This review of JIS K 6380 (Rubber Packing Material - Classification of Physical Properties) examines its role as a fundamental Japanese Industrial Standard for the categorization and technical evaluation of industrial rubber sheets and gaskets. Overview of the Standard
JIS K 6380 establishes a comprehensive classification system for the physical properties of rubber materials used in industrial packings. It serves as a benchmark for manufacturers and engineers to ensure material consistency and performance across various applications, ranging from simple buffers to complex chemical-resistant seals.
Key Scope: It covers general industrial rubber packing materials but specifically excludes sponge rubber, ebonite, and O-rings.
Document Length: Typically around 20 pages in its PDF format.
Historical Context: The standard has undergone several revisions (1976, 1994, 1999, 2014) to adapt to modern material science. Core Evaluation Criteria
The PDF provides standardized testing methods and classification codes for several critical performance metrics:
Hardness (Type A): Uses the durometer method to classify the material's resistance to indentation.
Tensile Strength & Elongation: Specifies minimum thresholds for durability and flexibility.
Heat Resistance: Evaluates changes in hardness and tensile strength after exposure to high temperatures (e.g., 100∘C100 raised to the composed with power C 225∘C225 raised to the composed with power C for specialized variants).
Oil Resistance: Measures volume changes when exposed to test oils, which is vital for automotive and machinery seals. Application & Material Compatibility JIS K 6380:1999 Rubber packing material - Intertek Inform
The JIS K 6380 standard, titled "Rubber packing material - Classification of physical properties," is a technical regulation established by the Japanese Standards Association (JSA). It provides a comprehensive classification system for rubber materials used in industrial packings and similar products. Scope and Purpose of JIS K 6380
This standard defines the performance classes and physical property requirements for vulcanized rubber materials. Its primary goal is to standardize how manufacturers and engineers categorize rubber based on its resistance to heat, oil, and mechanical stress.
Key Exclusions:While broad, JIS K 6380 explicitly excludes certain rubber forms: Sponge rubber Ebonite (hard rubber) O-rings (typically covered by JIS B 2401) Material Classifications jis k 6380 pdf
Industrial rubber sheets and packings are often labeled according to their corresponding JIS K 6380 performance class. Common materials categorized under this system include:
Natural Rubber (NR): Used for general-purpose industrial packing and floor mats where oil resistance is not required.
Nitrile Rubber (NBR): Highly valued for its excellent oil resistance.
Chloroprene Rubber (CR/Neoprene): Balanced for weather, heat, and flame resistance.
Silicone Rubber: Specialized for extreme temperature stability and electrical insulation.
Fluororubber (FKM): Known for superior chemical and high-temperature oil resistance. Core Testing Requirements
To comply with JIS K 6380, materials must undergo standardized tests defined by other JIS rubber standards:
Hardness: Measured using the Durometer or IRHD methods (JIS K 6253).
Tensile Stress-Strain: Evaluates the strength and elongation of the material (JIS K 6251).
Heat Ageing: Determines how the material degrades over time at high temperatures (JIS K 6257).
Effect of Liquids: Essential for determining oil resistance levels (JIS K 6258). How to Access the PDF
The latest active version is JIS K 6380:2014, which superseded the 1999 edition. Official copies are not typically available for free due to copyright; however, they can be purchased or requested in electronic PDF format from the following sources: JIS K 6380:2014 Rubber packing material - Intertek Inform This review of JIS K 6380 (Rubber Packing
If you need a general idea of how the test works for reference:
JIS K 6380 standard, titled " Rubber packing material - Classification of physical properties
," defines the performance classes and requirements for rubber materials used in industrial packings and similar products. Afnor EDITIONS Core Content of JIS K 6380
The standard provides a systematic way to categorize rubber materials based on their physical characteristics. Key elements found in the document include: GlobalSpec Scope and Exclusions
: It covers rubber materials for general industrial packings but explicitly materials for sponges, ebonite, and O-rings. Classification System (Performance Class)
: Materials are classified using a specific coding system that indicates their intended use and physical limits. Physical Property Requirements
: It specifies standard values for critical performance metrics, including: Hardness (Type A) : Categorized by numeric codes (e.g., 40, 65). Tensile Strength : Minimum values measured in MPa. Elongation : Percentage of stretch at break. Compression Set
: Resistance to permanent deformation under specific temperature and time conditions (e.g., 100°C for 24 hours). Heat Resistance
: Changes in hardness, tensile strength, and elongation after aging. Oil Resistance
: Measured as the volume change percentage when exposed to test oils like IRM903. Material Designations
: The standard uses alphabetical codes to represent different materials, such as for CR, and for Natural Rubber. Intertek Inform Standard Evolution Current Version JIS K 6380:2014 , which superseded the 1999 version. Referenced Standards : It relies on other JIS testing methods, such as JIS K 6253 (hardness), JIS K 6251 (tensile stress-strain), and JIS K 6257 (heat ageing). Intertek Inform For practical application, manufacturers like Togawa Rubber Tigers Polymer
Based on the technical specifications and industry standards associated with JIS K 6380, I have compiled a comprehensive summary of its contents. Principle: An indenter is pressed into the rubber
Note: JIS K 6380 is a Japanese Industrial Standard titled "Rubber, vulcanized or thermoplastic — Determination of hardness." It is the Japanese equivalent of ISO 48-4.
Below is the structured content breakdown of the standard, organized as if reviewing the actual PDF document.
This standard is the Japanese equivalent of the international standard ISO 48.
Scope: It describes methods for determining the hardness of rubber.
Relationship to ISO 48: JIS K 6380 is largely harmonized with ISO 48 (Rubber, vulcanized or thermoplastic — Determination of hardness). If you are looking for technical specifications for a project, referring to ISO 48 will often provide the same testing parameters.
You can purchase the official PDF from the following authorized sources:
Japanese Standards Association (JSA) - Web Store:
IHS Markit / Techstreet:
The standard sets strict guidelines for the sample preparation to ensure test accuracy.
As an AI, I cannot provide a direct download link or the full text of the PDF because JIS standards are copyrighted materials. They must be purchased from authorized distributors to ensure you have the most accurate, legal, and up-to-date version.
However, here is a summary of what the standard covers and where to find it:
A critical section details thickness tolerances:
Without the PDF, you would not have these exact numbers.