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The greater the viscosity of the cellulose ether, the better the water retention performance. Viscosity is an important parameter of MC performance. At present, different HPMC manufacturers use different methods and instruments to determine the viscosity of MC. The main methods are Haake Rotovisko, Hoppler, Ubbelohde, and Brookfield. For the same product, the viscosity results measured by different methods are very different, and some are even doubled. Therefore, when comparing the viscosity, it must be done between the same test methods, including temperature, rotor, etc. Generally speaking, the higher the viscosity, the better the water retention effect. However, the higher the viscosity, the higher the molecular weight of HPMC and its dissolution performance will be correspondingly reduced, which has a negative impact on the strength and construction performance of the mortar. The higher the viscosity, the more obvious the thickening effect on the mortar, but it is not proportional. The higher the viscosity, the more viscous the wet mortar will be, which is manifested by the sticking of the scraper and the high adhesion to the substrate during construction. But it does not help much to increase the structural strength of the wet mortar itself. During construction, the performance of anti-sagging performance is not obvious. On the contrary, some modified methyl cellulose ethers with medium and low viscosity have excellent performance in improving the structural strength of wet mortar. The greater the amount of cellulose ether added to the mortar, the better the water retention performance, and the higher the viscosity, the better the water retention performance.
The drop of putty powder is mainly related to the quality of ash calcium, but not to HPMC. The low calcium content of ash calcium and the inappropriate ratio of CaO and Ca(OH)2 in ash calcium will cause powder loss. If it has something to do with HPMC, then the poor water retention of HPMC will also cause powder drop.
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Yes, we have the equivalent grade, please send an email to sales@landu-China.com for more details.
| Products | Recommended Evaluation/Shelf Life Date (from Date of Manufacture) | Conditions of Shipment and Storage |
| Landercoll® all grades | 24 Months in bags | The product should be stored closed and kept indoors |
| Accurate® all grades | 24 Months in bags | The product should be stored closed and kept indoors |
The recommended re-evaluation/shelf life date is the length of time during which the product meets specifications when stored in accordance with recommended conditions. Beyond this date, it is recommended that the product not be used without further appropriate re-examination. The recommended reevaluation dates for Landercoll® cellulose ethers and Accurate® VAE Re-dispersible polymer powder products are based on an ongoing stability study in which products are stored in commercial packaging in warehouses in Jinan, Shandong, China. Temperature and humidity are monitored routinely, and the minimum and maximum temperature and humidity were 6 to 39°C and 5 to 100% respectively. Storing products at temperature and humidity conditions outside of these ranges may shorten the time period for product reevaluation.
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