Granite supplied to you direct from our own quarries allows us to offer our customers the best products at extremely competitive prices.
Eurasian uses water exclusively for cutting and polishing all granite products whether they be tiles, slabs, countertops or memorials. This has been the industry accepted method for processing granite for many years however there are some producers that use kerosene in place of water as a medium for cutting. To try and remove the kerosene from the material they then soak the granite in water.
Granite is naturally porous and although the kerosene cannot be seen on the surface, the kerosene does remain within the granite. Processing granite using kerosene increases by 20%-30% the life of the diamond tools used therefore the processed price cost of the granite is lower however one ends up with an inferior product because:
1. The naturally ocurring dormant ferrous and ferric particles in the granite will be triggered by the kerosene and the resultant chemicals formed will eventually find their way out of the polished surface creating discolorations and pit holes.
2. The polished surface, which normally lasts for years, will begin showing dull patches within 18 to 24 months on kerosene processed granite. In many cases the polish is lost on the entire batch of granite giving a honed rather than polished finish.
3. When kerosene processed granite is used over traditional radiant heating systems, the kerosene will slowly evaporate out of the granite causing health hazards and unpleasant odours.
Do ensure when comparing prices and quality that you are comparing like with like.International Standards
The depth of gloss (mirror) polish will be a minimum 95% for most black granite materials.
Firstly it is important to note that Triple AAA Grade granite/limestone/marble/etc. does NOT exist within the international natural stone industry! This is terminology created by Ebay buyers and sellers who, in general, have very little natural stone trade knowledge and experience.
However Triple AAA Grade is used by the engineering industry for specifying accuracy and grading of a horizontal surface plate, black granite is very popular for this application, one main surface is processed extremely flat with an accuracy up to .00001"/.00025 mm for a grade AA or AAA plate:
1) Laboratory Grade AA
No one produces slabs, countertops or tiles with such a degree of accuracy for commercial or residential applications.
Granite is used for surface plates since they do not warp, are accurate under load conditions, have a uniformity and hardness, are easy to clean, have thermal stability, low porosity, vibration absorbent, non-corrosive, rust-proof, are non-abrasive and non-magnetic. Whilst it is possible to chip a granite surface plate normally it will only result in the chip however this does not affect the accuracy of the overall surface.
First Choice material is exactly that. When you receive it all you should need to do when fabricating is to cut to size, profile whatever needs to be done etc. The polishing should be of a high gloss standard and there should be no visual defects in the material. Wastage should be low.
Tiles will be ready for immediate installation with no wastage whatsoever and there should be no visible imperfections.
Commercial Quality usually means that there will almost certainly be some obvious defects such as small natural hairline cracks and maybe some blotches, clouds or possibly lines in the material. A good sawyer and fabricator can use the slab to his best advantage however, obviously, a reasonable trade knowledge is required to get the best out of the slabs.
It is possible to save polishing costs by not grinding the slabs thoroughly through each process and is accepted as a norm by many project specifiers therefore pay attention if the polish does not seem very reflective.
A great many slabs seen in the USA are actually Commercial Choice and not First Quality as purported. There is nothing wrong with Commercial Choice material. Most companies buying on price buy this quality without even knowing it! A Brazilian Government report concluded that 90% of exported Brazilian granite slabs to the USA were of Commercial Quality.
Tiles will be ready for immediate installation with little or no wastage however it is most likely that visible imperfections such as an open vein or an unfavourable colour shade or even a sub-standard surface polish is evident. Quite often veining that would be unacceptable in large slabs are acceptable in Commercial Quality tile format.
Second Quality is not very well known to the public and should really only be used for large scale contracts unless specifically requested where the slabs are to be cut into smaller modules. There will be many repairable natural defects and, most likely, blotches in the material. For experienced fabricators this can be a great way to save money on raw material costs however the extra time taken to make best use of the material must be taken into account.
Buying Second Quality should only be done either by self-inspection or by a trusted inspector. Wastage could be high and should not be considered for use as counter tops.
Tiles should be ready for immediate installation however wastage will be much higher and visible imperfections such as open veins, even cracks, unpopular colours and poor surface polish could be evident.Limestone, Marble, Quartzite, Sandstone, Slate, Travertine
Many of the above quality guidelines also apply to most polished natural stones however the popular tumbled and antiqued surfaces seen especially on many limestones, marbles & travertines these days, plus the ever-popular natural cleft/split sandstones and slates, obviously make some of our inspection suggestions superfluous, however the basic general natural stone standards are still applicable.
Therefore we cannot repeat often enough: