dont trust me? Take a metal screw to your phones screen and slide it sharp tip down back and forth (If you value your phone, don't actually do this). Glass is hard yes, so most things don't scratch it, but glass can be scratched with metal. My old Nokia which didn't have one like 6 years ago had a nice huge scratch in the center of the screen form when it met my keys in my jacket pocket one night. Why do you think gold medal athletes bite their medals? It dates back as a proving mechanism that the medal was truly gold as it should be soft enough that your teeth leaves imprints.Īs for your phone analogy, the only reason why my phone isn't scratched is cause I have a soft screen protector on it which is designed to both absorbs impacts that would cause scratches and mitigates force over a larger area. Gold is soft so gets scratched easily, glass is hard, so it takes more force but can be scratched. Resistance is a quality determined by hardness, the harder the object, the more resistant. There is high RESISTANCE but not complete resistance. Polycarbonate isn't as strong as specialty glass, but it's cheaper and fails in a gentler way - stretching, deforming, and breaking instead of chipping or shattering.Īhh what are you talking about? There is no such thing as scratch resistant. That drives cost, so the high performance blender manufacturers use cheaper polycarbonate. The main issue with high speed blenders and glass jars is manufacturing cost, since they'd have to use specialty glass to ensure the interior of the jar didn't spall or chip. Most commercial glass has a strength of about 10,000 psi - but specialty glasses like Corning's Gorilla glass have strength that is much higher - above 30,000 psi (steel is typically 36,000 psi, for comparison). In Imperial units, that's about 4300 psi. That force is distributed over the impact zone of the coffee bean, which is about 25mm 2, so it's 28 megapascals of pressure. That's 600,000 g's, which sounds like a lot - except that the bean itself it only 0.12 grams, so it supplies a force of 720 Newtons during that time. A 240mph coffee bean is traveling about 120 m/s and, on impact with glass, stops in about 200 microseconds. Borosilicate is both heat resistant and food safe. Gorilla glass is a Corning variety that is designed for extreme toughness. The mods are somewhat flexible with the rules as long as the OP explains in the comments. Please remember to abide by Reddiquette.To make it easier for the community to help, also include your budget (if any) and what country you are buying in.Ħ please be descriptive with your posting, posts must include the products brand, years owned or date of purchase, circa the decade is acceptable on items older than 1990Ĩ /r/BuyItForLife is not a place to advertise your business or sell your product. Requests Must be flaired with the request flair and if you are satisfied with the answers please mark the post as such.Ģb be sure to first use the search bar and check the sidebar before making a request. Products that are well-made and durable (even if they won't last a lifetime) are accepted.Ģa Requests are posts where you are looking for help/recommendations on a certain type of a product or Opinions on a certain item. For practical, durable and quality made products that are made to last.ġ This is a subreddit emphasizing products that are Durable, Practical, Proven, and Made-to-Last.
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