Bulk Density (BD)
~500 kg/m³
Measure mass of powder filling a 1L graduated cylinder under standard tap conditions.
Quality
Quality Standards
Acceptance criteria, target ranges and laboratory methods for every powder and liquid release parameter.
Powder release parameters
Release tests applied to base powder and finished powder products.
Moisture Content
8–12%
Gravimetric analysis — dry 10g sample at 105°C to constant weight, calculate loss.
Active Matter
15–25%
Two-phase titration (Epton method) or potentiometric titration with surfactant indicator.
Particle Size Distribution
D50: 300–500 μm
Sieve analysis using a mechanical shaker through standard mesh sieves (100–1000 μm).
Solubility
>95% in 5 min
Dissolve 1g in 100mL water at 20°C; visually assess residue after stirring for 5 minutes.
Dispersion in Water
<30 sec
Drop 1g powder onto water surface; measure time for complete sinking and dispersion.
Flow Rate
>80 g/sec
Measure powder flow through a standard funnel (Orifice 10mm) into a collecting vessel.
Storage Stability
Stable 6 mo
Store sealed samples at 40°C/75% RH for 6 months; re-test BD, moisture, and appearance.
Process-driven powder parameters
The parameters that drive spray-tower operation decisions.
| Parameter | Definition | Target |
|---|---|---|
| Bulk Density (BD) | Weight / Volume | ≈ 500 kg/m³ |
| Dynamic Flow Rate (DFR) | Volumetric flow / time | > 100 mL/s |
| Compressibility | (ΔV / V₀) × 100 | < 20% |
| Particle size (d10/d50/d90) | Sieve test | ≈ 250 / 500 / 800 µm |
| Solubility | % retained on 120 µm after 2 min | Tested at 20 / 40 / 60 °C |
| Dispensing | % residue in compartment | ≈ 0 |
| Caking | Storage tests | Ambient · 28°C/70% RH · 37°C/70% RH at 4 / 8 / 12 weeks |
Liquid release parameters
Release tests applied to finished liquid detergents and home-care products.
pH
7.5 – 9.5
Calibrated pH meter on neat product at 25 °C.
Viscosity
Recipe ± 10 %
Brookfield LVT, spindle 2 or 3 at 30 rpm, 25 °C.
Active matter
Recipe ± 0.3 %
Two-phase titration (Epton) with Hyamine 1622.
Density
Recipe ± 0.01 g/mL
Pycnometer or hydrometer at 25 °C.
Cloud point
Below storage T
Cool sample with thermometer until first cloudiness.
Foam profile
Recipe band
Ross-Miles, 0.1 % solution in hard water.
Stability
Stable 3 months
Storage at 40 °C / 50 °C accelerated aging.