| Titre : |
Viscosity vs rheology : why it is important to formulators |
| Type de document : |
texte imprimé |
| Auteurs : |
Robert Houlden, Auteur |
| Année de publication : |
2017 |
| Article en page(s) : |
p. 29-32 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Cosmétiques
Rhéologie
Viscosité
|
| Index. décimale : |
668.5 Parfums et cosmétiques |
| Résumé : |
The use of rheometer in conjunction with a viscometer during formulation development can provide relevant data in areas such as optimisation of sample selection before progressing to an external consumer panel test or passing onto a customer for assessment ; confirmation packaging is suitable for the product eg. roll-on, or orifice size; for suspension products estimation of polymers ability to suspend solids using yield stress data; comparison of excipients (eg polymers, oil/esters, film-formers or silicones) and their effect on 'skin-feel'/'drag' during application to the skin; potential improvements to SPF efficiency of sunscreen formulations. |
| Note de contenu : |
- Rheology and skin-feel
- Ease of removal from container = yield stress
- Primary skin feeling = low shear rate
- Secondary skin feeling = high shear rate
- Final impression due to residue on the skin
- Sunscreens and rheology
- FIGURES : 1. Viscosity of a carbopol gel measured at different speeds - 2. Brookfield viscosity vs. yield value - 3. Primary skin-feel of creams at 32°C - 4. Cone and plate rheometry viscosity vs. shear rate chart - 5. Viscosity vs shear rate at 32°C = 'skin feel' - 6. Sunscreens with poor rheological properties collapse into the 'skin folds' and do not maintain an even 20 µm film after application
- TABLES : 1. Sensory characteristics measured by descriptive analysis - 2. Yield value of several and suspensions |
| En ligne : |
https://drive.google.com/file/d/1s_umCOQVWBK1r7zYxBPpfjZkzerNY58P/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29309 |
in PERSONAL CARE EUROPE > Vol. 11, N° 4 (09/2017) . - p. 29-32
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