JIS K 6268 specifies test methods for determining the density of vulcanized rubber. Density results are widely used for incoming material checks, compound and product QA/QC, and production calculations where mass must be tied to a required rubber volume.
If you need help aligning your internal procedure, report format, or instrumentation setup to the exact cited edition of JIS K 6268, talk with our team.
JIS K 6268:1998 — Rubber, vulcanized — Determination of density
JIS K 6268 is a JIS (Japanese Industrial Standard) that defines two test methods for measuring the density of vulcanized rubber. In practical terms, it supports material identification, compound control, and verification tasks where density is used as a measurable property tied to formulation and finished-part consistency.
This standard is published by the Japanese Standards Association (JSA) and remains cited across rubber product documentation where density (or specific gravity) is a required declared property.
Quick Definition
JIS K 6268 is a density-determination standard for vulcanized rubber, providing two alternative test approaches and defining how density is established for test specimens.
What This Standard Covers
JIS K 6268 covers the measurement of vulcanized rubber density using two specified methods. The intent is to provide a consistent way to obtain density values that can be used for quality control and for mass calculations when manufacturing a required volume of vulcanized rubber.
Because density methods can differ by specimen form and measurement approach, the exact method selection and reporting expectations should be taken from the official standard document referenced in your contract, drawing, or internal test plan.
Why This Standard Matters in Testing
Density is a simple but high-value check in rubber production and verification. It is commonly used to:
- monitor compound consistency (batch-to-batch changes can show up as density shifts),
- support material identification and comparison activities, and
- convert between mass and volume for production planning and part design targets.
For laboratories, a clear density method reduces disputes about how values were generated, especially when results are used as an acceptance criterion or appear on certificates of analysis (COAs) and inspection reports.
Common Materials, Product Types, or Applications Covered
This standard is used for vulcanized rubber materials and rubber components where density (or specific gravity) is specified, tracked, or reported. Typical users include rubber compounders, molded rubber part manufacturers, and QA/QC teams managing rubber materials used in industrial products.
Density testing is often paired with other physical-property checks (for example, hardness, tensile properties, abrasion, or liquid effects) to build a more complete picture of compound and process stability.
Common Test or Verification Workflow
JIS K 6268 is typically applied as a short, repeatable measurement within a broader rubber quality workflow.
Common workflow: Select a representative cured (vulcanized) rubber specimen, perform density measurement using one of the methods permitted by the standard, calculate density in the required units, and record method choice and key test conditions in the report so the result can be reproduced.
Practical note: Density values can be sensitive to trapped air, surface condition, and specimen integrity. Consistent specimen preparation and handling practices are important for repeatability, especially when the result is used for acceptance or trending.
Equipment Commonly Used for This Standard
JIS K 6268 does not point to a single mandatory instrument model, but it does imply a measurement setup capable of accurately determining density using the chosen method.
Common equipment: Precision balance (laboratory scale), a density determination accessory/kit appropriate to the method (for example, fixtures that support buoyancy-based measurements), and supporting items to control or record relevant test conditions (such as temperature) when required by the method.
When selecting equipment, the most common purchasing questions are measurement resolution, repeatability across operators, fixture compatibility with specimen size/shape, and the level of control needed for the test environment.
How to Read This Designation or Revision
Designation format: JIS K 6268:1998.
What the year means: The “1998” is the publication year for the cited edition. JIS documents can also be “confirmed” without changing the technical content; in that case, the year in the designation stays the same even though the confirmation date is newer.
Revision sensitivity: Density method details, calculation specifics, and reporting expectations can vary by edition or by the way a customer cites the standard. For procurement, always match the edition explicitly referenced on the drawing, purchase order, or customer specification.
Related Standards, Methods, or Frameworks
JIS K 6268 is technically aligned with the corresponding ISO standard for vulcanized rubber density determination.
Common related reference: ISO 2781 (Rubber, vulcanized — Determination of density).
Get help quoting a JIS K 6268 density test setup
If you are selecting a balance, density fixture/accessory, or a lab configuration to support JIS K 6268 measurements, you can request a detailed quote based on your specimen geometry, throughput, and reporting needs.
