molding-urethane.md

 Urethane casted photoelastic samples
 ====================================
 
-Photoelastic samples can be casted! And this is, by far, the most convenient way to get it: more versatile (shape, mechanical properties, color...), cheaper and without absolutely any residual stress.
+Photoelastic samples can be casted! And this is, by far, the most convenient way to get it: more versatile (shape, mechanical properties, color...), cheaper and without absolutely any residual stresses.
 
-This method is based on product you can find online at [Smooth On](https://www.smooth-on.com/). We specify here that the different authors of this wiki do not have any link of any sort of link with this company unless it is clearly specified in a paragraph.
+This method is based on product you can find online at [Smooth On](https://www.smooth-on.com/). We specify here that the different authors of this wiki do not have any link of any sort with this company unless it is clearly specified in a paragraphs.
 
 The method described in details here have been first introduced by [Cox *et al.*](http://iopscience.iop.org/article/10.1209/0295-5075/115/64003/meta) and [Barés *et al.*](https://www.epj-conferences.org/articles/epjconf/abs/2017/09/epjconf162463/epjconf162463.html). In case you would like to refer to the method in a publication, please cite these papers.
 
-The full method is separated in three different steps. First you have to make a rigid backing mold to then make a soft mold in which you can cast your sample. In the following we go step by step through the method.  
+The full method is separated in three different steps. First, you have to make a rigid backing mold to, then make a soft mold in which you can cast your sample. In the following we go step by step through the method.  
 
 Making a backing mold for the mold of the sample
 ---------------------------
 
-The backing mold is nothing but the positive of your sample. You need it to cast the silicon mold that you will use to cast the urethane. Unfortunately, the urethane strongly sticks to almost everything (but the silicone we will use) so you definitely need this silicone mold. This means you need its backing mold. You cannot directly machine the urethane mold.
+The backing mold is nothing but the positive of your sample. You need it to cast the silicone mold that you will use to cast the urethane. Unfortunately, the urethane strongly sticks to almost everything (but the silicone we will use) so you definitely need this silicone mold. This means you need its backing mold. You cannot directly machine the urethane mold.
 
-You have different way to make this backing mold. The simplest is to glue something that have the same shape as your final sample in the bottom of a cup but just like in the examples below, you can also 3D print it of machine it. Here the material you will use does not really matter since the silicone we will cast does not sticks at all.
+You have different way to make this backing mold. The simplest is to glue something that have the same shape as your final sample in the bottom of a cup. But just like in the examples below, you can also 3D print it of machine it. Here the material you will use does not really matter since the silicone we will cast does not sticks at all.
 *  3D printed small cylinders backing mold:
+![2CounterMold_3](/uploads/d4fce3c40acea6200d16d8af68e0bebe/2CounterMold_3.JPG)
 
-![1CounterMold_2](/uploads/e6b397cc5df24b5deeb69cb397a02bcf/1CounterMold_2.JPG)
 *  Machined diabolo-shaped particle backing mold: 
+![1CounterMold_2](/uploads/e6b397cc5df24b5deeb69cb397a02bcf/1CounterMold_2.JPG)
 
-![2CounterMold_3](/uploads/d4fce3c40acea6200d16d8af68e0bebe/2CounterMold_3.JPG)
 
 
 Making a mold of the sample
 ---------------------------
 
-Once we have got the backing mold, we can cast the mold. This one is made of [Mold Star silicones](https://www.smooth-on.com/product-line/mold-star/): 'cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage'. They are different sort depending on what you are casting and how fast you want to go. In the following example we use 
+Once we have got the backing mold, we can cast the mold. This one is made of [Mold Star silicones](https://www.smooth-on.com/product-line/mold-star/): 'cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage'. They are different sorts depending on what you are casting and how fast you want to go. In the following example we use 
 [Mold Star 15 Slow](https://www.smooth-on.com/products/mold-star-15-slow/) which fits for most of the cases.
 
 Everything you need at this step is:
-*  A and B components of the Mold Star silicone.
-*  a cup and a fork to mix the silicone. You can use something more professional but this woks
-*  your baking mold
-*  protection gloves
-*  scale. You can also use anything to measure volume.
-You can find all the safety recommendations for Mold Star 15 Slow and how to use it [here](https://www.smooth-on.com/tb/files/MOLD_STAR_15_16_30_TB.pdf). Remember to check it first. 
+*  A and B parts of the Mold Star silicone.
+*  a cup and a fork to mix the silicone. You can use something more professional but this works.
+*  your baking mold.
+*  protection gloves.
+*  a scale. You can also use anything to measure volumes.
+You can find all the safety and processing recommendations for Mold Star 15 Slow and how to use it [here](https://www.smooth-on.com/tb/files/MOLD_STAR_15_16_30_TB.pdf). Remember to check it first. 
 
 ![3YouNeedMold](/uploads/cc65fb7a22cfeff3e97f543e931e0a2f/3YouNeedMold.JPG)