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D4069-95 – Standard Test Method Technical Guide
ASTM D4069-95 (Reapproved 2020) provides the standard specification for virgin impregnated activated carbon used to remove gaseous radio-iodine species from gas streams. The values stated in SI units are regarded as standard, and the specification is under the jurisdiction of ASTM Committee D28 on Activated Carbon. This standard was developed in accordance with internationally recognized principles on standardization established by the WTO TBT Committee.
🏗️ Scope and Referenced Documents
The scope of D4069 covers the physical properties and performance requirements for virgin impregnated activated carbon intended for radio-iodine removal. Reactivated carbon is strictly prohibited. The standard relies on a suite of referenced ASTM test methods for characterization, including D3803 for nuclear-grade performance testing, D2854 for apparent density, D2862 for particle size distribution, D2866 for total ash content, D2867 for moisture, D3466 for ignition temperature, D3802 for ball-pan hardness, and D3838 for pH. Terminology is governed by D2652, and sampling must follow Practice E300.
⚠️ Critical Compliance: Impregnated activated carbon furnished under this specification must be virgin material and is subject to the document control provisions of Section 7 of ANSI/ASME NQA-1, the Quality Assurance Program Requirements for Nuclear Facilities.
🔬 Terminology and Material Specifications
The standard establishes precise definitions to ensure uniformity in procurement and testing. A lot is defined as a quantity of the same grade or type produced under a single manufacturing order. A batch is a homogenized quantity of the same grade or type exhibiting uniform properties, with a strict maximum size limit of 10 m³. A qualification test is a one-time evaluation performed on three random grab samples, each at least 500 cm³, from a homogenized batch to verify suitability of a vendor’s grade. A batch test is a routine test performed on a representative sample of each subsequent batch for ongoing compliance verification.
| 📏 Parameter | 📐 Specification |
|---|---|
| Material Type | Virgin impregnated activated carbon |
| Reactivated Material | Prohibited |
| Maximum Batch Size | 10 m³ |
| Qualification Test Samples | 3 grab samples, each at least 500 cm³ |
| Quality Assurance Standard | ANSI/ASME NQA-1, Section 7 |
⚛️ Testing and Performance Requirements
The specification mandates a clear distinction between initial qualification testing and routine batch testing. The performance for radio-iodine removal is determined according to Test Method D3803. The following table summarizes the key ASTM test methods referenced for evaluating the physical properties of the carbon.
| 🧪 Property | 🔬 Test Method |
|---|---|
| Radioiodine Removal Performance | D3803 |
| Apparent Density | D2854 |
| Particle Size Distribution | D2862 |
| Total Ash Content | D2866 |
| Moisture Content | D2867 |
| Ignition Temperature | D3466 |
| Ball-Pan Hardness | D3802 |
| pH | D3838 |
| Terminology | D2652 |
| Sampling | E300 |
✅ Key Takeaway: Proper distinction between the one-time qualification test (3 grab samples from a homogenized batch) and the routine batch test (representative sample of each batch) is essential for maintaining the stringent quality assurance required for nuclear-grade gas phase filtration.
❓ Frequently Asked Questions
🔍 What does ASTM D4069 specify?
It provides the standard specification for virgin impregnated activated carbon used to remove gaseous radio-iodine species from gas streams, detailing physical properties, performance requirements, and test methods.
💡 Can reactivated carbon be used under D4069?
No. Section 4.1 explicitly requires the carbon to be virgin material. The use of reactivated carbon is strictly prohibited for this radio-iodine removal application.
⚡ What is the maximum allowable batch size?
Note 1 of the standard specifies that the maximum allowable batch size shall be 10 m³ to ensure homogeneity of the physical properties and performance characteristics.
📌 What is the principal difference between a qualification test and a batch test?
A qualification test is a one-time evaluation of a vendor’s grade or type using three random grab samples (at least 500 cm³ each), while a batch test is a routine verification performed on a representative sample of each individual homogenized batch for ongoing compliance.