what are VULCANIZED FIBER ?where use on ?
Vulcanized fiber is a pure, dense, cellulosic material with good electrical insulating properties and high mechanical strength. It is half the weight of aluminum, easily machined and formed, and is used for parts such as for barriers, abrasive-disk backing, high-strength bobbin heads, materials-handling equipment, railroad-track insulation, and athletic guards.
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Most manufacturers provide vulcanized fiber in the form of sheets, coils, tubes, and rods. Sheets are made in a thickness of 0.06 to 50.8 mm, approximately 1.2 x 2 m in size, or in rolls and coils from 0.06 to 2.3 mm thick. Tubes are made in the outside diameter range of 4.7 to 111.5 mm, and rods are produced 2.3 to 50.4 mm in diameter.
Sheets can be machined and formed to produce a variety of useful shapes for insulating or shielding purposes. Sheets, tubes, and rods can be machined using standard practices for cutting, punching, tapping, milling, shaping, sanding, etc.
Properties
Vulcanized fiber possesses a versatile combination of properties, making it a useful material for practically all fields. It has outstanding arc resistance, high structural strength per unit area, and can be formed and machined. In thin sections it possesses high tear strength, smoothness, and flexibility. In heavier thicknesses it resists repeated impact and has high tensile, flexural, and compressive strength.
The material is unaffected by normal solvents, gasoline, and oils, and therefore is recommended for applications where a structural support is required in the presence of these materials.
Moisture absorption is high and dimensional stability is affected by conditions of humidity when not protected by moisture-resistant coatings.
Vulcanized fiber is produced in 13 basic grades and numerous special grades to meet specific application requirements.
Applications
Vulcanized fiber serves as the insulating material in a signal block for railroad track insulations. At the end of a signal station, the rails are completely insulated from the next adjoining section to form what is termed a block. The two meeting rails and the coupling fixtures are insulated with formed parts made from vulcanized fiber. This junction is effective while absorbing the repeated impact from trains under all weather conditions.
Vulcanized fiber offers durability, ease of fabricating, excellent wear characteristics, and lightness of weight for materials-handling and luggage applications. The materials-handling equipment resists scuffing, battering, denting, rusting, and other general wearing conditions and provides protection by its hardness and resilience.
Formed pieces of vulcanized fiber offer outstanding service as arc barriers in circuit breakers. The arc-resistant properties of vulcanized fiber prevent a breakdown when the circuit breaker is subjected to an overload. The formed barrier is tested to take higher electrical loads than the maximum that can be produced by the circuit and, since repeated circuit breaks will not affect the performance of vulcanized fiber, the need for replacement is negligible.
Peerless control tape is used for programming data, processing equipment, or automatic machining equipment. The special properties that give this material outstanding service life are high tensile strength, high tear strength, low stretch, and good abrasive resistance.
Flame-resistant vulcanized fiber gives designers a structural material that can be used in those applications requiring a nonburning material and reduces fire hazards by containing a fire at its source. Flame-retardant parts serve as barriers in electrical equipment, materials-handling equipment, and wastebaskets.
Chemistry
Vulcanized fiber is produced by the chemical action of zinc chloride solution on a saturating grade of absorbent paper when processed under heat and pressure. The action of the zinc chloride converts the cellulosic fibers to a dense, homogeneous structure producing a laminated material that is refined to a chemically pure form. Final processing consists of drying to the proper moisture content and applying the proper calender to give smoothness and uniformity of thickness.
Grades
The 13 basic grades are as follows:
Electrical insulation grade. Primarily intended for electrical applications and others involving difficult bending or forming operations. It is sometimes referred to as "fish paper."
Commercial grade. Considered to be the general-purpose grade, sometimes referred to as "mechanical and electrical grade." It possesses good physical and electrical properties and fabricates well.
Bone grade. Characterized by greater hardness and stiffness associated with higher specific gravity. It machines smoother with less tendency to separate the plies in the machining operations.
Trunk and case grade. Conforms to the mechanical requirements of "commercial grade," but has better bending qualities and smoother surface.
Flexible grade. Made sufficiently soft by incorporating a plasticizer, it is suitable for gaskets, packings, and similar applications. It is not recommended for electrical use.
Abrasive grade. Designed as the supporting base for abrasive grit for both disk and drum sanders. It has exceptional tear resistance, ply adhesion, resilience, and toughness.
White tag grade. It has smooth clean surfaces and can be printed or written on without danger of ink feathering.
Bobbin grade. Used for the manufacture of textile bobbin heads. It punches well under proper conditions, but is firm enough to resist denting in use. It machines to a very smooth surface.
Railroad grade. Used as railroad track joint, switch rods, and other insulating applications for track circuits.
Hermetic grade. Used as electric-motor insulation in hermetically sealed refrigeration units. High purity and low methanol extractables are essential because it is immersed in the refrigerant.
White grade. Recommended for applications where whiteness and cleanliness are essential requirements.
Shuttle grade. Designed for gluing to wood shuttles to withstand the repeated pounding received in textile power looms.
Pattern grade. Made to provide maximum dimensional stability and minimum warpage for use as patterns in cutting cloth, leather, and similar materials
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www.allinsulating.com,
www.wellele.com , Vulcanized Fiber Manufacturers Suppliers Distributors Exporter ,email
:salefiber@yahoo.com,whatapp:+8615950042209 to get more msm and free samples.
Minimum Wall Thickness: .010" to 2.4"
size:Roll 48“， sheet:1000*1200,1200*1600
color:red ,black,grey, green,white
