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Scope
1.1 This specification covers all exothermic materials
which are made into sleeves (or shapes), placed in
the riser mold cavity to retard the solidification time
of the riser and thus promote feeding by atmospheric
pressure.
1.2 Two grades of material are available and selection
may depend on whether or not a buffer core is
to be placed between the sleeve (or shapes) and the
casting.
1.2.1 Grade 1 exothermic may be used without a
buffer core between the exothermic sleeve (or shapes)
and the casting as pickup of aluminum and silicon
on casting surface is negligible.
1.2.2 Grade 2 exothermic is used generally when a
buffer core is employed between the sleeve and the
casting to prevent excessive pickup of aluminum and
silicon at the casting surface (see Note 1) .
N OTE 1 .-When sleeves (or shapes) molded of Grade 2 are used
without a buffer core, the casting surface adjacent to the sleeve
will pick up aluminum, silicon and possibly small amounts of lead
and tin.
Acknowledgment
2.1 When specified, a vendor shall indicate this specification
number and grade number in all quotations
and when acknowledging purchase orders.
Identification
3.1 Containers for exothermic materials to be molded
into sleeves shall be plainly marked “Exothermic
Sleeve Material” or by vendor’s trade name.
3.2 The name of the manufacturer and batch number
shall be legibly marked on each container.
Quality
4.1 The exothermic material for sleeves (or shapes)
shall be of uniform color within the batch shipment
and free from foreign materials.
Sample Preparation
5.1 The number of containers to be sampled by the
consumer for routine testing shall depend on the
number of containers in a shipment.
5.1.1 When the shipment consists of 10 containers
or less, the number of containers sampled at random
shall be not less than 2 and preferably 4.
5.1.2 When the shipment consists of more than 10
containers, the number of containers to be sampled
at random shall be not less than 4 containers and
preferably 30 percent of the total number in the shipment
or a maximum of 10 containers (see Note 2 ) .
5.2 The composite sample shall not weigh less than
40 pounds or greater than 200 pounds and shall be
obtained by taking approximately equal weights from
each random selected container in the sample lot.
5.2.1 The composite sample shall be reduced by
quartering until a minimum 20-pound sample is
obtained.
5.2.2 An alternate method for reducing the gross
sample is ‘by the use of a sample splitter, such as
described in the AFS “Foundry Sand Handbook,” Seventh
Edition, Section III.
5.3 Identification of the sample shall indicate material,
trade name, manufacturer, batch number, source
of shipment and date shipment was received.
5.4 In case of a dispute between manufacturer and
purchaser, the number of units to be sampled shall
be according to ASTM C322, Procedure C.
N OTE 2 .-Fractional units shall be converted to the nearest whole
number, e.g., 6.4 containers= 6 containers, while 6.6 containers=
7 containers.
6. Technical Requirements
6.1 Contaminators in the steel casting.
6.1.1 The maximum pickup in the steel casting (see
Note 3 ) in aluminum, silicon, boron, lead, tin and
zinc 0.025 inch below the casting-sleeve interface shall
conform to the following limitations: