The following Test Report was received from the good folks at

Twistdraai Colliery (SASOL): -

At the Twistdraai Colliery, the vehicles operate at a depth of 1,2Km to 1,6Km.The mine has high levels of Methane gas, where coal can ignite at 204 degC.

The test vehicle was a Toyota Dyna 2 ton truck, and the objective of the test, was to ascertain if the exhaust manifold temperatures, could be reduced, when coated with the appropriate POWERKOTE product.



Twistdraai Steenkoolmyn Twistdraai Colliery
Privaatsak X1030 Secunda 2302 Private Bag X1030 Secunda 2302

Republiek van Suid-Afrika Republic of South Africa

______________________________ ____________________________



Telefoon (017) 614-7001 Telephone (017) 614-7001

Telefaks (017) 614-7043 Telefax (017) 614-7043

13 March 2001



TEST ON TOYOTA DYNA 2 – TON TRUCK(5-104)
OBJECTIVE
Temperatures on ceramic lined exhaust manifold under normal operating conditions in the mine.

TEST CONDITIONS
1. 25 microns ceramic coated exhaust manifold (5-104)

(sprayed application and one hour cure time)

2. OPTEX THERMO HUNTER Temperature Scanner

3. Bin Load = 1950 Kg (Dead weight) + 400 Kg (5 persons)

4. Trailer Load = 1950 Kg (Dead weight)

5. The maximum vehicle speeds were between 30 and 40 km/hr.

The test was conducted at Twistdraai Central Colliery on 13 March 2001 with the following personnel:-

Pieter Harmse ; Frikkie Brits ; Marshall Stonehouse ; Nick Roux ; Rajan Chetty

TEST RESULTS

The maximun temperature of the manifold(at the exhaust flange) was 238o C ( after Ceramic lining 166o C). This was at the steepest incline of the mine.The highest temperature on Level ground was 142oC. The highest exhaust branch outlet temperature was 129oC

On switching off the engine at the bottom of the shaft the highest temperature recorded after 5 minutes was 89oC.

CONCLUSION
Ceramic coating of the exhaust manifold has decreased the surface temperatures by 72deg C.