- Hot search:
ISO 248-2-2012 pdf free download
ISO 248-2-2012 pdf free download.Rubber, raw Determination of volatile- matter content
Part 2:Thermogravimetric methods using an automatic analyser with an infrared drying unit
Caoutchouc brut — Determination des matières volatiles — Partie 2. Méthodes thermogravimétriques utilisant un analyseur automatique avec une unite de séchage infrarouge.
7.1 General
Either method A (which uses a pre-defined drying time) or method B (In which drying ends when the mass loss rate has decreased to a pre-defined level) can be chosen, provided the automatic analyser used offers the choice. The end point (the pre-defined drying time for method A or the pre-defined mass loss rate for method B) shall be determined for each of the two methods for each type or grade of rubber to be analysed.
7.2 Determination of end points for method A and method B
7.2.1 First take a typical sample of the type or grade of rubber being analysed and determine its volatile- matter content in accordance with one of the methods described in ISO 248-1.
7.2.2 Then, for method A, take a test portion of between 2 g and 15 9 and weigh it to the nearest 1 mg. Operating the automatic analyser in accordance with the manufacturer’s instructions, set a drying temperature (preferably between 100 °C and 120 DC) and obtain a drying profile (X-axis: time in mm. V-axis: volatile matter lost, in %). From the drying profile (see Figure 1), determine the time at which the volatile-matter content determined by the automatic analyser is equal to that determined in 7.2.1. Take this drying time as the predefined drying time to be used in method A for this particular type or grade of rubber.
7.2.3 For method B, take a test portion of between 2 9 and 15 g and weigh it to the nearest 1 mg. Operating the automatic analyser in accordance with the manufacturer’s instructions, set a drying temperature (preferably between 100 DC and 120 °C) and obtain a drying profile (X-axis: time, V-axis: mass). From the drying profile (see Figure 2), determine the mass loss rate at the point on the profile where the volatile-matter content corresponds to that determined in 7.2.1 – Take this value of the mass loss rate as the end point for use in method B for this particular type or grade of rubber.ISO 248-2-2012 pdf free download.
All resources on this website are from the Internet. It is only for personal study and research. No one is allowed to use it for any commercial purpose. If you need, please buy the genuine standard. If there is any infringement of your copyright, please contact the webmaster in time, and I will correct it immediately.
- Maybe you like
- More
- Latest Updates
- ISO 287-2009 pdf free download
- ISO 527-5-2009 pdf free download
- ISO 659-2009 pdf free download
- ISO 660-2009 pdf free download
- ISO 712-2009 pdf free download
- ISO 725-2009 pdf free download
- ISO 730-2009 pdf free download
- ISO 927-2009 pdf free download
- ISO 2041-2009 pdf free download
- ISO 3040-2009 pdf free download
- ISO 3506-2-2009 pdf free download
- ISO 3506-3-2009 pdf free download