Slate powder & granules are purpose-made inert mineral fillers produced from high quality slate, extracted from the Delabole Quarry, situated in North Cornwall. The Delabole Slate company pioneered the production of high performance slate powder in 1908 and now has over 90 years of accumulated experience in the production and application of mineral fillers.

Delabole Slate is of excellent quality, highly resistant to atmospheric attack and meets the exacting requirements of current industry standards, which are particularly concerned with durability.

• Stability and inertness.
• Its consistency of particle size and the ability to produce a variety of closely sized fractions over a wide overall size range.
• High specific surface.
• Low absorption characteristics for both oil and water.
• Relatively low abrasion characteristics.
• High specific gravity and bulk density.
• Low gassing characteristics when heated. Results have been obtained using standard analytical procedures (wet methods).

Delabole Slate powders are produced in a wide range of sieve and sub-sieve fineness grades. The standard gradings and their typical particle size analyses are listed in Table 2. Fig. 3 illustrates the typical particle size analyses graphically. Photomicrographs of the coarsest and finest gradings are shown on the technical page in Figures 1 and 2 respectively, and to give an idea of scale the insets show a human hair to the same scale. These illustrations clearly show the wide fineness range of standard gradings which are maintained within narrow commercial limits.

Sieve Opening / Microns	B.S. 410 Sieve	PERCENT PASSING
		‘F’ 20 Micron	99% - 350 B.S.S.	99% - 300 B.S.S.	99% - 240 B.S.S.	99% - 200 B.S.S.	95% - 200 B.S.S.	90% - 200 B.S.S.	85% - 200 B.S.S.	80% - 200 B.S.S.	75% - 200 B.S.S.	70% - 200 B.S.S.
422	36											99.6
353	44											99.0
295	52											98.0
251	60									99.9	99.9	97.0
211	72							99.9	99.7	99.5	98.5	94.0
178	85							99.7	99.0	98.0	95.0	90.0
152	100						99.9	99.5	98.5	95.0	92.0	87.0
124	120					99.9	99.5	99.0	96.0	91.0	87.0	81.0
104	150				99.9	99.5	98.5	97.0	92.0	88.0	83.0	78.0
89	170				99.7	99.3	97.0	94.0	89.0	84.0	79.0	74.0
76	200			99.9	99.5	99.0	95.0	90.0	85.0	80.0	75.0	70.0
64	240		99.9	99.7	99.0	97.0	92.0	86.0	81.0	76.5	72.0	67.0
53	300	99.9	99.5	99.0	97.0	94.0	88.0	82.0	77.0	72.0	67.0	62.0
44	350	99.0	99.0	98.0	95.0	90.0	83.0	77.0	72.3	68.0	63.0	58.0
20		97.0	85.0	80.0	73.0	67.0	62.0	58.0	54.0	51.0	47.0	42.0
10		88.0	57.0	53.0	49.0	46.0	43.0	40.0	38.0	35.0	32.0	28.0
5		68.0	26.0	26.0	24.0	23.0	21.5	20.0	19.0	18.0	17.0	15.0
2		36.0	6.0	5.5	5.2	4.7	4.3	4.2	4.0	3.7	3.6	3.0

Please click on the picture above to enlarge

99-350, 99-300, 99-240, 99-200, 90-200, 85-200, 80-200, 75-200, 70-200.

Delabole Slate powder is used as a mineral filler, carrier, or surface dusting agent in the following products:

Bituminous Mixes • Asphaltic Floorings • Roofing Felts • Airfield Carpets • Bituminous Paints • Expansion Jointings • Damp-proof Courses • Pipe Protective Coatings • Mastics Fertilizers Filling Compounds Insecticides Paints & Printing Inks Pigmented Powders Plastics • Shellac based • Epoxy Resin based, and others Sealing Compounds Adhesives Rubber

A Powder & Granules brochure is available which includes more detailed information. Please select "LITERATURE" from the menu on the left to request brochures or click here.

FOR FURTHER INFORMATION, A PERSONAL QUOTATION OR TO PLACE AN ORDER,
PLEASE CONTACT OUR SALES TEAM VIA EMAIL (sales@delaboleslate.co.uk),
PHONE (01840 212242) or FAX (01840 212948)

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