T/WFSB 08-2021 Active Group standards

T/WFSB 08-2021, the Four Treasures of the Study: An Inkstone for Students

T/WFSB 08-2021

Publish Date: 2022-06-01 Implement Date: 2022-06-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/WFSB 08-2021

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Art and crafts

Publish Date: 2022-06-01

Implement Date: 2022-06-01

Scope

Main technical content: The main technical content includes the classification, performance requirements, and safety requirements of student inkstones. Among them, the classification is divided into stone inkstones and synthetic inkstones, and synthetic inkstones are further divided into synthetic inkstones containing natural materials and synthetic inkstones not containing natural materials. The performance requirements of stone inkstones and synthetic inkstones containing natural materials include three items: hardness, ink absorption, and water absorption; the performance requirements of synthetic inkstones not containing natural materials include two items: density and drop resistance. The safety requirements of stone inkstones and synthetic inkstones containing natural materials include the limit of natural radionuclides; and the safety requirements of all synthetic inkstones include three items: migratable elements, phthalates, and free formaldehyde