Learok Bar Compound Selection Chart
| Compound Grade |
Type Grade |
Binder | Product Colour | Hardness | Base Metal | Buff | Cut | Colour | |
| Tripolea | |||||||||
|
|
Tripoli | Medium | L | Brown | Medium | NF | C | 7 | 7 |
| Mostly suitable for flat brass components (low rake action). | |||||||||
|
|
Tripoli | Medium | M | Brown | Medium | NF | C | 7 | 7 |
| Slightly greasier version of 2630. | |||||||||
| 2640T | Tripoli | Medium | M | Brown | Medium | NF | C | 7 | 7 |
| Best for contoured components, good mop retention. | |||||||||
| 2468 | Tripoli | Medium | M | Brown | Medium | NF | C | 8 | 8 |
| Very clean, gives good cut and colour. | |||||||||
| 2470A | Tripoli | Medium | H | Brown | Medium | NF | C | 9 | 7 |
| Special binder gives extra mop retention for severe 'rake' action. | |||||||||
| Ferrobrite | |||||||||
| 3050 | FA | Coarse | H | Grey | Medium/hard | F | C or S | 10 | 2 |
| Slightly greasy. Good on very hard metals. | |||||||||
| 4040 | FA | Medium | H | Grey | Medium/hard | F | C or S | 9 | 4 |
| Greasier and coarser than 2464. For use on sisals. | |||||||||
| 2464 | FA | Medium | M | Grey | Hard | F | C or S | 8 | 6 |
| Very popular. Good all round performance. Clean in operation having a good colour. | |||||||||
| Britelea | |||||||||
| 2755 | CA | Coarse | H | Yellow | Soft | F or NF | C or S | 9 | 5 |
| High cut particularly where high 'rake'. Use sisal - tampico or ventilated buffs. | |||||||||
| 2076 | CA | Medium | M | White | Medium | F or NF | C or S | 8 | 6 |
| Gives good cut and colour on cotton or sisal mops. | |||||||||
| 2000D | CA | Medium | M | Green | Medium | F or NF | C or S | 7 | 7 |
| The most efficient cut & colour bar because of its unique abrasive qualities. | |||||||||
| 312 | CA | Fine | L | White | Medium | F or NF | C | 5 | 8 |
| Finishing bar with some cut. | |||||||||
| 309 | CA | Fine | L | White | Hard | F or NF | C | 4 | 9 |
| Finishing bar possessing very good colour. | |||||||||
| FF (Fine Finishing) | |||||||||
| 2445 | CA | Very fine | L | Dk. Green | Hard | F or NF | C | 4 | 9 |
| FF9 | CA | Very fine | M | White | Medium | F or NF | C | 3 | 10 |
| FF11 | CA | Very fine | M | White | Medium | F or NF | C | 3 | 10 |
Abrasive Types
| Tripoli | A soft abrasive normally used on non-ferrous metals |
| Calcined Alumina (CA) | A hard abrasive, many different grades of hardness & particle sizes. Used on both ferrous and non-ferrous metals |
| Fused Alumina (FA) | A very hard & tough abrasive, normally used on ferrous metals |
Binder Content
| H | High binder content necessary for heavy cutting operations (high metal removal). The binder is used to hold the abrasive particles onto the buff face |
| M | Medium binder content is normal for compounds used for medium metal removal but results in good brightness |
| L | Low binder content for finishing compounds, giving high brightness & clean components |
Type of Metal
| Ferrous (F) | Steel or stainless steel or any metal containing Iron |
| Non-Ferrous (NF) | Metal which does not contain Iron such as Copper, Brass, or Aluminium. |
Type of Buff
| S | Sisal - used for high metal removal on ferrous metals |
| C | Calico - used for all applications except where very high metal removal is needed |
| Cut (metal removal): Scale 1 increasing to 10 | |
| 1 | Very low metal removal typical of a high colour (brightness) compound |
| 10 | Represents a very high metal removal compound & would be associated with correspondingly low colour. |
| Colour (brightness): Scale 1 increasing to 10 | |
| 1 | Very low colour (brightness) associated with a high cut compound |
| 10 | Represents very high colour but will result in correspondingly low cut |
| Note: | The degree of cut & colour are assessed on non-ferrous metal in the case of Tripolea formulations and on ferrous metal in all other cases. |
