Products > Polyurethane Spheres

The Bonaprene spheres are made to the highest standards of spherical geometry and surface finish to give the best sealing function. Bonaprene use the highest grades of polyurethane material for high wear resistance, resilience and resistance to compression set.

Spheres

Reference Number

Diameter mm

          Diameter inch

            Stock Item

1476

32

1¼ ”

1814

35

13/8”

1477

38

1½ ”

UAV0001

1587

41

15/8”

1390

48

17/8”

1081

51

2”

1199

58

2¼ ”

1089

63

2½”

1110

70

2¾”

UAV0005

1115/1171

76

3”

1074

81

3¼”

1308

84

35/16”

1198

89

3½”

UAV0009

1091/1173

95

3¾”

1090

100

4”

UAV0013

1174

120

4¾”

UAV0017

1075

128

5”

UAV0024

1082/1092

146

5¾”

1192

150

6”

UAV0025

1310

153

6”

1694/1782

180

7”

UAV0029

1107/1095

190

7½”

UAV0033

1105

245

9¾”

1682

250

9¾”

UAV0037

1116

290

113/8”

UAV0041

1893

350

13¾”

UAV0045

1094

378

14¾”

Float Spheres with Foam Inserts

Bonaprene’s standard spheres have a specific gravity of 1.22. Where spheres that can float are required Bonaprene produce a polyurethane encapsulated foam sphere to give a specific gravity of below 1. The thick polyurethane coat ensures these spheres have all the robustness of the standard product.

Polyurethane (PU) Foam Floats

Complimenting Bonaprene Product’s range of polyurethane (PU)
spheres is a wide range of polyurethane foam floats. Bonaprene
Products make these rigid integral skin polyurethane floats with
and without stainless steel inserts.

Bonaprene Products use a two component rigid medium density polyurethane foam with integral skin foam. The foam contains no halogenated blowing agents as water is used as the only blowing agent. Thus the polyurethane system has zero ozone depletion potential (ODP=0) and zero green house warming potential (GWP=0). The use of special surface active ingredients gives a very fine cell structure, good mechanical properties and the best adhesion on all usual construction materials. 

Spheres with Metal Inserts

Where heavier spheres are required Bonaprene encapsulate a range of metal inserts in the polyurethane. These include aluminium, cast iron and hollow aluminium and cast iron inserts. Each insert is shot blasted, cleaned and bond sprayed to ensure a homogenous polyurethane/ metal sphere resistant to splitting and separation. The picture on the right shows a cast iron insert, from left to right, in it's natural state, then after shot blasting, cleaning and with a high temperature bonding agent applied and finally with a clear polyurethane casting to make the final sphere product.

Polyurethane (PU) & Nitrile Seats

Bonaprene Products also manufacture a wide range of polyurethane seats to complement the range of spheres. Made from the same grade of high wearing urethane as the spheres, they offer high resilience and resistance to compression set. Combined with Bonaprene’s in-house tool making facility Bonaprene can offer seats to meet any requirement.