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D4296-24 – Standard Test Method Technical Guide
📋 Scope and Importance
This practice, D4296-24a, covers procedures for sampling pitch at points of manufacture, storage, and delivery. The values stated in SI units are regarded as standard. Sampling is as important as testing; if sampling is improperly done, the sample will be in error, and the analysis will not represent the true properties of the material.
Samples may be taken for two purposes: to represent as nearly as possible an average of the bulk, or to ascertain the maximum variation in characteristics. A good sampling plan protects the consumer against acceptance of a bad batch, protects the producer against rejection of a good batch, and gives long-range protection to the consumer.
🔧 Sampling Methods
Samples of liquid pitches are taken from process lines, storage, and shipment containers in increments required to prepare a representative sample. Samples of solid pitches are taken from loading systems, storage, and shipment containers in increments. All increments are combined to form a gross sample, which is then reduced to a bulk sample for laboratory analysis.
Safety warning statements are given in Section 12 of the standard. Proper handling is essential to avoid hazards associated with pitch.
| 🟦 Term | 📖 Definition |
|---|---|
| Gross Sample | Original, uncrushed representative portion taken from a shipment of pitch. |
| Bulk Sample | Reduced and divided representative portion of the gross sample prepared for shipment to laboratory. |
| Composite Sample | Sample representative of entire consignment, generated by mixing mass fraction portioned gross samples from different lots. |
| Increment | Portion of material to be combined with others to provide a larger sample representing the whole. |
| Representative Sample | Portion extracted that contains constituents in same proportions as present in total volume. |
📝 Key Definitions
For definitions of terms used in this practice, refer to Terminology D4175. A sample is a portion extracted from a total volume that may or may not contain constituents in the same proportions. A representative sample must contain constituents in the same proportions as the total volume.
Always consult Section 12 for specific warning statements when handling pitch. Proper safety practices are mandatory to protect health and environment.
❓ Frequently Asked Questions
🔍 What are the two purposes of sampling pitch?
To represent as nearly as possible an average of the bulk materials sampled, or to ascertain the maximum variation in characteristics.
💡 How are liquid pitch samples taken?
From process lines, storage, and shipment containers in increments that are combined to form a representative sample.
⚡ What is a gross sample in pitch sampling?
The original, uncrushed representative portion taken from a shipment of pitch.
📌 Why is sampling considered as important as testing?
Because if sampling is improperly done, the analysis will not represent the true properties, and it may be impossible