Can treated Pine palings be used in ground?

[Skeeter]

Question , can treated pine palings be used as garden edging?
I understand there are different grade treatments, but just a little unsure what the difference is between palings and garden edging as they both are identical in size.
Any one help me out with this one?

[FENCED OUT]

Palings are usually H3 treated These are above ground use only, exposed to weather and dampness

Decking, fence pickets & CCA rails, pergolas, exposed bearers & cladding are usually H3

Garden edging is H4 In ground or ground CCA contact, outside Fence posts, sleepers, landscaping, garden edges and boxes

[Auction Crazy]

Ok from my understanding garden edge paling is H4 treated correct?
This will allow it to be used in ground.
Will using Palings that are H3 treated last , what time period would be the difference with H4 VS H3?
Any one know?

[Matthew_William]

According to me-H4 products are for in-ground or ground contact use outdoors. Typical use of H4 products includes, fence posts, sleepers, landscaping, garden edges and garden boxes. Resistant to rot and attack by termites or borers
H5 products are for in-ground, in water contact and ground contact as structural support components. Typical use of H5 products includes retaining walls and building poles. Resistant to rot and attack by termites or borers