EMS Catalog #14120 #14900
Resolution of Proportion of Epoxy Resin by utilizing its WPE Number
EMbed 812 ( EMS Catalog #14120 ) replaces Epon 812, which is not available. The proportions of DDSA, NMA, and DMP-30 in EMbed 812 overlap with in Epon 812.
Since W.P.E. (Weight per Epoxide Equivalent) values from the epoxies change from lot to lot, the only real reliable method to ensure reproducible hardness from the blocks is to apply the W.P.E. provided with every bottle. Based on Luft's formula, the next equation can be used, using the ration of anhydride equal to epoxy being .7:1.
A Good Example
Using 100g of EMbed 812 and Anhydride M.W. of 266 for DDSA, 178 for NMA, and the number of anhydride to epoxy resin Equivalent is .7.
Using the Above equation and 100g EMbed 812 getting used, having a W.P.E. of 149:
Final Mixture
Immediately before use, the 2 mixtures A and B are blended, and also the accelerator DMP-30 is put in the share of just one.5% - 2%. Growing the quantity of DMP-30 will raise the cure rate.
While using the EMbed 812 Resin Embedding Media Package, please make reference to our package instructions, EMS Catalog #14120 .