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D3046-96 – Standard Test Method Technical Guide
🧼 Specification Scope and Cleaner Types
ASTM D3046-96 defines the requirements for powdered hand cleaners formulated for use in industrial washroom dispensers. The standard is specifically designed for products capable of removing heavy occupational soils, greases, and oils. Two distinct product types are covered:
- Type A: A blend of high-grade anhydrous soda soap and borax, without the addition of lanolin.
- Type B: A soap and borax formulation containing a minimum of 1.0% anhydrous USP grade lanolin (based on anhydrous soap weight) to provide skin conditioning benefits.
Values stated in SI units are regarded as the standard; values in parentheses are provided for reference purposes only.
📊 Chemical Composition and Sieve Analysis
The hand cleaner, as received by the purchaser, must conform to strict chemical and physical parameter limits. The following table summarizes the mandatory specifications for both types.
| 🟦 Requirement | 📐 Type A (Min / Max) | 📏 Type B (Min / Max) |
|---|---|---|
| Anhydrous Soda Soap, % | 23.0 / 27.0 | 23.0 / 39.0 |
| Borax (Na₂B₄O₇·10H₂O), % | 72.0 / 77.0 | 57.0 / 75.0 |
| Matter Insoluble in Water, % | — / 0.2 | — / 0.3 |
| Anhydrous Lanolin, % (on anhydrous soap) | — | 1.0 / — |
| pH Value (1.0% Solution) | 8.7 / 9.7 | 8.7 / 9.7 |
| Retained on No. 40 Sieve, % | — / 15.0 | — / 15.0 |
| Retained on No. 100 Sieve, % | 45.0 / 80.0 | 45.0 / 80.0 |
📌 Terminology Note: The standard uses the term “weight” in Sections 3 and 4 for sieve analysis and the basis of purchase, respectively. Per the official note in the standard (Note 1), this reflects longstanding industrial trade usage and refers directly to the technically correct concept of “mass”.
Specific Borax Fineness (Type B only): The standard establishes a further particle size condition for Type B. The borax content in the product fraction passing a No. 30 sieve and retained on a No. 40 sieve must not exceed 1.0 g per 100 g of total product. Conversely, the borax in the fraction passing a No. 40 sieve and retained on a No. 200 sieve must meet or exceed 75 g per 100 g of total product as received.
⚙️ Performance Testing and Storage Stability
Section 5 dictates strict performance criteria. The hand cleaner must be a free-flowing powder of uniform composition. It must lather and rinse freely at room temperature (20 ± 2 °C / 68 ± 3.6 °F) in water with a hardness of 300 ± 20 ppm expressed as calcium carbonate (CaCO₃).
💡 Storage Stability: To ensure a robust shelf life, the product must not cake, change color, or develop any objectionable odor when stored for a full six months within a temperature range of 10 to 37.8 °C (50 to 100 °F). This verifies the formulation’s stability through typical distribution and storage conditions.
Sampling and chemical analysis must be performed in accordance with ASTM D460. Sieve analysis is conducted per ASTM D502. The purchaser reserves the right to utilize any additional available information to confirm the material conforms to the specification.
❓ Frequently Asked Questions
🔍 What is the primary formulation difference between Type A and Type B hand cleaners?
Type B is required to contain a minimum of 1.0% anhydrous lanolin (based on the weight of anhydrous soap) for skin conditioning. Type A is strictly a soap and borax mixture without lanolin. The borax concentration range also differs, with Type A requiring a higher concentration (72–77%) compared to Type B (57–75%).