Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
ISO 28078-1:2009 PPS Moulding Materials — Designation System
Standardized designation and specification basis for poly(phenylene sulfide) plastics
ISO 28078-1:2009 establishes a standardized designation system for poly(phenylene sulfide) moulding and extrusion materials, providing a systematic method for identifying PPS grades based on their key material properties, filler content, and processing characteristics. This designation system enables material specifiers, manufacturers, processors, and end-users to communicate PPS material requirements accurately and consistently across the global supply chain, reducing specification errors and ensuring material consistency from different suppliers.
PPS is a high-performance engineering thermoplastic with outstanding chemical resistance to organic solvents and acids, exceptional dimensional stability, inherent flame retardancy (UL94 V-0 without additives), and continuous service temperature capability up to 220°C with short-term peaks to 260°C.
Designation System Structure and Data Block Coding
The ISO 28078-1 designation uses a multi-block structure. Block 1 identifies the base polymer as PPS. Block 2 specifies the filler or reinforcement type and content percentage using standardized code letters. Block 3 encodes key property ranges using alphanumeric codes for melt viscosity, tensile modulus, Charpy impact strength, thermal class, and flammability rating. Block 4 covers special requirements including color, UV stabilization, food contact approval, or other application-specific modifications.
| Designation Block | Coded Information | Example Code and Interpretation |
|---|---|---|
| Block 1: Material Identifier | Poly(phenylene sulfide) base polymer | PPS |
| Block 2: Filler/Reinforcement | Type and nominal content in percent by mass | GF30 = 30% glass fiber; CF15+TF5 = 15% carbon fiber + 5% PTFE; MD20 = 20% mineral filler |
| Block 3: Property Data | Melt viscosity, tensile modulus, impact, thermal class | MHR = high melt viscosity; 12-030 = tensile modulus 12000-14000 MPa; T220 = heat deflection temperature >220°C |
| Block 4: Special Requirements | Color, stabilizers, approvals | BK99008 = black color code; UV = UV stabilized; FC = food contact approved |
The designation system provides a useful shorthand for specifying common PPS grades, but it does not replace a full technical specification. Critical properties such as long-term heat aging, electrical tracking resistance, chemical resistance to specific media, and weld line strength should be verified against the manufacturer’s published technical data sheet.
Property Data Block: Detailed Coding Scheme
The third data block uses a systematic alphanumeric coding scheme. Melt viscosity is indicated by a single letter code: L (low), M (medium), H (high), or R (very high). Tensile modulus is coded as a two-number range representing the lower and upper bounds in MPa divided by 1000. Thermal performance uses T followed by the minimum heat deflection temperature in degrees Celsius. Impact strength codes use a letter for test method and number for minimum value. A complete designation example PPS-GF40-MHR-12-030-T220 identifies a 40% glass fiber reinforced PPS with very high melt viscosity, tensile modulus of 12000-14000 MPa, and heat deflection temperature exceeding 220°C.
The ISO 28078-1 designation system significantly simplifies PPS procurement specification. Engineers can specify a complete material grade in a single text line, eliminating ambiguity across different manufacturers’ trade names and grade numbering systems.
Basis for Creating Material Specifications
The standard also provides the framework for creating comprehensive material specifications including which properties to specify, recommended test methods referencing ISO 28078-2, typical property values for standard PPS grades, and sampling procedures. This framework ensures specifications are complete, consistent, and verifiable across different testing laboratories.
Q: Can the designation system accommodate new PPS formulations?
A: Yes, the system includes provisions for new filler types, property ranges, and special requirements through ISO’s formal registration process for new code assignments.
A: Yes, the system includes provisions for new filler types, property ranges, and special requirements through ISO’s formal registration process for new code assignments.
Q: How does the designation system handle colored PPS materials?
A: Color is specified in Block 4 using standard color codes from ISO 1043-4 or manufacturer-specific codes with appropriate prefix identifiers.
A: Color is specified in Block 4 using standard color codes from ISO 1043-4 or manufacturer-specific codes with appropriate prefix identifiers.
Practical Application in Material Selection and Procurement
The ISO 28078-1 designation system streamlines material selection for design engineers and procurement professionals. When specifying PPS for a new application, engineers can use the designation to communicate material requirements precisely without relying on brand names or proprietary grade numbers. For example, a specification reading PPS-GF40-MHR-12-030-T220 immediately identifies a 40% glass fiber reinforced grade with high melt viscosity, tensile modulus of 12000-14000 MPa, and heat deflection temperature exceeding 220°C, enabling procurement teams to source equivalent grades from multiple qualified suppliers.
For quality assurance, incoming material inspection can verify that delivered PPS grades match the designated specification through standardized testing per ISO 28078-2. This reduces the risk of material substitution errors and ensures consistent product quality. The standard also provides guidance on storage and handling conditions to maintain material properties before processing.
Q: Can the designation system differentiate between different PPS polymer grades (linear vs. branched)?
A: The current designation system focuses on compounded material properties rather than polymer architecture. However, differences in melt viscosity coding can indirectly indicate molecular weight differences between linear and branched grades.
A: The current designation system focuses on compounded material properties rather than polymer architecture. However, differences in melt viscosity coding can indirectly indicate molecular weight differences between linear and branched grades.
Q: How are recycled PPS materials designated?
A: The standard allows for recycled content designation through special requirement codes in Block 4, following the broader ISO 1043 series conventions for recycled plastics identification.
A: The standard allows for recycled content designation through special requirement codes in Block 4, following the broader ISO 1043 series conventions for recycled plastics identification.
Global Harmonization and Trade Facilitation
The ISO 28078-1 designation system facilitates international trade in PPS materials by providing a common language for material specification across different countries and languages. The standardized designation eliminates the need for manufacturers to maintain different grade naming systems for different regional markets and enables buyers to source equivalent grades from suppliers worldwide with confidence. This harmonization reduces specification errors, simplifies material qualification processes, and supports global supply chain efficiency for PPS products.
Role in Global Plastics Supply Chain
ISO 28078-1 serves an important role in the global plastics supply chain by providing a standardized material identification system that transcends manufacturer trade names and national specification systems. This enables global sourcing of PPS materials, facilitates material substitution when primary suppliers face disruptions, supports regulatory compliance through clear material identification, and simplifies documentation for customs and material safety data sheet requirements. The standard is maintained by ISO/TC 61 (Plastics) and is regularly reviewed to ensure it remains current with industry developments.
