We use polished 30 mm resin pucks for SEM and QEMSCAN analysis, made from rock, sand or drill cuttings.
The material is set in Struers low-viscosity EpoFix resin under high pressure. This forces the resin into the pore-space, enabling proper detection of pores.
After curing, the pucks are cut or ground to expose a suitable material surface and polished to a micron smooth surface. Carbon coating is applied before QEMSCAN analysis.
Core and outcrop rock samples are cut to size to fit in the puck mould. Resin is applied to the sample and subjected to high pressure to fill the pore space.
Once the resin has cured, the puck is cut to reveal a suitable interior surface. Note, please specify if you need the sample to be mounted in particular orientation.
Rocktype requires a minimum 10g of whole rock.
Wet cuttings are washed and dried before further preparation. Cuttings can be sieved to a certain particle size. The selected cuttings are then set in resin, ground and polished.
Sandstone cuttings can also be hand-picked under a stereo microscope to increase the sandstone abundance in the QEMSCAN data.
Rocktype requires 20g of dry and 50g of wet cuttings.
Heavy mineral separation
We can make heavy mineral separates from sand or solid rock.
Rocks are dis-aggregated to sand in a jaw crusher. Sand is sieved to the appropriate size fraction. Mixed sand is separated into light and heavy fractions using LST fastfloat heavy liquid with a density of 2.89 g/cc. The HM separates are cleaned and dried, ready for embedding in resin.
Rocktype requires 1g of heavy mineral separates for scanning. If you are sending us bulk rock, sand or cuttings for heavy mineral separation, we may need 100g or more to get enough separates to scan.
Sending us samples
Please send samples to:
87 Divinity Road
Note: To protect the QEMSCAN x-ray detectors we only scan resin pucks prepared with Struers Epofix resin. We cannot accept thin sections or other mounts prepared with different resin.
|Minimum sample quantity|
|Whole rock (core or outcrop)||10g|
|Heavy mineral separates||1g|
Sample preparation services
|Core store sample collection - Rocktype sample collection at the British Geological Survey. Includes day rate for one person, travel expense to BGS Keyworth, core store hire and return of samples and public data to BGS.|
|BGS sample charge - BGS standard rate per sample of £10, rebilled at cost.|
|Polished resin puck - Bulk sample photography, resin puck preparation, surface polishing and carbon coating. Includes cutting of bulk rock; washing, drying and sieving of cuttings as needed.|
|Cuttings handpicking - Manual selection of cuttings of specified lithotypes before resin puck preparation.|
|Heavy mineral separation - Concentration of heavy mineral grains for QEMSCAN analysis. Includes rock crushing and LST (heavy liquid) separation.|
|Single grain picking - Manual selection and mounting on double sided tape of 200 grains, such as zircon, garnet or rutile.|
Note: We do not offer small-batch sample preparation as a separate service from our QEMSCAN analysis. We can however prepare batches of 20 or more polished resin pucks.