This specification covers materials made from only virgin ABS polymers and blends of ABS polymers suitable for use in the extrusion of pipe and molding of fittings. ABS polymers and blends of ABS polymers shall be classified according to cell limits: Cell 0; Cell 1; Cell 2; Cell 3; Cell 4; and Cell 5. The ABS material shall be produced by polymerization of the monomers, acrylonitrile, butadiene, and styrene, or their closely related chemical derivatives, or from a blend of ABS polymers from those monomers. The blend of ABS polymers can be intimately mixed by melt compounding, or it can be a homogeneous physical mixture of discrete ABS polymers. Materials shall be measured using techniques in accordance with the following test methods: impact testing; deflection temperature under load; tensile stress at yield point; modulus of elasticity in tension; and specific gravity.
1.1 This classification system covers materials made from only virgin ABS polymers and blends of ABS polymers suitable for use in the extrusion of pipe and molding of fittings.
1.2 The requirements of this classification system are applicable only to the ABS polymers and blends of ABS polymers as classified and do not address the requirements of the finished pipe or fittings. The applicable ASTM standard specification for pipe or fittings shall be consulted for their requirements.
1.3 This classification system excludes ABS polymers and blends of ABS polymers made from reprocessed, regrind, reclaimed, or recycled materials. ABS rework, generated in-house by the original plastic manufacturer, may be used by that original manufacturer, provided the ABS product shipped meets the physical and mechanical properties required by its callout in Table 1.
1.4 This classification system and subsequent line callout (specification) provides a means for describing ABS materials used in the manufacture of pipe and fittings. It is not intended for the selection of materials. Material selection shall be made by those having expertise in the plastics field after careful consideration of the design and the performance required of the part, the environment to which it will be exposed, the fabrication process to be employed, the inherent properties of the material other than those covered by this classification system, and the economics.
1.5 This classification system and subsequent line callout (specification) provides for the classification of ABS polymers and blends of ABS polymers into groups based on five properties: Izod impact strength at room temperature, Izod impact strength at low temperature, deflection temperature under load, tensile stress at yield point, and modulus of elasticity in tension. The properties included are those required to identify the ABS material by the cell classifications.
Note 1—Other requirements necessary to identify particular characteristics of ABS polymers and blends of ABS polymers will be added as test methods become available or the need is identified.
Note 2—Due to pipe and fitting standards requirements a separate standard is planned for recycled materials.
Note 3—This classification system and ISO 7245-1984 are not equivalent.
1.6 The values stated in SI units shall be the standard. The values given in parentheses are for information only.
1.7 The following safety hazards caveat pertains only to the test methods portion, Section 13, of this classification system:This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
TABLE 1 Physical Property Requirements for ABS Pipe and Fitting Materials
Note—The minimum property value for any material will determine the cell number although the maximum expected value may fall within the next higher cell.
|Izod impact, min:||D256, Test Method A, Cantilever Beam (Izod-Type) Test|
|at 23°C (73°F), J/m||A||110||160||210||320||430|
|(ft-lbf/in. of notch)||A||(2)||(3)||(4)||(6)||(8)|
|at − 30°C (−22°F), J/m||A||50||110||160||210||270|
|(ft-lbf/in. of notch)||A||(1)||(2)||(3)||(4)||(5)|
|Deflection temperature under load, |
min, 1.82 MPa, (264 psi)
annealed, 3.18 mm (0.125 in.)
|Tensile stress at yield point, min:||D638|
|Modulus of elasticity in tension,|
|(psi)||A||(200 000)||(240 000)||(280 000)||(320 000)||(360 000)|