Rennet casein purchase request in bulk quantity-Pakistan

One of our client requires Rennet Casein

Rennet Casein 90 Mesh,
Quantity: 6 x 20ft Containers.
Shipment Schedule: 1x20 ft container each month
Specifications:
Chemical/Physical:
Protein (N x 6.38): 80.50%
Ash (825 °C): 8.30%
Fat: 0.90%
pH 7.0
Water (102 °C) 10.30%