Sand-blasted bars

Sand-blasted bars - manufactured by applying a sand-blasted finish to the pultrusion. 

Fig. 3. (A) SEM images of different positions (sand blasted (sb), 1, 4 and 9mm) and the according roughness value Ra on the roughness gradient. Morphology of rat calvarial osteoblasts (B) and human gingival fibroblasts (C) at different positions on the gradient. Cells were cultured for 7 days. The nucleus was stained with DAPI (blue) and the actin network with Alexa Fluor 488 phalloidin (green). Scale bar is 200 pm.

Abrasive blasting, both dry and wet processes, are effective on all substrates, but they require experienced mechanics to minimize damage to surfaces. Pressures used are usually between 20 and 110 Ib/in (140 and 760 bars), and working distances are from 3 to 12 in (7.6 to 30 cm). The abrasives are usually silica sand, but crushed slags and coal wastes are often used. The mesh sizes are very fine, either 0 or 00. Round particles are less abrasive and damaging than crushed grains. 

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