Boron Nitride(BN) tube

Good afternoon! We would like a quotation for Boron Nitride (BN). We need a tube with external diameter of 25,1 mm, internal diameter 23,3mm, and length of 150mm. But firstly, we would like to know if you could kindly send us a sample for this material, because we need to test it before the purchase. If our tests are succesfull, we have an estimated demand for 150 pieces per month initially.
I look forward to hearing from you soon.Thank you!
Raquel Alves Rodrigues