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Plasticised PVC (Plastisol)
PVC was known for decades as a hard, brittle powder nobody could use. In 1926 Waldo Semon at B.F. Goodrich found that certain liquids dissolve it only when hot, and that the hot solution sets on cooling into a soft, rubber-like gel - flexible PVC.
**US 1,929,453**, "Synthetic rubber-like composition and method of making same", Semon, assigned to B.F. Goodrich, granted 10. October 1933, claims dissolving "an insoluble polymerized vinyl halide at an elevated temperature" in a liquid that dissolves it only well above room temperature, and gelling it by cooling. One example: 8 parts PVC, 8 parts tricresyl phosphate, 3 parts dibutyl phthalate.
**Plastisol is that idea in a bottle**: PVC grains suspended, undissolved, in plasticiser. Heat makes the liquid dissolve the grains and fuse into solid flexible PVC. You bake test films at three temperatures and pull them apart to find where it truly fuses.
初学者
2 hours
说明
1
1
Ventilate and set the oven
Ventilate and set the oven
Use a toaster oven kept for crafts, never food, by an open window. Put the probe thermometer inside - dial settings are rarely accurate.
所需工具：
台式烤箱
留置式探针温度计
N95 防颗粒物口罩2
2
Stir the plastisol
Stir the plastisol
The PVC grains settle. Stir the plastisol from the bottom for 2 minutes until even. Read the label's fusion temperature.
此步骤所需材料：
增塑溶胶150 毫升所需工具：
搅拌棒3
3
Spread three films
Spread three films
On the silicone mat, spread three 100 x 40 mm films about 1.5 mm thick with the palette knife.
此步骤所需材料：
增塑溶胶50 毫升所需工具：
硅胶烘焙垫
调色刀套装
钢直尺4
4
Bake at three temperatures
Bake at three temperatures
Bake one film 10 minutes each at 130 °C, 150 °C and the label's fusion temperature (commonly 160–180 °C). Never exceed the label maximum.
所需工具：
台式烤箱
红外测温仪
电焊手套5
5
Cool and cut strips
Cool and cut strips
Cool 10 minutes. Peel each film and cut a 10 mm strip from its centre. Mark its temperature.
所需工具：
美工刀钢直尺6
6
Stretch and pull
Stretch and pull
Clamp one end in the vise. Hook the spring scale to the other and pull slowly. Record the peak force and how it failed.
所需工具：
测力计（弹簧秤）
台虎钳
透明安全眼镜7
7
Recipe, cure curve, siblings
Recipe, cure curve, siblings
正在加载 Jupyter 笔记本…
8
8
History & Context
History & Context
**What the patent specifies:** gelling PVC in high-boiling liquids such as tricresyl phosphate and dibutyl phthalate. **Modern build (derived):** a commercial plastisol; many now use phthalate-free plasticisers.
Flexible PVC became cable insulation, shower curtains, hoses and flooring. Its limits: the plasticiser slowly migrates out, so old soft PVC stiffens and turns sticky; and overheated PVC yellows and releases hydrogen chloride, which is why the label's maximum temperature matters.
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