Changing tax rate on Balsa Wood sheets for construction

My company sells plastic cellular foams and end grain balsa wood to our distributor in Rio de Janeiro for local resale. He informed me that the tax rate for the foam bases on NCM 3921.12.00 is increasing next week thus making our product uncompetitive in the country. Can you veify if the tax structure on this product is changing?

Also, I am struggling to identify the correct tax rate for balsa wood sheets. The balsa is grown and finished in Ecuador. the goods can be shipped directlty from the Ecuadorian port of Guayaquilor from our facility in Dallas, Texas. Can you help me identify the correct NCM code?

Charles

Malcolm
Wagner