Suggestions for Compounding Colored Rubber Compound to conserve color cost. The color is usually the most expensive ingredient in a compound. It is often sensitive to curing conditions and to other compounding ingredients. Anything which tends to change the shade of the base compound will affect the color . The hexadecimal RGB code of Raw Umber color is # and the decimal is rgb(,,68). The red-green-blue components are 82 () red, 66 () green and 44 (68) blue.
Rubber is made black by adding various chemicals, such as carbon black. For instance, with tires, carbon black works as a reinforcing filler in rubber, which increases the durability and strength of the end product. Adding carbon black also helps conduct heat away from certain hot spots on the tire; specifically, in the tread and belt whxt, which can get particularly hot at times while driving.
This reduces thermal damage to the tire, which further extends its lifespan. Ruhber began selling their carbon black to the Goodrich Tire Company, which is when white tires started disappearing on cars gaw favor of the much superior black tires.
Carbon black itself is simply nearly collor elemental carbon in colloidal particle form. It is classically made by charring any organic material. Dave: Sources?
Seems pretty white to me. Your email address will not be published. Save my name, email, and website in this browser for the next time I comment.
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The raw material is typically yellow, although it can also be orange or red tinted, depending on the manufacturer. Its elongation at break is ? % and possesses a tensile strength of ? . will provide the bright colors, but careful selection must be used for outdoor durability. To put it very briefly, outdoor durable blues, greens, white and off-white, tans and browns can be made with standard rubber colors while most other colors will require “high performance”. Jul 28, · Originally rubber tires were white, which is the natural color of rubber. In the early s, Binney & Smith began selling their carbon black chemicals to Goodrich Tire Company, as it was found that the use of carbon black in rubber manufacturing significantly increased certain desirable qualities for rubber meant to be turned into tires.
As an elastomer , rubber is characterized by its ability to be temporarily deformed, often under a great degree of tensile stress, and return to its original state with little or no permanent degradation. Non-vulcanized rubbers have molecular chains that are not cross-bonded, lending them a high amount of plasticity and the capacity for forming through heat treatments.
On the other hand, vulcanized rubbers remain in their fully elastic state, precluding thermal forming methods, but with greater weathering, oxidation, and wear resistance, as well as tensile strength.
Since both rubber and vulcanized rubber are greatly affected by conditions such as temperature range, presence of corrosive elements, and material stability, numerous considerations must be taken into account when coloring these materials. The pigments used for coloring rubber should not contain any substances that might degrade the material characteristics or inhibit the vulcanization of the rubber. Certain metals, such as manganese or copper, if introduced in even trace amounts, can greatly destabilize a rubber compound by causing accelerated aging.
Rubber coloring pigments, therefore, are restricted to a 0. However, some pigments, such as copper phthalocyanine, can have slightly higher amounts of incompatible metals, but usually no more than 0.
Manufacturers frequently test pigments for the presence of these antagonistic substances. Aesthetic qualities, such as the uniformity and fastness of the alteration, are important considerations when coloring any material.
In the case of rubber, drift resistance is one of the central criteria in choosing an appropriate pigment. Many manufacturers use a migration test to determine if a given pigment will cause colors to run, fade, or bleed into other surfaces. This test employs a range of different pigment concentrations, each of which is applied to a standard white rubber sheet.
The pigmented sheet is then quickly vulcanized under a hot steam exposure process, usually for no longer than half an hour. Engineers place cotton fabric against the colored rubber to ascertain if color has bled into the fabric or into the rubber.
Since rubber is influenced by temperature changes, the pigmentation of a rubber product must be able to withstand certain heat ranges or react to thermal treatments in a particular way. Like migration tests, heat resistance tests involve multiple pigment concentrations being tested simultaneously.
These concentrations usually contain between 0. After the pigments are applied, the newly colored rubber sheets undergo a hot vulcanization process that can reach nearly degrees Fahrenheit. The results are then compared to an uncolored white rubber sheet that goes through an identical heating procedure. If the pigmentation cracks, fades, bleeds, or in any way degrades the material quality of the rubber base, that concentration is deemed unsuitable for coloring purposes.
Industrial coloring methods are categorized by the International Organization of Standardization, which provides standards for manufacturing most kinds of pigments and dyes. This organization also delineates the chemical and physical properties of various pigments, as well as the techniques for testing coloring materials.
Many coloring manufacturers also employ the Color Index International as the standard authority on naming specific colors and identifying their characteristics on the color spectrum. Rubber coloring pigments are typically applied in powdered or granulated form. Some examples of the most commonly used types of coloring agents in rubber fabrication include:. These coloring agents are a small portion of the wide array of pigments and dyes available in rubber production. The Color Index International lists nearly 30, different coloring products, including many used by rubber manufacturers.
But despite the extensive variety of rubber coloring agents, nearly all of them are judged on their material stability, resistances, potential for color migration, and reactions to different temperature ranges. Enlist Your Company ico-arrow-default-right. Guides Share:. Select From Over , Industrial Suppliers.