ASTM D7427 Standard Test Method for Immunological Measurement of Four Principal Allergenic Proteins in Hevea Natural Rubber and Its Products (Withdrawn 2023)

    ASTM D7427 Introduction

    ASTM D7427 has a protocol for detection by using immunological measures, especially ELISA, which is highly sensitive and specific. Products made using natural rubber latex may include allergenic proteins that are extremely harmful to patients who are sensitive to latex. Some of the clinically most significant allergens include Hev b 1, Hev b 3, Hev b 5, and Hev b 6.02. The procedure promoted regulatory conformity, product safety, and the creation of low-allergen latex products. Although the standard has been revoked, it was popular in other sectors like the manufacture of medical devices and the making of gloves, as well as in laboratories.

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    ASTM D7427 Test Method

    Sample PreparationExtract proteins from the latex product using a buffered solution under controlled temperature and pH conditions.
    Immunoassay SetupPrepare ELISA plates coated with antibodies specific to each allergen (Hev b 1, 3, 5, 6.02).
    Sample ApplicationAdd extracted protein samples and standards to the wells and incubate to allow antigen-antibody binding.
    DetectionIntroduce enzyme-labeled secondary antibodies, followed by a substrate that creates an average color change.
    QuantificationCompare the results against the calibration decrease to determine the permutation measurement absorption and allergen concentration using a spectrophotometer. 

    ASTM D7427 Equipment and Sample Preparation

    Specimen DetailsNatural rubber latex or latex-rich products, including gloves, balloons, and medical tubing.
    Specimen PreparationCuts products into small pieces, weighing accurately, and extracting them into a buffer solution. Elisa keeps pH and temperature according to kit requirements.
    Specimen DimensionsCuts products into small pieces, weighing accurately, and extracting them into a buffer solution. Elisa keeps pH and temperature according to the kit requirements.

    ASTM D7427 Results and Interpretation

    Concentration of allergens at low levels predicts that there is a low probability of causing allergies, whereas at a higher concentration, a new formulation of the product or an extra washing process may be necessary. The results are interpreted by laboratories against the industry thresholds, regulatory, and other expert information, and past batch records. The specificity of ELISA makes a valuable technique in the attachment of quality and certification of allergen detection since even low concentrations of allergens are also identified.

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    ASTM D6499 is used in immunological measurement of antigenic protein in natural rubber, and ASTM D5712 in protein analysis by the modified Lowry method.

    ASTM D7427 Applications in Industry 

    This was specifically applicable in the case of manufacturers of medical gloves, catheters, and other healthcare products, wherein the level of allergens needs to be well-regulated. It was also used in laboratories performing regulatory compliance assays, latex protein reduction research, and export market quality assurance. Balloon and condom manufacturers, among other non-medical industries, also employed the method to reduce the risk of allergens to both the consumers and the employees.

    ASTM D7427 Materials Commonly Tested

    Natural rubber latex films, medical examination gloves, surgical gloves, latex balloons, dental dams, and other dipped rubber products are some examples of materials that are traditionally tested according to this method.

    ASTM D7427 Common Challenges and Troubleshooting

    Difficulties with this method arise frequently in the event of failure to extract all the protein, or antibodies being cross-reactive, or a lack of correlation in the sensitivity of a particular ELISA kit. To overcome these, labs required piping of comparable protocols with regard to extraction, validated antibodies, and appropriate controls. Other environmental conditions (temperature and humidity of stored/tested samples) would be yet another cause of variation in outcomes.

    ASTM D7427 Safety and Best Practices

    Personal safety measures, such as the wearing of proper personal protective equipment, good ventilation, and disposing of biological reagents, are also part of laboratory safety. Availability of qualified, competent, and experienced staff is needed to calculate and maintain ELISA instruments.

    Importance of ASTM D7427 Test Method

    In demonstrating the role of this method in safeguarding citizen health, it made it possible to quantify major latex allergens accurately. Its use had contributed to low cases of allergies in medical and consumer goods manufacturing, and directed manufacturers in crafting safer manufacturing processes and ensuring conformity to the world safety standards. The protocol used in the study, after its withdrawal, continued to serve as a reference in identifying allergens and quality surveillance in the latex industry.

    Updated on September 17, 2026

    Davis Scott
    About Author
    Davis Scott is an Electrical and Electronics Engineer specializing in multidisciplinary validation, quality assurance, and comprehensive electro-mechanical testing.
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