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D3021-01 – Standard Test Method Technical Guide
This specification establishes the requirements for chlorinated and chlorinated-brominated copper phthalocyanine green pigments in dry powder form. These pigments are widely utilized in the formulation of paints, printing inks, and related products, offering a range of commercial types tailored to diverse end-use applications. The values stated in SI units are to be regarded as the standard.
🧪 Composition and Properties
The pigments covered by this standard must be commercially known as phthalocyanine green. They may incorporate phthalocyanine blue or other ingredients during manufacture to improve or alter properties, but must be entirely free of any other organic or inorganic coloring matter. The conformance requirements are detailed below:
| 🟦 Property | 📏 Specification Requirement |
|---|---|
| Moisture & Other Volatile Matter (max) | 3.0 % |
| Coloring Matter (other than phthalocyanines) | None |
| Oil Absorption (relative to reference sample) | 90 % to 110 % |
| Mass Color and Character of Tint | Within mutually agreed limits |
✅ Quality Assurance: The strict prohibition of foreign coloring matter guarantees the spectral purity and chemical stability of the phthalocyanine green pigment. This is critical for achieving reliable, consistent color matches in professional-grade coatings and printing inks.
📏 Test Methods and Specifications
All testing must be conducted according to the specified ASTM standards or mutually agreed procedures. The mass color, tinting strength, and character of tint are determined via Test Method D387 and must match an agreed-upon standard. Oil absorption is evaluated using Test Method D281 and must fall between 90% and 110% of a mutually agreed reference sample. Moisture and volatile content is measured using Method A of Test Methods D280.
| 📐 Test | ⚡ Applicable Standard |
|---|---|
| Moisture & Volatile Matter | ASTM D280 (Method A) |
| Mass Color & Tinting Strength | ASTM D387 |
| Oil Absorption | ASTM D281 |
| Pigment Identification | Reaction with H₂SO₄ (sp gr 1.84) |
🧑🔬 Identification Test Note: The identification procedure involves reacting approximately 50 mg of the pigment sample in 30 mL of H₂SO₄ (specific gravity 1.84). A dark greenish-yellow to dark reddish color will form, depending upon the degree of bromination. This reaction specifically confirms the chlorinated-brominated phthalocyanine structure of the pigment.
📦 Sampling and Lot Certification
Two random samples must be taken from different packages within each lot, batch, day’s pack, or other defined unit of production. The sampling ratio is two samples for every 10,000 lb (4545 kg) of material. For shipments of less than 1000 lb, two samples shall still be taken. These samples may be tested individually or blended in equal quantities to form a composite sample for evaluation, at the option of the purchaser.
❓ Frequently Asked Questions
🔍 What types of pigments are covered by ASTM D3021?
This specification covers chlorinated and chlorinated-brominated copper phthalocyanine green pigments in dry powder form, designed for use in paints, printing inks, and related products.
💡 What is the maximum allowed moisture content?
According to Section 3.1, the maximum combined moisture and other volatile matter in the pigment is 3.0 %.
⚡ How is the oil absorption requirement defined?
The oil absorption of the tested pigment must fall between 90% and 110% of a reference sample that is mutually agreed upon by the purchaser and the seller.
📌 What is the sampling protocol for very small shipments?
For shipments of less than 1000 lb, the standard requires that two samples be taken at random from different packages within the shipment.