The standard specifically targets vulcanized and thermoplastic rubber compounds engineered for structural sealing, gaskets, and industrial protective sheeting.
High-performance chemical and high-temperature resistance.
Severe oil resistance (low volume swell, typical of Nitrile or Fluoroelastomers). 3. Hardness and Tensile Strength
Specifies standard reference oils (like IRM 901 and IRM 903) and immersion times to calculate the volume swell percentage of oil-resistant sheets. JIS K 6380 vs. ASTM D2000 jis k 6380 pdf
The first number following the letters represents the nominal hardness measured on the Durometer Type A scale. = 50 ± 5 Shore A (Soft, highly compressible) 6 = 60 ± 5 Shore A (Standard gasket hardness) 7 = 70 ± 5 Shore A (Firm, good pressure resistance) 8 = 80 ± 5 Shore A (Hard, high extrusion resistance) 4. Tensile Strength (Second Digit)
Rubbers designed for ozone, outdoor, or specialized chemical exposure, such as Chloroprene (CR/Neoprene) or EPDM. 2. Hardness (Durometer)
: Materials are often tested and coded for specific high-performance features: : Heat aging resistance test. : Compression set resistance test. : Oil resistance test. : Ozone resistance test. : Electrical insulation test. : Low temperature test. Constructional Specifications ASTM D2000 The first number following the letters
60 Shore A hardness, 5.0 MPa tensile strength, 300% elongation.
Following the hardness designation, the code specifies the minimum tensile strength (measured in MPa or kgf/cm²) and the minimum elongation at break (expressed as a percentage). This ensures the rubber sheet can withstand physical stretching and mechanical stress without tearing. 4. Suffix Requirements (Environmental Testing)
: Materials are typically categorized by their resistance to various environmental factors: Oil Resistance : Often tested using oils like [5.1, 5.11]. Temperature Resistance 5.0 MPa tensile strength
Evaluation of how the rubber performs when exposed to alkalis, alcohols, amines, or outdoor weathering. Common Materials Used
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Determined using a continuous 72-hour accelerated heat aging test outlined in . The assigned letter establishes the upper test temperature ceiling that a material can withstand while preserving its baseline structural integrity: Standard JIS K 6380 - Afnor EDITIONS
These are just a few examples. The standard covers many more material grades, each tailored to specific combinations of properties. The full list of classifications is detailed in the complete JIS K 6380 document.
Utilizing a Type A durometer to ensure the sheet meets the specified stiffness.