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Description of key information

The moisture content was determined to be 0.5% by weight.
Based on the studies conducted, various interpretations and recommendations have been generated for the test material. Please see "Discussion" below for further information.

Additional information

The moisture content of the test material was examined using Standard Operating Procedure No.225, Rev 2. The moisture content was determined to be 0.5% by weight.

The following studies were looked into using standard operating procedures:

LP-05 - Minimum Ignition Energy - (Dust Cloud)

LP-11 - Minimum Ignition Temperature - (Dust Cloud)

LP-08 - Minimum Ignition Temperature - (Powder Layer)

LP-09 - Resistivity (Ambient and Low Humidity)

LP-24 - Charge Relaxation Time (Ambient and Low Humidity)

Based on the results of the study, the following recommendations have been suggested:

The following precautions are recommended when handling this material in pilot plant or manufacturing facilities:

• If other protective systems are not installed, suitably explosion vent all dust handling equipment not designed for containment. The vent areas should preferably be calculated based on the Kst rather than the St value.

• If nitrogen purging is considered as the protective system. it must operate with an oxygen level below (11.5) %v/v. The system should include an oxygen monitor and a shut-down facility in the event of excessive oxygen being detected.

• Bond and earth (ground) all plant and equipment to ensure that no isolated conductors are present. All personnel dealing with dusty operations must be earthed (grounded). Minimise the use of plastics when handling this material. Handle and store this material only in conductive or anti-static plastic bags since normal plastics are known to produce electrostatic discharges of up to 4 mJ. It is important to ensure that any containers into which conductive or anti-static liners are placed are themselves of a conductive material and earthed (grounded). Due to the very low minimum ignition energy for this powder. it is advisable to treat this material as if it is a flammable solvent vapour.

• Minimise the risk of electrostatic discharges from bulked material in the vicinity of flammable atmospheres, especially if handled at low humidity.

• This material did not show ignition or exothermic activity when heated as a powder layer. Therefore it is not applicable to base maximum surface temperature ratings of enclosures for electrical equipment on this information.

• The maximum surface temperature of enclosures potentially exposed to this material is calculated as 347°C. This is based on the lower of the values obtained by taking 2/3 of the Minimum Ignition Temperature for a Dust Cloud [520°C x 2/3 = 347°C] or 75K less than the Layer Ignition Temperature of the Dust Layer. In the case of this material. the effect on a dust layer is not applicable.

• Assess non-pilot plant or manufacturing operations for potential risk and take suitable precautions based upon the above points.