Catalogs >
Sartorius Group >
Fast and Precise Determination of Total Solid Content of Latex

Fast and Precise Determination of Total Solid Content of Latex
6Pages

$Fast and Precise Determination of Total Solid Content of Latex$

Catalog excerpts

$Fast and Precise Determination of Total Solid Content of Latex - 1$

Application Note May, 2022 Keywords or phrases: LMA200, Moisture analysis, Moisture determination, Total solid content determination Fast and Precise Determination of Total Solid Content of Latex Introduction The fast, reliable determination of total solid content of latex precursors is critical for further processing into medical products. In order to determine the total solid content of latex, current standards such as the ASTMD1417-16 (Standard Test Methods for Rubber Latices – Synthetic) are used. The methods presented in chapter 4 of the ASTMD1417-16 can be very time-consuming. For example, a drying oven measurement including the cooling process requires about 40 minutes, while measurement in the infrared (IR) dryer requires about 25 minutes. In this application note we explain how to develop a method to determine the total solid content of latex with the LMA200 microwave moisture analyzer in a little over one minute. Additionally, we show that the data is comparable to recognized reference methods.

Open the catalog to page 1

$Fast and Precise Determination of Total Solid Content of Latex - 2$

LMA200 Microwave Moisture Analyzer The Sartorius microwave drying method, LMA200, offers a fast alternative to the conventional methods based on convection heating in a drying oven. LMA200 microwave moisture/solid analyzers have been specially designed for routine use. They have the resolution of an analytical balance and cover all applications in research and development, manufacturing and quality assurance. In addition, Sartorius offers individualized method development services for measuring the total solid content for specific applications. The LMA200 moisture analyzer operates...

Open the catalog to page 2

$Fast and Precise Determination of Total Solid Content of Latex - 3$

Step Two : Sampling the Latex It is very important to homogenize the latex before sampling, preferably by stirring with a suitable tool (e.g., metallic spatula). Here are a few important reminders: Do not stir in latex that is already dried. Carefully remove these solid components beforehand as removal during a measurement series can lead to contamination. Do not sample from any portion of a formed skin as it can interfere with the drying process. Sampling with a spatula is not recommended due to sticking of sample to the spatula surface. Instead, use a disposable pipette. If the viscosity...

Open the catalog to page 3

$Fast and Precise Determination of Total Solid Content of Latex - 4$

Step Four : Ensuring Reliability and Robustnesst To ensure that this method provides reliable and robust results, take a series of measurements and perform statistical analysis using the formulas shown in Figure 3. To evaluate this method, we performed 11 measurements of the total solid content of latex and recorded the results in Table 2. This helps to correctly assess and evaluate the measured values in later measurements. The following evaluations have proven to be valuable: minimum and maximum values, mean value and measurement uncertainty. Comparison to Other Methods The microwave oven...

Open the catalog to page 4

$Fast and Precise Determination of Total Solid Content of Latex - 5$

We have presented a simple method for measuring the total solid content of latex samples on the Sartorius LMA200 Moisture Analyzer, which uses a microwave drying method. We also presented guidelines on the optimal way to set up the sample to avoid artifacts like skin formation that interfere with measurement accuracy. The microwave method yields significant time savings per measurement, allowing laboratories to be more productive. Additionally, the data quality is comparable to standard oven and IR methods. Explore More: Microwave Moisture Analyzer LMA200

Open the catalog to page 5

$Fast and Precise Determination of Total Solid Content of Latex - 6$

Germany Sartorius Lab Instruments GmbH & Co. KG Otto-Brenner-Strasse 20 37079 Goettingen Phone +49 551 308 0 For further contacts, visit Specifications subject to change without notice. Copyright Sartorius Lab Instruments GmbH & Co. KG. Status: 07 | 2022

Open the catalog to page 6