ISO 24024-1:2021

Overview

ISO 24024-1:2021 defines a standardized designation system and basis for specifications for vinyl chloride thermoplastic resins (PVC). It applies to powdered homopolymer and copolymer resins of vinyl chloride where vinyl chloride is the main constituent. The standard establishes a concise, unambiguous way to identify resin type, polymerization process, intended application and key designatory properties - serving as the foundation for material specifications and supplier/ buyer communication.

Key topics and technical requirements

• Designation structure: A standardized pattern comprising an identity block and an individual-item block subdivided into five data blocks (1–5) that record polymer identity, fillers, intended application, designatory properties and optional additional requirements.
• Data block 1 (identity): Uses ISO 1043-1 symbols (e.g., PVC for homopolymer; VC/.../... for copolymers) and a single-letter code for polymerization process: S (suspension), E (emulsion), M (bulk), X (other/intermediate).
• Data block 3 (application): Code-letters for intended use - P (paste resins), F (filler resins), G (general-purpose resins).
• Data block 4 (designatory properties): Encodes measurable properties with standardized code numbers and ranges:
  • Reduced viscosity - 26 ranges, three-digit codes.
  • Apparent density - 12 ranges, two-digit codes.
  • Retention on a 63 µm sieve - eight ranges, two-digit codes.
  • Plasticizer absorption at room temperature - five ranges (for general-purpose and filler resins).
  • Paste resins - standard paste viscosity measured at shear rates of 16 s⁻¹ and 100 s⁻¹ (formulations A or B) and a rheological behaviour code: D (dilatant), N (Newtonian), P (pseudoplastic), X (unspecified).
• Limits: ISO 24024-1 provides designatory coding only; it does not supply engineering performance data or processing conditions. For test methods and property determination, refer to ISO 24024-2.

Practical applications

• Create unambiguous product designations for technical data sheets, procurement specifications and regulatory submissions.
• Facilitate communication between PVC resin manufacturers, compounders, converters and OEMs about expected polymer properties.
• Use as the basis for specifying resins for formulation, quality control acceptance criteria and inventory classification.
• Support traceability and reproducible processing by enabling additional requirements in data block 5 when tighter control is required.

Who should use this standard

• PVC resin producers and formulators
• Material engineers and product designers specifying vinyl chloride resins
• Quality assurance and procurement teams in plastics and building-materials industries
• Standards committees and testing laboratories coordinating material identification

Related standards

• ISO 24024-2 - Preparation of test samples and determination of properties (test methods referenced by ISO 24024-1)
• ISO 1043-1 - Symbols and abbreviated terms for basic polymers (used for identity codes)

Keywords: ISO 24024-1, vinyl chloride resins, PVC resins, designation system, reduced viscosity, apparent density, 63 µm sieve retention, plasticizer absorption, paste rheology, polymerization process.