If you use Raise3D Standard White resin to print a model, and the white model becomes yellowish after post-curing, please read this document carefully. This document aims to help you to understand why the Standard White resin will become yellowish after post-curing, and provide you with the best practices to cure Raise3D Standard White resin.
When the model is printed on the Raise3D DF2 3D printer, due to the short printing and curing time, all the components (such as monomers, prepolymers, and so on) cannot be fully cross-linked, and the polymerization reaction has not reached a stable state. This means that the model has not obtained its final material properties, especially for models printed with the functional resin. At this point, the model requires post-curing in order to achieve the desired stable properties and state.
As can be seen in the following figure, the resin properties show increases of different degrees according to different ways of post-curing treatments:
As the resin properties increase, the colour of the model deepens with post-curing time, especially for light-coloured resins. Thus, the Standard White resin gains a yellowish colour after post-curing.
Due to the special ingredients added to Raise3D Standard White resin, the model will be whitened for a period of time after post-curing. The longer the model is stored, the closer the colour of the model will be to that before post-curing.
The whitening of Raise3D Standard White resin after post-curing is shown below:
If the post-curing time is 5 min, after being stored for about 1 hour, the colour of the model is slightly yellowish (as shown in the red box 1 in the figure above); after being stored for about 72 hours, the colour of the model is nearly the same as that before post-curing (as shown in the red box 2 in the figure above).
If the post-curing time is 30 min, after being stored for about 3 weeks, the colour of the model is nearly the same as that after the five-minute post-curing (as shown in red box 3 in the figure above).
Since the length of post-curing time will change the properties and the colour of the resin, in addition to Raise3D Standard White resin’s whitening properties, you can adjust the post-curing time of Standard White resin to achieve the desired state according to your needs.
The following figure shows the correlation between the post-curing time, post-cure placement time, and resin properties:
As shown in the figure above, you can select one of the following three post-curing practices for models with different functional uses:
If the model is an exterior part or for light functional uses:
The recommended UV light curing time is 5 min. After the curing process, the model will be slightly yellowish. But after about 72 hours, the model will whiten to a green-white. By this time, the resin properties can reach more than 80% of the final expected result.
If the model is for more functional uses and a quicker post-curing is required:
The recommended UV curing time is 30 min. After the curing process, the model will be an obvious yellowish colour, But after about 3 weeks, the model will whiten to be only slightly yellowish. You can polish the outer layer to remove the yellowish resin. At this point, the resin properties can reach about 90% of the final expected result.
If you want to achieve the best resin properties for your model:
The recommended UV curing time is 60 min. Please note that Raise3D Standard White resin cannot avoid being yellowish even following this practice.
[26.030-EN.1.0.20240710-DF2-How to Prevent Raise3D Standard White Resin from Being Yellowish after Post-Curing]
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