ASTM D6556 Determination of Total and External Surface Area of Carbon Black

    ASTM D6556 Introduction

    ASTM D6556 determines the external surface area of carbon black by the statistical thickness method (STSA) and the total area by multipoint nitrogen adsorption. Based on the B.E.T. theory, the NSA measurement includes the complete surface area, including micropores with pore widths less than 2 nm (20 Å). These calculations play a vital role in various industries, providing crucial insights for quality control and refining formulations. Well-known for its excellence in material testing, MaTestLab is one of the best testing service providers with the best network of laboratories in the US to carry out ASTM D6556 tests for our clients. This standard procedure helps in understanding surface characteristics, assisting product development, and enhancing performance.

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    ASTM D6556 Test Method

    The method proceeds as follows:

    Apparatus SetupA multipoint static-volume gas adsorption apparatus equipped with necessary accessories and Dewar flasks, along with sample cells, ensures sample isolation equivalent to a helium leak rate of <10-5 cm3/min. 
    Measurement of Surface AreaAt the liquid nitrogen temperature, the quantity of N2 absorbed by carbon black at various partial pressures of liquid nitrogen is measured. Using the adsorption data, the NSA and STSA values are computed.

    ASTM D6556 Equipment and Sample Preparation

    Specimen DetailsASTM D6556 test technique calculates the total and exterior surface area of carbon blacks based on multipoint nitrogen adsorption. The B.E.T. theory serves as the foundation for the N.S.A. measurement, which accounts for the total surface area, microspores, and pore diameters smaller than 2 nm.
    Specimen dimensionsThe specimen is taken as per the requirements of the method.
    Specimen PreparationThe carbon black sample preparation involves drying a portion at 125°C for 60 minutes, provided the moisture content is significant, conditioning an empty sample cell for 10 minutes, and weighing around 0.4 g of the carbon black into the sample cell. For degassing, either flow degassing is conducted at 300°C for at least 30 minutes or vacuum degassing is done until pressure is less than 1.4 Pa to ensure precise results.

    ASTM D6556 Results and Interpretation

    ASTM D6556 values are usually stated in square meters per gram (m2/g). This unit expresses the area of the carbon black surface per unit mass of the sample. The pore volume in the carbon black sample per unit mass is expressed in cubic meters per gram (m3/g). The test results help to ensure regulatory compliance in a variety of industries, optimize performance, support research and development initiatives, control costs, and maintain product quality.

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    ASTM D6556 is similar to other standard methods, such as ASTM D7633 and ASTM D1603, which are used for the determination of carbon content in carbon black and the calculation of carbon black content in olefin plastics, respectively.

    Use of ASTM D6556 in Various Industries

    This standard is widely used by various industries in the rubber manufacturing industry, coatings, and plastics, to evaluate surface area characteristics of carbon black and to enhance its reinforcement properties, aesthetics, and UV stability.

    Materials Commonly Tested with ASTM D6556

    This test is suitable for carbon black used as a performance additive, such as furnace black, thermal black, acetylene black, and other specialty carbon blacks. It meets the quality control requirements for applications in high-performance rubber and conductive plastics.

    Importance of ASTM D6556

    The standard gives information on the surface area of carbon black, which is a significant factor in its performance as a reinforcing agent, pigment, or conductive filler. Precise measurements allow manufacturers to predict and control material behavior, thus ensuring consistency, efficiency, and industry standards, contributing to product reliability and quality in sectors such as automotive, electronics, and coatings.

    FAQ

    Where can I get the astm d6556 tested?
    You can share your astm d6556 testing requirements with MaTestLab. MaTestLab has a vast network of material testing laboratories, spread across the USA and Canada. We support your all material testing needs ranging from specific astm d6556 test to various testing techniques.
    Please contact us for a detailed quote for your astm d6556 testing needs. Cost incurred to carry out different astm d6556 testing methodology depends on the type of raw material; number of samples, coupons, or specimens; test conditions, turn around time etc. Costs of some ASTM testing methods start from $100 and the final value depends upon the factors listed above. Please contact us for the best and latest prices.
    The required number of samples or specimens should comply with the procedure given in the astm d6556 standard. However, the MaTestLab operations team can assist you for your special requirements once you share your testing details with us.
    MaTestLab has a vast testing laboratory network, hence we bring you the best testing facilities in a cost-effective way. We offer considerable discounts (15-20%) to our returning customers based on test volume and frequency.
    The turnaround time for astm d6556 test methodology depends upon the test procedure mentioned in the standard test document. However, we at MaTestLab understand your research requirements and hence try to get your test completed within the least possible time.
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