product designer


Parian to earthenware

I was pretty disheartened when my slip cast plant pots didn't quite go to plan earlier this week. All seemed to be going well with the casts until it came to removing the holes on either side of the plant pots. This got me thinking, is parian slip the best option? 

The workshop has lots of slips available on hand- terricota, read earthenware, white earthenware and porcelain, just to name a few! At first glance the earthenware slips really stood out to me, perhaps its because theres something really organic and natural about the word earthenware? Who knows! 

So I done a little research! Turns out earthenware hasa much smaller shrinkage size than parian. I found this quite appealing, even though I increased the model of my plant pot by 15% for the purpose of shrinkage, I was beginning to question whether I should have made it a little bigger.

It also has a water absorption of 5-8%, which could potentially maximise the amount of moisture the plants receive from the reservoir. Such quality makes it a popular choice among products like plant pots, tiles and ovenware. 

Earthenware bodies also exhibit higher plasticity than whitewall such as parian, making it much easier so shape. I decided to put it to the test! When it came to removing the holes from either side of the pot, eathenware worket a lot more. I decided to remove the holes using a circular shape instead of rectangular and this gave a much neater, cleaner cut.

 Removing the water flow holes from my plant pot

Removing the water flow holes from my plant pot

 First set of plant pots using white earthenware

First set of plant pots using white earthenware

Once the casts harden some more, I feel I will be able to sand them to a quality I am happy with. I took some time also making a second mould, allowing me to make two at a time. 

Two plant pots down, ten more to make! (Plus a few spares)

Rebecca Williamson