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Sodium silicate solutions can also be used as a spin-on adhesive layer to bond glass to glass [21] or a silicon dioxide–covered silicon wafer to one another. [22] Sodium silicate glass-to-glass bonding has the advantage that it is a low-temperature bonding technique, as opposed to fusion bonding. [21]
The second edition was released in 1986, HMIS II, which introduced letter codes for identifying personal protective equipment to be used, and the 'asterisk' to the Health bar, to identify when a substance poses a long term health hazard, such as carcinogens. This would be placed in the same box as the health number. [3] [5] [6]
This label is made up of four colour-coded fields: red (flammability), blue (health hazard), yellow (chemical reactivity), and white (special hazard). The numbering ranges from 0 to 4 (for colours except white), with 0 meaning there is no potential hazard and 4 indicating the chemical is extremely hazardous.
H-phrases Health Hazards [5]; Code Phrase H300: Fatal if swallowed H300+H310: Fatal if swallowed or in contact with skin H300+H310+H330: Fatal if swallowed, in contact with skin or if inhaled
This deleterious chemical reaction causes the expansion of the altered aggregate by the formation of a soluble and viscous gel of sodium silicate (Na 2 SiO 3 · n H 2 O, also noted Na 2 H 2 SiO 4 · n H 2 O, or N-S-H (sodium silicate hydrate), depending on the adopted convention).
Sulfuric acid and sodium silicate solutions are added simultaneously with agitation to water. Precipitation is carried out under acidic or basic conditions. The choice of agitation , duration of precipitation, the addition rate of reactants, their temperature and concentration and pH can vary the properties of the resulting silica.
The Hierarchy of Occupational Exposure Limits, of which occupational exposure banding is a member. Occupational exposure banding, also known as hazard banding, is a process intended to quickly and accurately assign chemicals into specific categories (bands), each corresponding to a range of exposure concentrations designed to protect worker health.
n.o.s. = not otherwise specified meaning a collective entry to which substances, mixtures, solutions or articles may be assigned if a) they are not mentioned by name in 3.2 Dangerous Goods List AND b) they exhibit chemical, physical and/or dangerous properties corresponding to the Class, classification code, packing group and the name and description of the n.o.s. entry [2]