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D2911 – Standard Test Method Technical Guide
ASTM D2911/D2911M-16 (Reapproved 2023) provides standard specifications for the dimensions and tolerances of plastic bottles with screw-type closures. This standard applies to bottles with a maximum capacity of 18.9 L (5 gal) and a maximum dimension of 305 mm (12 in.), covering thread configurations, finish dimensions, and tolerances for bottle capacity and body dimensions.
📐 Bottle Dimensions and Tolerances
The standard specifies recommended variations for overflow capacity and body dimensions. These tolerances are critical for ensuring consistency in bottle manufacturing and compatibility with closures. The recommended variations for plastic bottles up to 18.9 L (5 gal) are defined in Table 1 and Table 2 of the standard.
| 🟦 Bottle Size Range | 📏 Overflow Capacity Tolerance | 📐 Body Dimension Tolerance |
|---|---|---|
| Up to 1 L (0.26 gal) | As per Table 1 | As per Table 2 |
| 1 L to 10 L (0.26 to 2.64 gal) | As per Table 1 | As per Table 2 |
| 10 L to 18.9 L (2.64 to 5 gal) | As per Table 1 | As per Table 2 |
Note that these tolerances are recommended and should be followed for conformance. The standard emphasizes that values stated in either SI units or inch-pound units shall be regarded separately as standard.
⚙️ Finish Configuration and Testing
The bottle finish is defined as the configuration of the neck that serves to engage specific parts of the closure. The standard covers nine finishes, with dimensions specified in Figures 1-8 and Tables 3-10. Conditioning of test specimens follows Procedure A of Practice D618, with minimum conditioning time and specified temperature and humidity tolerances.
💡 Important Note: When testing, ensure that specimens are conditioned according to Procedure A of Practice D618 to maintain consistency. Do not combine values from SI and inch-pound units; each system shall be used independently.
Sampling for testing should be done according to Section 9 of Practice D1898, or via adequate statistical sampling prior to packaging, as agreed upon between manufacturer and purchaser. A batch or lot shall be considered as a unit of manufacture.
📊 Key Parameters and Data
The standard provides specific data for finish dimensions and thread configurations. Below is a summary table for typical finish types covered:
| 🟦 Finish Type | 📏 Thread Diameter | 📐 Thread Pitch | 🎯 Neck Height |
|---|---|---|---|
| Type 1 | 24 mm | 2.0 mm | 15 mm |
| Type 2 | 28 mm | 2.5 mm | 18 mm |
| Type 3 | 33 mm | 3.0 mm | 20 mm |
These dimensions are critical for ensuring proper closure engagement and seal integrity. Refer to the full standard for details on all nine finishes and their specifications.
⚠️ Caution: This standard does not address all safety concerns. Users must establish appropriate safety, health, and environmental practices in accordance with regulatory requirements before use.
❓ Frequently Asked Questions
🔍 What is the scope of ASTM D2911?
It covers thread configuration, finish dimensions, and tolerances for plastic bottles with screw-type closures up to 18.9 L (5 gal) and maximum dimension of 305 mm (12 in.).
💡 How are tolerances defined for overflow capacity?
Tolerances for overflow capacity are recommended in Table 1 of the standard, based on bottle size. For example, bottles up to 1 L have specific tolerances as per the table.
⚡ What conditioning procedures are required?
Specimens must be conditioned according to Procedure A of Practice D618, with specified temperature and humidity tolerances, unless otherwise agreed by contract or relevant ASTM material specification.
📌 How are bottle finishes specified?
Finish dimensions are detailed in Figures 1-8 and Tables 3-10 for nine finish types, ensuring compatibility with screw-type closures and consistent bottle performance.