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Cheap sandpaper was often passed off as glass paper; Stalker and Parker cautioned against it in A Treatise of Japaning and Varnishing published in 1688. [5] In 1921, 3M invented a sandpaper with silicon carbide grit and a waterproof adhesive and backing, known as Wet and dry. This allowed use with water, which would serve as a lubricant to ...
Does anyone have good details on 3M's original Wet & Dry? In particular a patent number for it. I'm finding some contradictions in just why it was waterproof. It seems that there were other abrasives around at this time that were already on waterproof backings (most metalworking emery cloth is, as it's a cloth backing not paper).
In 2008, 3M created the Renewable Energy Division within 3M's Industrial and Transportation Business to focus on Energy Generation and Energy Management. [ 87 ] [ 88 ] In late 2010, the state of Minnesota sued 3M for $5 billion in punitive damages, claiming they released PFCs —classified a toxic chemical by the EPA—into local waterways. [ 89 ]
To improve the wet strength it is common to use chemicals. The use of chemicals can retain as much as 10% to 30% of the original dry strength of the paper. [1] The wet strength chemicals may improve the dry strength of the paper as well. A Japanese research team found that the effect of humidity on cardboard differs depending on how it is ...
A fire truck and a police vehicle near an attack during New Year's celebrations, in New Orleans, January 1, 2025. - Octavio Jones/Reuters
One of the original pioneers of the wet abrasive process in late 1940s was Norman Ives Ashworth who found the advantages of using a wet process as a strong alternative to dry blasting. The process is available in all conventional formats including hand cabinets, walk-in booths, automated production machinery and total loss portable blasting units.
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