Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US05/587,327 Inventor Nobuhiro Ishida Kazuyuki Saito Current Assignee (The listed assignees may be inaccurate.
LEAD PENCIL PDF
Google Patents Pencil lead and manufacturing method of the sameĭownload PDF Info Publication number US4017451A US4017451A US05/587,327 US58732775A US4017451A US 4017451 A US4017451 A US 4017451A US 58732775 A US58732775 A US 58732775A US 4017451 A US4017451 A US 4017451A Authority US United States Prior art keywords novolak pencil lead weight resin lead Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4017451A - Pencil lead and manufacturing method of the same (On a related note, you also cannot get ink poisoning from a pen.US4017451A - Pencil lead and manufacturing method of the same
Probably best just to use your pencil for writing. Of course, there would still be a hole in you from the stabbing, and swallowing bits of wood and other foreign material is a choking hazard, as well as a threat to your digestion. So, getting stabbed with a bit of pencil lead, or swallowing some, is not going to give you lead poisoning. But it was not until 1978 that the U.S banned lead in paint and nearly 15 years later in 1992 when the UK finally got around to banning it. Around the 1940’s a lot of manufacturers stopped adding lead to the paint that they were coating their products with. In the early days of pencil making the paint that they used to coat the wood with would have contained lead. If you would like to know more about wooden and mechanical pencils then take a look at Wooden Pencils Vs Mechanical Pencils. It is not actually lead but graphite the only difference been that it is not cased in wood and graphite is a nontoxic substance. The simple answer is no because the lead in a mechanical pencil is exactly the same as a wooden pencil lead. If this is severe then it is always worth going to see a doctor. but there should be no lasting harm done. at worst you may experience a mild stomach ache or possibly be sick. Where they discuss the problems you may encounter if you inadvertently swallowed a pencil.īasically, you are unlikely to experience any symptoms if you swallow pencil lead or are inadvertently stabbed by a pencil. The graphite used in pencils is more or less harmless, as the US National Institute of Health explains on their website. If you eat pencil graphite (pencil lead) You should be ok. If you are interested in learning more about this take a look at where does pencil lead come from?. Graphite is not a metal, but a mineral formed from carbon. So the next obvious question is graphite toxic? can you get graphite poisoning, fortunately, the answer again is no graphite is not toxic or poisonous, if it were all the pencil chewers would be in a spot of bother? Yes, it is called ‘pencil lead’ but it actually is graphite, a totally different substance from lead. You are perfectly safe and cannot die from pencil lead. Why not? Because there is no lead in a pencil. Is Pencil Lead Poisonous?/ Do Pencils have Lead?įor those who are wondering if pencil lead is poisonous or toxic and if they can get lead poisoning from a pencil? The answer is, ‘No.’ Not possible…not even from a whole box of pencils. 3 What happens if You Eat Pencil Graphite?ġ.
0 kommentar(er)
