Always take great
care to verfy the validity of data you enter into your raw material
files. These files are the basis for all calculations performed
Material information may be obtained from a number of different
- this is usually the best quality data available. When requesting
information from this source ensure that it is supplied with the
date when the manufacturer obtained his/her laboratory analysis.
These days more and more manufacturers have web pages where you
may communicate with them about there products.
- this is secondhand information which may be out of date. Look
for the date when the analysis was done and if it is not reasonably
recent ask the supplier if they can obtain a more recent analysis
for you. All suppliers should be encouraged to have this information
on hand. Supporting retailers who provide material analyses is one
way of encouraging them to obtain this important information.
Books - the validity of data from books needs careful scrutiny
as it is not usually included with dates as to when the analysis
was carried out. Before using this data communicate, if possible,
with the authors seeking information about the validity of the data.
Perhaps they can tell you who the manufacturers are so that up-to-date
information can be obtained.
Glaze Programmes - similarly the validity of this information
needs checking to ensure that it is as up-to-date as possible. Glaze
programme authors can usually be contacted via the internet. When
obtaining information from other software packages look for entries
which refers to when the analysis was carried out.
listserv - is a very useful internet forum for seeking information
about raw materials.
these links for more information about: