Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Forms of polyisoprene that are useful as natural rubbers are classified as elastomers. Currently, rubber is harvested mainly in the form of the latex from certain trees. The latex is a sticky, milky colloid drawn off by making incisions into the bark and collecting the fluid in vessels in a process called "tapping". The latex then is refined into rubber ready for commercial processing. Natural rubber is used extensively in many applications and products, either alone or in combination with other materials. In most of its useful forms, it has a large stretch ratio, high resilience, and is extremely waterproof.
The bottle scraper (known as both a flessenschraper (bottle scraper) and flessenlikker (bottle licker) in Dutch) is a Dutch kitchen tool similar to a small spatula. It is specifically designed to scrape the contents of long bottles that would be impossible to reach with other kitchen tools.
The scraper is made of a long shaft, frequently around 30 cm (1 ft) in length. On one side is a small flexible rubber spatula head roughly 4 cm (2 in) across set perpendicular to the shaft. The head is flexible and usually has a rounded half-circle shape one side useful for scraping round bottles and jars and a flat side with two right angles useful for scraping out cartons. The head is flexible so that it can be pushed into and pulled out of bottles whose mouth is smaller than the fully expanded head of the scraper but larger than the shaft.
A sweat scraper is a grooming tool used on horses. It consists of a handle and a rubber blade. It is used to remove sweat from horses. It is used in much the same manner as a window cleaner would scrape water or foam from a window with a rubber blade.
Sweat scrapers are available in both metal and plastic form. The typical use of a sweat scraper is now actually to remove excess water after bathing a horse to help it cool down rather than for just sweat. Without the use of a sweat scraper, it would take more effort and additional rags to remove the same amount of excess water therefore the proper use of a sweat scraper helps to ensure an effective cool down process.