3:30 PM - 5:00 PM
[MZZ43-P13] Method statement for backing material of formation surface peel specimens by XPS
Keywords:surface peel specimens, Extruded Polystyrene Foam(XPS), silicone sealant
XPS (Extruded Polystyrene Foam) is an architectural material use for insulation purpose. It is made from extruded polystyrene foam and flame retardant. Alternate name are Styrofoam, Mirafoam, or Kanelite foam. This material can found in most hardware stores. XPS is about 1/15 weight of plywood while costing about 1/4 to 1/2 less. This material also has the lowest formaldehyde emission ranking (F four stars), hence it has no usage restrictions.
The first step of the sampling method for surface peeling is to apply glue to the exposure layer and paste a cheesecloth or glass fiver cloth over it. Once the glue has dried, peel off the cheesecloth along with the formation sample. (As an example, this method from exhibition catalogue of Kanagawa Prefectural Museum Natural History 2008)
The type of glue used for sampling method are Tomack NS-10(SANKO-SYOJI Co.,Ltd) and HYCEL HO-1AX(TOHO Chemical Industry Co.,Ltd), these product are readily available off the shelf, hence it is easily accessible by museum curators and teachers. Alternatively, there are many other methods on display. One example at Kanagawa Prefectural Museum of Natural History, uses a 3 * 6 plywood (5.5mm to 9mm thick) with 60mm to 90mm square timber as frame. Tipically, formation samples are secure to this board by a coarse thread (from special exhibition "Strip the earth" of Kanagawa Prefectural Museum Natural History 2017). This frame board is able to withstand heavy samples such as a gravel bed. Lightweight samples such as tephra are also available, in cases where the backing material is also lightweight. This makes it easier for handling, display and storage purpose. Our presentation is proposal for weight reduction of formation samples and practice report from one of Geopark site base in Hakone Geomuseum.
Hakone Geomuseum was opened in 2014 and established by Hakone town, which was our previous working place. When the Geomuseum started, our exhibition mainly consisted of video displays but it was often damaged by volcanic gas which pushed us to change our exhibition. As part of exhibition change, tephra formation sampling started in 2020 using Tomack NS-10 and cheesecloths. After we sampled, we made backing out of XPS. The formation sample is Set on gypsum board wall. The XPS used 25 mm thick and weights 1.5kg(910 mm *1820 mm). The formation sample was mounted on XPS using silicone sealant, which is cheap, effective and easy to use, being flexible enough to maneuver around uneven shapes and is even available in a variety of colors. The silicone sealant is applied using a caulking gun, line by line or in spots. The amount of sealant used is 3 tubes (990 ml) for 3*6(910 mm *1820 mm). Additional materials used are two 20 mm*40 mm timber as supporting legs and hanging screw eyes.
In addition, XPS has allowed us to display formation sample as indeterminate forms.
So far we have tried to get a rectangle sample on site. But in situ sample is indeterminate due to the exposure being of indeterminate shape. Generally, after taking a sample it is cut as a rectangle shape following the shape of the frame board. However, since XPS is easy to cut using a cutter knife or a hot wire cutter, it is easy to follow the indeterminate shape of an in situ sample. The visual impression of an indeterminate shape has so much presence compare to that of a rectangle one. At the Hakone Geomuseum, all of the formation sample displays are of indeterminate shapes. Note that we have made Byakubi Ash formation sample at Ontakesan Visitor Center (Kiso Town, Nagano Pref.) by this method.
The first step of the sampling method for surface peeling is to apply glue to the exposure layer and paste a cheesecloth or glass fiver cloth over it. Once the glue has dried, peel off the cheesecloth along with the formation sample. (As an example, this method from exhibition catalogue of Kanagawa Prefectural Museum Natural History 2008)
The type of glue used for sampling method are Tomack NS-10(SANKO-SYOJI Co.,Ltd) and HYCEL HO-1AX(TOHO Chemical Industry Co.,Ltd), these product are readily available off the shelf, hence it is easily accessible by museum curators and teachers. Alternatively, there are many other methods on display. One example at Kanagawa Prefectural Museum of Natural History, uses a 3 * 6 plywood (5.5mm to 9mm thick) with 60mm to 90mm square timber as frame. Tipically, formation samples are secure to this board by a coarse thread (from special exhibition "Strip the earth" of Kanagawa Prefectural Museum Natural History 2017). This frame board is able to withstand heavy samples such as a gravel bed. Lightweight samples such as tephra are also available, in cases where the backing material is also lightweight. This makes it easier for handling, display and storage purpose. Our presentation is proposal for weight reduction of formation samples and practice report from one of Geopark site base in Hakone Geomuseum.
Hakone Geomuseum was opened in 2014 and established by Hakone town, which was our previous working place. When the Geomuseum started, our exhibition mainly consisted of video displays but it was often damaged by volcanic gas which pushed us to change our exhibition. As part of exhibition change, tephra formation sampling started in 2020 using Tomack NS-10 and cheesecloths. After we sampled, we made backing out of XPS. The formation sample is Set on gypsum board wall. The XPS used 25 mm thick and weights 1.5kg(910 mm *1820 mm). The formation sample was mounted on XPS using silicone sealant, which is cheap, effective and easy to use, being flexible enough to maneuver around uneven shapes and is even available in a variety of colors. The silicone sealant is applied using a caulking gun, line by line or in spots. The amount of sealant used is 3 tubes (990 ml) for 3*6(910 mm *1820 mm). Additional materials used are two 20 mm*40 mm timber as supporting legs and hanging screw eyes.
In addition, XPS has allowed us to display formation sample as indeterminate forms.
So far we have tried to get a rectangle sample on site. But in situ sample is indeterminate due to the exposure being of indeterminate shape. Generally, after taking a sample it is cut as a rectangle shape following the shape of the frame board. However, since XPS is easy to cut using a cutter knife or a hot wire cutter, it is easy to follow the indeterminate shape of an in situ sample. The visual impression of an indeterminate shape has so much presence compare to that of a rectangle one. At the Hakone Geomuseum, all of the formation sample displays are of indeterminate shapes. Note that we have made Byakubi Ash formation sample at Ontakesan Visitor Center (Kiso Town, Nagano Pref.) by this method.