B747-400 Captain reported two 5-ton pallets containing chemicals that may have potentially been dangerous goods were improperly loaded. After conferring with the Dangerous Goods Specialist and Loadmaster; the cargo was reconfigured and the flight departed safely.

Narrative

During loading; the main deck contained two 5-ton axles for something like a Company truck or loader. These very large axles were loaded on pallets with wood cribbing to help hold it in place. During the inspection of the main deck it was noted that one of these pieces of wood was jammed into an adjacent pallets cargo containing chemicals. Upon initial inspection the substance was noted to be 'Syrine;' which the crewmember knew to be a chemical used in composite materials. It also stated it contained different forms of benzine and it listed hazards such as irritation.The crewmember alerted me and I came down and inspected the pallets. Our concern was the possibility of the cribbing rubbing and puncturing the container it was against. Further; we were concerned if there were undeclared dangerous goods. I contacted Dispatch and asked for a Dangerous Goods person to be brought into the loop. The Dispatcher said they would contact Operations who would talk to the station. This set up a circular loop; not really getting anyone new into the situation to evaluate it. After that call we located 6 other pallets with this same chemical and we were able to gain access to a clearer shot of the label with the full chemical name.I again returned and called Dispatch and asked to speak with a Dangerous Goods Specialist. This time I was placed in touch with what I believe was a Dangerous Goods Specialist. I passed along the name of the chemical and spelled it out. I wanted to know if the chemical should have been labeled as a dangerous good and be listed on the Dangerous Goods Form. The response was shocking; the deferred saying that they couldn't provide that information and that if I had a concern that I should pull it off. This provided no value for me in assessing the situation. Pulling the material off would have caused a major delay and would have been done simply because I was being provided no information.We had already consulted the Dangerous Goods Manual and found 'Styrene' but not the full name of 'Styrene DVB Copolymer.' I finally remembered the term MSDS and then conducted a search online to find an MSDS Sheet for Styrene DVB Copolymer and was able to locate one. I then reviewed the sheet and was able to determine the substance; though containing many chemicals that normally appear on the NOTOC was not classified as hazardous. The Loadmaster was also able to get the pallet flipped around so that the cribbing was not going to possibly puncture the container. We were nearly 4 hours late between the very late start for loading; the contractor's personnel not working; and issues with moving the pallets with the axles in the first place.Having no support from HQ and the Dangerous Goods Specialist was frustrating and didn't improve safety at all. It left us in a bind to figure it out for ourselves. This doesn't seem like a good plan. Improve Dangerous Goods support for crews.