Characteristic Features from SEM-Analyses for Standard Quality for 24 Weeks at 40 °C
| Area | Citrate Buffer, pH 6.0 | Phosphate Buffer, pH 7.0 | Sodium Bicarbonate |
|---|---|---|---|
| Wall near bottom | Micro-roughness | Delaminated areas Reaction zones (up to 140 nm) Micro-roughness | Reaction zones (up to 360 nm) Micro-roughness |
| Mid-body | No feature found | Micro-roughness | Micro-roughness |