Material Choice

As part of the 8 planet collection, each material of each from will be defined by the planets albedo, relating the the materials own albedo.

I have had to scale some of the forms a bit differently depending on what material they are going to be made out of due to materials shrinkage, most notable in porcelain with a shinkage of 15%. Aluminium and Bronz also have a shrinkage of 2-3% and Terracotta and White Earthenware slip have a shrinkage of 9-10% which needs accounting for.

I needed to know the reflectivity of each materiel to match it to the planet. Below is my initial estimations for the reflectivity of each material along with the material shrinkage-

Planet Name Bond Albedo Material Material Shrinkage
Mercury 0.068 Walnut
Mars 0.25 Terracotta 10%
Neptune 0.29 Oak
Uranus 0.3 White Earthenware 10%
Earth 0.306 Porcelain 15%
Saturn 0.342  Lightly patinated Bronze 2%
Jupiter 0.343 Aluminium brushed 2%
Venus 0.9 Bronze Polished 2%

With this in mind I went about doing some material testing to establish what the materials might look light together and to try and establish it reflectivity. I first gathered the material I was going to test, polishing some bronze and brushing some aluminium. Below are some of the initial material samples-

I then took them into a dark room and using a laser, shone a point of light onto each surface measuring how much light was bounced back onto a piece of white card. I decided I didn’t like how the patinated Bronze fitted in with eh rest of the materials. It had quite a high reflectivity due the metallic surface, yet to the eye it looks very dark and stuck out like a sore thumb! Therefore I decided to add in a new material; concrete. I love the minimalist aesthetic of concrete, along with its surface finish. I i the least reflective of all the materials. Below are the materials in the final order of reflectivity-

Concrete Mercury
Walnut Mars
Terracota Neptune
Oak Uranus
Porceline Earth
White earthenware Saturn
Bronze Venus
Aluminum Jupiter

img_20170216_140807

And the materials in order of the planets as they will be in the final exhibition-

Concrete Mercury
Bronze Venus
Porcelain Earth
Walnut Mars
Aluminum Jupiter
White earthenware Saturn
Oak Uranus
Terracotta Neptune

img_20170216_140018

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