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D6263-23 – Standard Test Method Technical Guide
This article provides an overview of ASTM D6263-23, Standard Specification for Extruded Rods and Bars Made From Rigid Poly(Vinyl Chloride) (PVC) and Chlorinated Poly(Vinyl Chloride) (CPVC). This specification covers material, dimensional, and workmanship requirements for extruded rods and bars used in the fabrication of mechanical grade plastic products and end items.
📐 Scope and Classification
ASTM D6263-23 applies to extruded rods and bars produced from rigid PVC and CPVC compounds. The standard uses a classification system described in Section 4 to designate specific material characteristics required for specialized applications, such as impact resistance or thermal performance. Values throughout the standard are expressed in inch-pound units, with SI equivalents provided in Table 1 for reference. The standard also permits the use of regrind and recycled PVC material, provided it meets the same performance and dimensional criteria as virgin material and has not been exposed to severe service environments that could compromise end-product performance.
⚙️ Test Methods and Key Measured Properties
Mechanical and physical properties of extruded rods and bars are determined using standardized test methods referenced in Section 2. These include Izod pendulum impact resistance per Test Method D256, tensile properties per Test Method D638, and flexural properties per Test Methods D790. Specimens are conditioned in accordance with Practice D618. The following table summarizes representative property requirements for typical PVC and CPVC rod and bar formulations.
| 🟦 Property | 📏 Test Method | 📐 Typical PVC Value | 🎯 Typical CPVC Value |
|---|---|---|---|
| Izod Impact (ft·lb/in) | D256 | 0.5 | 0.8 |
| Tensile Strength (psi) | D638 | 6,000 | 7,000 |
| Flexural Modulus (psi) | D790 | 400,000 | 450,000 |
💡 Property values shown are representative; actual requirements depend on the specific cell classification selected under the standard for the intended application.
📊 Dimensional and Workmanship Requirements
The standard includes dimensional tolerances for extruded rods and bars to ensure uniformity in fabrication. Workmanship requirements mandate that products be free from defects such as voids, cracks, inclusions, or other imperfections that affect performance. Table 2 below provides typical tolerances for round rod diameters.
| 📐 Diameter Range (in) | 🎯 Tolerance (in) |
|---|---|
| 0.125 to 0.500 | ±0.005 |
| 0.501 to 1.000 | ±0.010 |
| 1.001 to 2.000 | ±0.015 |
⚠️ NOTE: Dimensional tolerances may vary by shape and size; always refer to the full standard for exact limits. Good workmanship practices must be followed to ensure quality.
❓ Frequently Asked Questions
🔍 What types of plastics are covered under ASTM D6263-23?
The standard covers extruded rods and bars made from rigid poly(vinyl chloride) (PVC) and chlorinated poly(vinyl chloride) (CPVC).
💡 Can regrind or recycled PVC be used for production?
Yes, regrind and recycled plastics are allowed, provided products meet all classification, physical, dimensional, and workmanship requirements and the recycled material has not been exposed to harsh environments that could adversely affect performance.
⚡ Which test methods are used to measure mechanical properties?
Izod impact resistance is measured using Test Method D256, tensile properties via Test Method D638, and flexural properties using Test Methods D790. Conditioning is performed per Practice D618.
📌 Are there SI unit equivalents available?
Yes, SI units are provided in Table 1 of the standard for reference purposes, but inch-pound units are the primary standard for property and dimensional tables.