CAS certified bamboo charcoal and bamboo vinegar CAS certified bamboo charcoal is made from mature bamboo over four years old, which is free from preservative, termite-proof chemical, glue, coating or other biochemical treatment. The well selected bamboo is subject to high temperature carbonization by conventional kiln or mechanical furnace with controlled procedure. The smog with temperature at 80℃-140℃collected from smoke discharge outlet during carbonization is cooled down and condensed into liquid which is left to sit for six months, during which the liquid separates into three layers. The upper layer of light-weighted oils and the lower layer of bamboo tar are discarded and the remaining middle layer of bamboo vinegar is distilled and then tested for safety and the qualified product can be entitled as CAS certified bamboo vinegar .
Requirements for CAS certified bamboo charcoal and bamboo vinegar
Since many factors may affect the quality of bamboo charcoal, therefore an array of check-up items will be thoroughly inspected and appraised during document review and on-site evaluation for the applicants of the CAS certification. Theses check-up items include environment of operation area, facility and hardware, raw materials, manufacturing process, quality, environmental hygiene and warehouse management. In addition, the labeling must carry important information such as index of refinement (electrical resistivity), fixed carbon content, BET value(specific surface area),hardness, species and origin of bamboo, manufacturing method, shape, net weight, user instruction and important notice, production date, manufacturer or vendor.
As the variation in carbonization temperature could result in change in the composition of the bamboo vinegar produced , the CAS regulation specifies that only the smog with temperature at 80℃-140℃ collected from smoke discharge outlet of carbonization furnace cab be used to yield bamboo vinegar. Depending on the manufacturing method, the bamboo vinegar can be classified as preliminary or distilled bamboo vinegar.
How to select good bamboo charcoal and bamboo vinegar？
(1) How to select good bamboo charcoal？
Good bamboo charcoal has undmaged and undeformed surfaces.Bamboo charcoal that has undergone high-temperature refinement has smooth surfaces, is structurally dense, makes sharp metallic sounds when knocked and has high electrical conductivity.
Different application requires different types of bamboo charcoal.Bamboo charcoal made at low temperatures (from 450–600°C) is suitable for agricultural applications, for example, as soil improvers or fertilizers. Bamboo charcoal made at medium temperatures (600–800°C) is appropriate for applications such as deodorizing and dehumidifying. Bamboo charcoal made at hig temperatures (from 800–1000°C) is suitable for health-related applications,such as far-infrared radiation emission and electromagnetic radiation shields.
(2) How to select good bamboo vinegar？
When bamboo undergoes high-temperature carbonization, many complicated chemical reactions (such as heat decomposition and re-combination reactions) occur, forming many structurally complex compounds. One such compound is tar, which is a carcinogen. Hence, the liquid must be refined to eradicate the tar. Other types of bamboo vinegar commercially available from the market are those that have not undergone such refinement. Refined bamboo vinegar has a slightly yellowish color and contains no suspended particles.
(3) The above criteria for picking out good bamboo
charcoal and bamboo vinegar are very simple. The best way to be sure of product quality is to purchase CAS（Certified Agricultural Standards） (i.e., certified by the Forestry Bureau of the Council of Agriculture) bamboo charcoal and bamboo vinegar, since the Forest Bureau of the Council of Agriculture conducts strict checks on the manufacturing process including the factory environment, the equipment used, raw material used, manufacturing processes adopted, quality, health related issues and storage matters. Additionally, the Bureau requires a CAS-certified product to carry relevant information including the grade, suggested applications, type and origin of bamboo, manufacturing process, usage directions, specific matters to be aware of and details of the manufacturer and seller on the product packaging.
Applications of good bamboo charcoal and bamboo vinegar
1. Bamboo charcoal has a dense structure with many pores, and hence has powerful absorption/attachment capability and can be used to regulate humidity level and to deodorize. Additionally, bamboo charcoal emits far-infrared radiation which is easily absorbed by the human body, improving blood circulation and general health . Bamboo charcoal is used in many everyday products , including washing agents, food additives, activated carbon and bamboo charcoal yarns.