I was looking to buy sodium Thiosulphate in a larger quantity so I googled about a bit and came across Intra-laboratories for me me this was an excellent experience and I would highly recommend them .I ordered a 25kg amount and it arrived in a very well packed parcel in side was a canvas type plastic sack which was cord stitched at both ends for strength and for safe delivery .Delivery was fast and everything arrived in great condition. I hope for anyone who is a first time buyer and is looking to buy from Intra-laboratories is to give them a try for me it was straight forward and a pleasure doing business with them.