grammarmedium
Not this
There are several caoutchoucs in the lab.
Use this
There is some caoutchouc in the lab.
Caoutchouc 是不可数名词，不能用复数形式。应使用 some 或 a quantity of 表示数量。
生橡胶；天然橡胶
先理解核心含义，再看它在真实句子里的用法。
生橡胶；天然橡胶
An elastic material obtained from the latex sap of trees, especially Hevea and Ficus, that can be vulcanized into various products.
The soles of these old boots are made of caoutchouc.
这双旧靴子的鞋底是用生橡胶做的。
橡胶
an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products
Workers collected caoutchouc from the rubber trees and shipped it to the factory.
工人们从橡胶树上采集生橡胶，然后运往工厂。
Because caoutchouc softens in heat, the lab stores it in a cool place.
由于生橡胶遇热会变软，实验室把它放在阴凉处。
Not this
There are several caoutchoucs in the lab.
Use this
There is some caoutchouc in the lab.
Caoutchouc 是不可数名词，不能用复数形式。应使用 some 或 a quantity of 表示数量。
Not this
This eraser is made of caoutchouc.
Use this
This eraser is made of rubber.
Caoutchouc 专指未加工的纯橡胶，日常用品如橡皮擦通常用加工后的橡胶制成，因此用 rubber 更自然。
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Dictionary facts from ECDICT, WIKTIONARY.