Graham Sweet Studios
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- Polystyrene Heads
MaterialOur polystyrene balls are manufactured from good quality expanded polystyrene. Our moulded balls ( from 20 mm to 500 mm ) are a higher density than many that you will find else where. Unlike most of the other moulded polystyrene balls available in the UK, these DO contain a flame retarding additive, which is especially important when they are to be used for shop and exhibition display.
These balls are often referred to as "styrofoam" balls, particularly in the USA and many European countries. This is generally incorrect, as "STYROFOAM tm" is an extruded polystyrene normally in blue, produced by The Dow Chemical Company. Our range of cut balls, from 150mm to over 2000mm are cut from pre-moulded blocks of EPS. These are cut on our own purpose built machines, which were designed by Graham Sweet.
FinishThe polystyrene balls can be finished in a wide range of colours. We can apply a paint finish, and get a good match to most pantone, RAL, or paint references. We also offer a glitter finish, which is ideal for Christmas decorations. We have a wide range of stock glitter colours. We can finish the balls with a "frosted" finish, in which we can offer a much wider range of colours. This effect looks similar to a fruit pastel.
The spheres can also be coated and textured with one of our natural Rock, snow, or metal finishes.
For some examples of our finishes, take a look through the poly ball photo gallery.
Hanging pointsWhen required, the polystyrene balls can be fitted with secure hanging points. We have evolved a very secure method of fitting these hanging / suspension points, whereby the sphere has a threaded bar bolted all the way through from top to bottom. Many production companies will insist on a method like this especially for the larger spheres - where "glued in" hanging points will not be secure enough. When necessary, our hanging points can be tested by a listing company, and a certificate of conformity can issued. This is standard procedure for all our larger spheres.
SizeOur moulded polystyrene balls are available form 20mm diameter, to 500mm diameter. For very large runs, we can mould customer specified sizes. The mould production is expensive, so is normally only an option when very large numbers are involved. Our range of cut balls, from 150mm to over 2000mm are cut from pre-moulded blocks of EPS. These are cut on our own purpose built machines, which were designed by Graham Sweet. These machines can be adapted to cut custom sizes and also custom shapes.
DiameterThe diameter of the ball is the same as its height. The radius is the measurment from the center to the surface, this is half of the diameter.
CircumferenceThis is the measurement around the outside of the ball at the widest point. This would be measured with a tape measure, similar to taking a waist measurement.
Surface areaThis is the area on the outside of the ball. This is usefull to know to have an idea of how much paint it will take to coat a sphere.
|Diameter||Approx inches||About the size of:||Surface area||Circumference|
|20 mm||0.8 inches||Grape||12.6 square CM||63 mm|
|30 mm||1.2 inches||28.3 square CM||94 mm|
|40 mm||1.6 inches||ping pong ball||50.3 square CM||126 mm|
|50 mm||2 inches||78.5 square CM||157 mm|
|60 mm||2.4 inches||113.1 square CM||188 mm|
|70 mm||2.8 inches||Tennis ball||153.9 square CM||220 mm|
|80 mm||3.1 inches||201.1 square CM||251 mm|
|90 mm||3.5 inches||254.5 square CM||283 mm|
|100 mm||3.9 inches||314.2 square CM||314 mm|
|120 mm||4.7 inches||452 square CM||377 mm|
|140 mm||5.5 inches||616 square CM||440 mm|
|150 mm||5.9 inches||707 square CM||471 mm|
|160 mm||6.3 inches||804 square CM||503 mm|
|170 mm||6.7 inches||908 square CM||534 mm|
|180 mm||7.1 inches||1018 square CM||565 mm|
|200 mm||7.9 inches||soccer ball normally 220mm||1257 square CM||628 mm|
|250 mm||9.8 inches||Basket ball||0.2 square metres||785 mm|
|290 mm||11.4 inches||0.26 square metres||911 mm|
|300 mm||11.8 inches||0.28 square metres||942 mm|
|390 mm||15.4 inches||0.48 square metres||1.23 metres|
|450 mm||17.7 inches||0.64 square metres||1.41 metres|
|500 mm||19.7 inches||0.79 square metres||1.57 metres|
|580 mm||22.8 inches||1.06 square metres||1.82 metres|
|600 mm||23.6 inches||1.13 square metres||1.88 metres|
|700 mm||27.6 inches||1.54 square metres||2.2 metres|
|800 mm||31.5 inches||2.01 square metres||2.51 metres|
|900 mm||35.4 inches||2.54 square metres||2.83 metres|
|1000 mm||39.4 inches||3.14 square metres||3.14 metres|
|1200 mm||47.2 inches||4.52 square metres||3.77 metres|
|1500 mm||59.1 inches||7.07 square metres||4.71 metres|
|2000 mm||78.7 inches||12.57 square metres||6.28 metres|