Congratulation to the Famous China Brand of Makall Silica Gel.The China Famous Brands Products & Worldwide Famous Brands Products commendation conference was hold in the Beijing Great Hall of the People on September 11,2007. the Makall brand silica gel was granted the honor of Famous China Brand. Since silica gel product has been listed firstly in Famous China brands products evaluation catalogue in 2007, Makall Brand Silica Gel is the only one to be granted the honor in China silica gel industry. Makall Group Inc. will take advantage of this opportunity to strenghen their quality management, to improve products quality and to build brand name strategy awareness with high quality production!
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Cobalt Indicating Silica Gel Health And Safety Update

Cobalt Indicating Silica Gel Health And Safety Update

 Cobalt Indicating Silica Gel Health And Safety Update
Standard indicating silica gel is often used within
microclimates to control Relative Humidity (see Conserve
 O Gram 1/8). Cobalt is present in small concentrations
(0.5 to 1.0% by weight) in indicating silica gel. As of
July 1, 2000, British Chemical Regulations have required
 that indicating silica gel be labeled and disposed of
as a hazardous material. While cobalt chloride has not
yet been listed on any U.S.-based hazardous materials
 registries, its change in status suggests that this
material should be treated with the same level of
protection as is required elsewhere. Health and Safety
Issues Cobalt is a skin and respiratory system sensitizer
. It is a European Economic Community (EEC) List II
substance for control of dangerous substances in the
aquatic environment and must not be allowed to contaminate
 soil and water. The cancer status varies on Material
Safety Data Sheet (MSDS) reports provided by manufacturers
 and suppliers from “no reports” to “Cobalt and its
compounds have been shown to cause cancer in laboratory
 animals.” The threshold limit value (TLV) is 0.01 mg/m3.
 Although the concentration of cobalt is small in
indicating silica gel, concerns revolve around the
possible contamination of silica gel dust with cobalt
 chloride. There also are hazards stemming from the
inhalation of silica dust. Small RH indicating cards and
 test papers that turn from blue to pink alsocontain
cobalt chloride. Since the danger is potential inhalation
 of cobalt dust, the use of these cards should not be a
 problem. However, if the card gets wet, there is the
possibility that the cobalt chloride could migrate and
recrystallize where it could conceivably become airborne.
 Disposal of Silica Gel All silica gel is listed as
“hazardous waste” by the EPA (Resource Conservation
Recovery Act) and must be disposed of appropriately.
Cobalt from indicating gel could pose a greater hazard
 than standard silica gel as cobalt can leach into
runoff or groundwater and poison aquatic life. Contact
 your park or regional HAZMAT coordinator to obtain
information on appropriate storage containers and disposal
 instructions. Alternative Materials Sorbead Orange
desiccant features a biodegradable, organic indicator
(available from Engelhard Chemicals). The amount of
indicator used in Sorbead Orange is five to ten times
lower than the amount of cobalt chloride found in cobalt
 chloride indicating desiccants. It changes from bright
orange to translucent in color when it has adsorbed
approximately 6% of water by weight. This desiccant can
be regenerated (returned to its original orange color
and adsorption capacity) by heating to a temperature of
 270-320ºF. Another choice, manufactured by Kaltron
Pettibone, is Silica Gel Yellow, an indicator gel with
phenolphthalein (0.01% by weight concentration). It is
distributed by Art Preservation Services. This indicator
 changes from yellow when dry to green, and finally to
deep blue when the gel has adsorbed 

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E-mail: makall@silica-gel.com.cn
Address: 28 Shuangyuan Lu., Liuting, Chengyang District, Qingdao, China.
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