buy lpg gas and industrial gases

We want to buy butane gas ( C4H10 ) with some details as follows :
1.Quantity : pack in tank and destination is Ho Chi Minh city port of Viet Nam,one tank in one shipment and we guarantee to carefully use your tank and put the amount of your tank in our bank so in case your tank is damaged our bank will pay it to you,after pull out your butane gas we will send empty tank back to you.
2.Quality : Please send us specifications of your product b email and we need Quality Certificate of your product which is issued by S.G.S in your country.
3.Payment : as your requirement ( we would like to use IRR L/C at sight ).
Hope will receive your quotation and start business with you soon.If you need any further informations please do not hesitate to contact us.