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Sandpaper from Sand, Hide Glue and Paper
A coated abrasive is grit glued to a backing. The first recorded one, in 13th-century China, bonded crushed shells, seeds and sand to parchment with natural gum. Here clean quartz sand is crushed, sieved into grades and scattered on paper brushed with warm hide glue.
Sieve mesh only roughly matches a shop grit number: real P grades are set by ISO 6344. Quartz grit on hide glue wears faster than garnet or aluminium oxide paper, and water softens the glue, so use it dry.
初学者
1 hour, plus a day drying
说明
1
1
Crush the sand
Crush the sand
With a dust mask on, crush clean quartz sand in the mortar, a few spoonfuls at a time.
此步骤所需材料：
石英砂300 克所需工具：
研钵与研杵
防尘口罩2
2
Sieve into grades
Sieve into grades
Sieve through the 60, 80 and 120 mesh sieves stacked coarse on top. Keep what each sieve holds in its own labelled jar: coarse, medium and fine.
所需工具：
60 目筛
80 目筛
120 目筛
带盖玻璃罐防尘口罩3
3
Warm the glue
Warm the glue
Soak hide glue granules in water, then warm them in a double boiler to about 60 °C until runny. Do not let it boil.
此步骤所需材料：
兽皮胶50 克
水0.1 升所需工具：
双层隔水锅
电热板
留置式探针温度计4
4
Glue the paper
Glue the paper
Brush a thin, even coat of glue over one face of a sheet of strong paper, edge to edge.
此步骤所需材料：
纸3 张所需工具：
涂胶刷5
5
Scatter the grit
Scatter the grit
While the glue is wet, sprinkle one grade of grit thickly over it, press it in with a rolling pin over a clean sheet, and let it set for a minute.
所需工具：
擀面杖6
6
Shake off and dry
Shake off and dry
Tip the sheet on edge and tap off the loose grit back into its jar. Dry it flat for a day, then label the back with its grade.
所需工具：
带盖玻璃罐7
7
Test it
Test it
Sand a scrap of softwood ten strokes and look at the scratches. Cut sheets to size.
所需工具：
剪刀8
8
Troubleshooting
Troubleshooting
Home-made sandpaper troubleshooting.
Flow
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