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Useful Information


Communication on sales prices 2007
 



Definition of ABRASIVES
         Abrasives are all those chemical or natural materials having hardness greater than that of the object to be abraded.

         They may be in powder, liquids, mixes (liquid-powder), incorporated in cements, synthetic resins or metal alloys, and/or mounted on flexible, rigid, oscillating and rotating supports.

         They may be produced to level, smooth or polish marble, stone, granite, ceramics, glass, wood, steel and various materials requiring surface finishing.

        They may be used for cutting, drilling, smoothing and polishing the materials referred to above and everything else that can be imagined.

         The main characteristics of abrasives are defined by the particle size classification and the Mohs scale hardness.

Diamond particle size
         Our granulometry of either natural or synthetic diamond has been classified according to DIN 848 Standard.
At present the FEPA Standard (Federation Europeen des Fabricants de Produits Abrasifs) is in use in Europe.
It establishes a new suddivision in accordance to the sieve meshes. Considering the latest news in the technical field, this one establishes the most accurate control method for the diamond granulometry.
D150 - D900 diameters are used for diamond discs and blades.
The application is carried on in accordance to our experience and depends on the material to be sawn, on the size of blades and discs and on the machines available.

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MOHS hardness scale - Display the tableor save it on your hard disk in PDFformat (28 Kb)
1 TALC Graphite Carnallite  
 
2 CHALK Kaoline Halite  
 
 Bismuth Cryolite Mica  
 
 Gold 
 
 Aluminium  
 
3 CALCITE Copper Barite  
 
 Aragonite  
 
 Cuprite Malachite  
 
4 FLUORITE Chalcopyrite Sphalerite  
 
 Calamine  
 
5 APATITE Lapis Lazuli  
 
6 ORTHOCLASE Pyrites Hematite Porphyry Albite Opal Turquoise

 Cassiterite Onyx Chalcedony Silica rocks  
 
7 QUARTZ Amethyst Jasper  
 
 Tourmaline  
 
 Zircon  
 
 Aquamarine
 
 Garnet  
 
 Emerald 
 
8 TOPAZ Beryllium  
 
9 CARBORUNDUM Allumina Sapphire Ruby  
 
 Silicon carbide  
 
 Carborundum
 
 Boron Carbide  
 
10 DIAMOND  
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Durezza abrasivi sintetici al Carburo di Silicio verde chiaro 
Our light green silicon carbide synthetic abrasives are produced in two hardnesses:
  1. L (Light softer and for more delicate grinding): this hardness is worth for working straight edges, either in marble or granite and for horizontally working, as far as a delicate abrasion is required. As to micro-grains, we suggest low pressure and plenty of water, not re-cycled one.
  2. NL (Not Light Đ harder and more abrasive): this hardness is useful for working bevels and bullnoses, either in marble or granite. Moreover, it is always useful when a high abrasion is required.


Note: Our abrasives are synthetic, i.e. they have a binder that has not to be seasoned and does not harden like magnesian binder abrasives. Furthermore, in the long run the abrasion capacity remains unchanged.
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ABRASIVES IN LIGHT GREEN SILICON CARBIDE (Csi)
SUPER-ABRASIVES IN SYNTHETIC AND NATURAL DIAMOND
        Silicon carbide abrasives had in the past a magnesian binder namely a kind of binder that has to be seasoned min. 60 days and max. 120 days before use, otherwise it hardens to such an extent that it is no longer effective for very hard materials(ABRASIVES TYPE MIN).

         This kind of abrasives was for the aforesaid reasons unfit for storing either at the producer's or at the consumer's and so progressively fell out of use n spite of its very low cost.
In the meantime the new granites hardness (such as the Indian and the Brasilian granites) was increasingly higher and also the speed of the grinding-polishing machines- either for edges or for plane surfaces- was still higher and consequently they needed another kind of binder for their silicon carbide abrasives.
In this way silicon carbide abrasives with synthetic binder came into being and solved the problem of storing because ready for use soon after production and solved the problem of seasoning because they didnŐt need it and their abrasive power remained unchanged over time (ABRASIVES TYPE SINT).

         The limit of abrasives with synthetic binder is the thermoplasticity of the binder (its capacity of hardening or softening with the heat); therefore synthetic abrasives canŐt dry-work or with little water, on the contrary they need plenty of water and a good distribution of it from the centre to the outside using the centrifugal force.
In order to solve the above-said problem, it was created a kind of hybrid binder made of the old magnesian binder and the new resinoid binder (synthetic) and put in furnace at max. 150ˇ C after the seasoning of the abrasive with magnesian binder. This abrasive is used for the granis 00/16, 0/24, 1/36, 60/60, 2/120 et 3/280 that are medium-coarse grains to smooth and to grind and suitable for machines with the first heads arranged for this aim (ABRASIVES TYPE POROSIL).

         This kind of abrasive is a compromise between magnesian abrasives (and their requirements) and abrasives with synthetic binder (and their bounds). Actually the problem hadn't a final solution, because there was no thermosetting synthetic binder as for hardening, which was at the same time thermoplastic as for softening (due to lack of water).
Because of the higher cost of these synthetic binder, both natural and synthetic diamond abrasives were soon introduced to justify their use and to produce an expensive but profitable abrasive as far as performance and quality are concerned both for producers and for consumer (ABRASIVES TYPE DIAM).

         This was the progressive development of grinding-polishing abrasives: the kinds of abrasives (grinding wheels diameters 100, 130, 150, right and left wheels, Frankfurt, Minfrankfurt, sectors shaped like ellipsis and so on É) are bound to machine type and type of work to be done in different materials: marble, granite, stone, ceramic and glass.
Finally, it is possible to use synthetic abrasives in natural diamond and diamond sectors with metallic binder to increase the performance and the abrasive power as far as a particular grinding is requires.
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TYPES OF PACKAGING USED FOR SHIPMENT
No. of PIECESTYPE OF GRINDING WHEELMOD.MEASUREMENTS TARE WEIGHT GROSS WEIGHT
20 d. 100 FP 2A 29x22x11 gr. 300 kg. 7
120d. 100 FP2T70x31x25gr. 1000kg.38
10 d. 130 FP 1A 25x21x14 gr. 300 kg. 8
60 d. 130 FP 1T 69x27x31 gr. 900 kg. 44
10 d. 150 FP 3A 30x21x16 gr. 300 kg. 9
60 d. 150 FP 3T 66x31x35 gr. 1100 kg. 55
10 d. 250 PLATEAUX
70x27x29 gr. 1000 kg. 20
48 FRANKFURT 4 39x30x24 gr. 700 kg. 30 (*)
40 MINIFRANKFURT 2A 29x22x11 gr. 300 kg. 7

IMPORTANT: we have chosen the FP type grinding wheel as this is the one that weighs most. The number of contained pieces is however also the same for the grinding wheels with other holes, having the same diameter.
It is also important to emphasise that the 10 or 20-piece boxes are fixed and it is company policy to round off the number in the event of orders of pieces PER GRAIN being below 10 (for d.130 and 150) and 20 (for d.100); so far as the boxes of 60 and 120 pieces go, different boxes can be combined with different grains or loose pieces (like the supports) in order to fill a box. Naturally, in this case the gross weight will vary according to the contents of the box.

(*) The "Frankfurt" type box has a gross weight that varies as it can be used to contain various types of grinding wheels. The weight indicated refers to a box containing 48 Frankfurt.

The purpose of this short overview is to give the customer a global idea of our warehouse policy and therefore to understand how to go about ordering quantities without unfortunate mistakes at the time of receiving the goods.
         We remain at your complete disposal for any further details.
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Quotations and Assembly Charts for Frankfurt Segmental Wheels or Grinding Wheels
        

        Dear Sirs,
at the beginning of our business relationship you may have some difficulties in finding out how to use our abrasives and their division into different groups, according to the machines they are mounted on and the type of work that has to be carried out.
Although the present catalogue/price list helps you with pictures and descriptions, for each new enquiry you will submit us you are kindly asked to provide us with the following infos:

  • Machine type, complete with number of heads and features;
  • Working type, e.g. straightedge, bullnose, bevels, profiles...
  • Material type, e.g. Marble, Granite...
  • Diameter of grindle-wheel holder and thread pitch
  • Grinding-wheel type, diameter, hole, grains...


        We rely on your co-operation in supplying us with the required information, in order to facilitate and speed up the work of both of us.

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Technical information for waste disposal
April 2000

Please note that our grinding wheels consist of POLYMERISED POLYESTER RESINS and SILICON CARBIDE.
In addition THEY ARE NOT HARMFUL, NOT FLAMMABLE AND NON-EXPLOSIVE.

"...by the effects of the new regulatory regime, this waste (formerly special waste considered similar to municipal waste for disposal purposes) is to be classified as municipal to all intents, and is therefore not subject to the registration obligation."

Reggio Emilia, 20.06.1996 - AGAC Environmental Health Organisation - PROTOCOL NO. 26965
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Safety data sheets for chemical products
For those customers of ours who wish to have the safety data sheets of chemicals, visit the following web site where you can find all you need: http://www.zetalab.it/schede/schedeA.html
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Communication on sales prices
November 2006

Subject: PRICE INCREASE FROM JANUARY 2007

    As anticipated in our circular letter of July 2006, our company has decided to increase the price of its products from January 2007, as described below, in consideration of the fact that we have been receiving cost increases for the past five years in turn without ever having passed this burden on to our customers.

  • On all synthetic grinding wheels (including Profil grinding wheels, various diameters and hole sizes)
    +10% rounded to the nearest EURO
  • On all grinding wheel holder supports (GAL, RAL, NY... various diameters and pitches)
    +10% rounded to the nearest EURO

    The prices of all other articles remain unchanged.

    We therefore invite you to programme your orders as soon as possible, in order to benefit from the current price list, which will remain valid until 31st December 2006.

    Thanking you for your understanding, we remain
    Yours truly
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YEAR END CLOSING
To All Our Customers

As usual our company will be closing for the Christmas holidays and for stock-taking as follows

from December 22 2007 to January 6 2008 incl.

   Our fax will be working throughout this time (+39 0522-569887) and our e-mail address of course (info@biggiabrasivi.com).

   Thanking you in advance for your co-operation and wishing you all happy holidays.
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Last Update: 12.2007