Zinc Oxide

Zinc oxide

ORIGIN : INDIA

PACKAGING : 25 KG BAG

INTRODUCTION :
The rubber industry, in its development over the past one hundred years, has utilized an increasing number of the many optical, physical and chemical properties of Zinc Oxide. Zinc Oxide proved the most effective activator to speed up the rate of cure with the new accelerators. Heavy-duty pneumatic tires carry high loadings of Zinc Oxide for heat conductivity as well as reinforcement since heat-buildup is critical at their higher operating speeds compared with their solid-rubber counterparts.

ACTIVATION :
In the curing process for natural rubber and most types of synthetic rubbers, the chemical reactivity of Zinc Oxide is utilized to activate the organic accelerator. Adequate levels of Zinc Oxide contribute markedly to chemical reinforcement, scorch control, and resistance to heat-aging and compression fatigue.

HEAT STABILIZATION
Zinc Oxide similarly retards devulcanization of many types of rubber compounds operating at elevated temperatures.

LATEX GELATION
In the production of latex foam rubber products, Zinc Oxide is particularly effective in gelation of the foam with sufficient stability.

PIGMENTATION
Through its high brightness, refractive index, and optimum particle size, Zinc Oxide provides a high degree of whiteness and tinting strength for such rubber products as tire sidewalls, sheeting and surgical gloves.

REINFORCEMENT
Zinc Oxide provides reinforcement in natural rubber, and in some synthetic elastomers such as polysulfides and chloroprenes. The degree of reinforcement appears to depend upon a combination of the particle size of the oxide, the finest size being the most effective, and the reactivity of the oxide with the rubber. Under such service condition involving rapid flexing or compression, Zinc Oxide also provides heat conduction to more rapidly dissipate the heat and thereby provides lower operating temperatures. In addition, it imparts heat stabilization by reacting with acidic decomposition products.

RUBBER - METAL BONDING
In the bonding of rubber to brass, Zinc Oxide reacts with copper oxide on the brass surface to form a tightly adhering Zinc-copper salt.

PAINTS
Zinc Oxide in organic coatings provides a broad spectrum of properties: optical, chemical, biochemical and physical. Over the past century the paint industry, in its constant development of improved products, has utilized various aspects of those properties to high degree. Manufacturers discovered that they could produce coatings of brushing consistency and good suspension properties by incorporation of Zinc Oxide into their pastes. Painters noted that they furnished better hiding power,whiteness, cleaner tints, tint retention, and durability as well as non-darkening in the presence of sulfur fumes.

French-process Zinc Oxide has been proved superior to American-process type in fungus resistance and less sulfide staining.

METAL – PROTECTIVE COATINGS
Zinc metal powder (zinc dust) and zinc compounds have long been utilized for their anticorrosive properties in metal-protective coatings, and today they are the basis of such important specially metal primers as Zinc Chromate primers. Zinc dust-Zinc Oxide paints are especially useful as primers for new or weathered galvanised Iron. Such surfaces are difficult to protect because their reactivity with organic coatings leads to brittleness and lack of adhesion. Zinc dust-Zinc Oxide paints however, retain their flexibility and adherence on such surfaces for many years. Zinc dust-Zinc Oxide paints also provide excellent protection to steel structures under normal atmospheric conditions, as well as to steel surfaces in such under-water conditions as dam faces and the interior of fresh water tanks.

SILICATE COMPOSITIONS
Zinc Oxide reacts with aqueous solutions of Silicates, such as Sodium Silicate solutions (commonly known as water glass) to form Zinc Silicate, a waterproof, fireproof refractory material, which is useful as a binder in paints. Such refractory adhesives are used in bonding Asbestos-cement molded products to building structures.

PHARMACEUTICAL INDUSTRY
Zinc Oxide is mainly used in Zinc soap, ointment, dental inlays, food powders etc. Zinc Oxide forms an indispensable element of the production process of this industry.

COSMETICS
The optical and biochemical properties of Zinc Oxide and its derivatives impart special features to a variety of cosmetic preparations for care of the hair and skin. In powders and creams it protects the skin by absorbing the ultraviolet sunburn rays; in burn ointments it aids healing. Simple salts of Zinc provide astringent and skin-conditioning properties to creams, while more complex salts furnish fungistatic properties which contribute to the effectiveness of deodorants, soaps, and anti-dandruff preparations.

ADHESIVES, MASTICS, SEALANTS
Zinc Oxide has long been a major constituent of surgical and industrial tapes based on natural or synthetic rubber as it is outstanding in retention of tack during shelf–aging. Neoprene adhesives are improved by the addition of both Phenolic resins and Zinc compounds (including Zinc Oxide), the reaction products imparting special properties such as high heat resistance, high bond strength, improved peel and shear – stress resistance, and stability to settling of Neoprene solution adhesives.

PLASTICS
Zinc compounds can provide a variety of properties in the plastics field. Heat resistance and mechanicalstrength are imparted to acrylic composites by Zinc Oxide. Zinc Oxide contributes to the formation and cure of epoxide resin. Addition of Zinc Oxide to epoxy resins cured with aliphatic polyamines imparts higher tensile strength and water resistance. Zinc Oxide imparts fire-resistant properties to nylon fibers and moldings. Zinc Oxide is also useful in the preparation of nylon polymers and in increasing their resistance. The formation of polyesters in the presence of Zinc Oxide imparts higher viscosity and other improvements. ZnO reacts with unsaturated polyesters to form higher viscosity and a thixotropic body. The dyeability of polyester fibers is improved by Zinc Oxide. Zinc Oxide mixtures stabilize polyethylene against aging and ultraviolet radiation. Zinc Oxide increases the transparency of poly(chlorofluoroethylene) molding resin. Polyolefin's are improved in color, tensile strength, and vulcanization properties by addition of Zinc Oxide. Thermal stabilization of PVC is effected by Zinc Oxide. Antistatic, fungistatic and emulsion stability are additional properties imparted to vinyl polymers by Zinc Oxide. Applications in development for Zinc Oxide-stabilized polypropylene and high-density polyethylene include safety helmets, stadium seating, insulation, pallets, bags, fiber and filament, agricultural and recreational equipment.

Sr No.	Parameters	Unit	Test Method	Specification
				Min.	Max.
1	Zinc As Zn0 (as such)	%	Titration	99.6	-
2	Particle Size	u	N/A	0.2	0.3
3	Lead as Pb0	ppm	AAS	-	20
4	Moisture Content	%	N/A	-	0.2
5	Loss On Ignition	%	N/A	-	0.3
6	Nitrogen Surface Area	M2/gms	BET	4	6
7	Water soluble salts	%	N/A	-	0.1
8	Iron	ppm	AAS	-	10
9	Acid Insoluble	%	N/A	-	0.1
10	Asieve residue on 325 mesh	&	N/A	-	0.3

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