ASTM D1562-22 PDF

Overview

ASTM D1562-22 is the internationally recognized standard classification system and basis for specification for cellulose acetate propionate (CAP) molding and extrusion compounds. Developed by ASTM, this standard covers plasticized cellulose acetate propionate thermoplastic compounds, which are suitable for injection molding and extrusion processes. CAP materials are notable for their reprocessability and recyclability, as they remain thermoplastic after processing. The standard defines composition requirements, classification by property groups and grades, and offers guidance for the specification and identification of CAP materials used in molded and extruded products.

Key Topics

• Classification System: Provides a framework to identify CAP materials, distinguishing by group (impact or tensile strength), class (plasticizer range), and grade (intended processing method - injection molding or extrusion).
• Material Requirements: Specifies composition limits, including propionyl content less than 48% and acetyl content less than 3%. Allows the inclusion of dyes and pigments as long as specified properties are met.
• Physical and Electrical Properties: Includes requirements for properties such as:
  • Specific gravity
  • Tensile stress at yield
  • Flexural modulus
  • Izod impact strength
  • Water absorption
  • Weight loss on heating
  • Volume resistivity and dielectric strength (for electrical applications)
• Test Methods: Standardizes specimen preparation and conditioning procedures, referencing established ASTM methods for property testing (e.g., D638 for tensile, D790 for flexural, D257 for resistivity).
• Suffixes and Additional Requirements: Enables the specification of additional or specialized material characteristics through an organized system of suffixes, referencing ASTM D4000 where appropriate.
• Quality Assurance: Details on sampling, inspection, and certification for supply conformity, including lot acceptance, periodic checks, and reporting requirements.

Applications

CAP molding and extrusion compounds, as classified by ASTM D1562-22, are widely used for their balanced physical and processing properties. Typical practical applications include:

• Consumer Goods: Parts requiring transparency, color control, or good impact strength, such as tool handles, brush backs, eyewear frames, and small molded items.
• Automotive Components: Decorative trims, bezels, and transparent or colored parts where durability and chemical resistance are valued.
• Electrical Components: Uses as insulating materials benefiting from defined dielectric properties, such as housings and electrical enclosures.
• Packaging: Film, sheet, and blister packaging that leverages CAP’s processability and clarity.
• Industrial Uses: Applications where reprocessability and recycling are valued, aligning with sustainable manufacturing practices.

Related Standards

ASTM D1562-22 references several related ASTM standards that support the testing, classification, and processing of plastics, including but not limited to:

• ASTM D4000 - Classification System for Specifying Plastic Materials
• ASTM D638 - Test Method for Tensile Properties of Plastics
• ASTM D790 - Test Methods for Flexural Properties of Plastics
• ASTM D256 - Test Methods for Impact Resistance
• ASTM D257 - Test Methods for DC Resistance or Conductance of Insulating Materials
• ASTM D1003 - Test Method for Haze and Luminous Transmittance of Transparent Plastics

These standards help ensure that CAP compounds meet stringent quality and performance requirements for their intended applications.

Keywords: ASTM D1562-22, cellulose acetate propionate, CAP, molding compounds, extrusion compounds, plastics classification, thermoplastic materials, injection molding, material specification, recycled plastics, plastics testing.