瀬戸内 List of Products and Services

The mountain sand for golf courses, "White Sand," is refined from weathered granite containing a lot of granite from the mountains of Daskoshi in Iwakuni City at our own factory, and has been developed for use as topdressing sand and base sand for turf. "Mountain sand" does not contain salt like sea sand, and organic matter and fine soil are carefully washed away, making it suitable for use in vegetation. "Mountain sand 2mm" is currently being used at various golf courses in the prefecture as sand for golf course turf and bunker sand. Since it is produced in different grain sizes, the particle size distribution is uniform, and it does not put a load on turf machinery, thus not reducing work efficiency. Additionally, due to its moderate water retention, it is also suitable as topdressing sand for turf during the peak summer season. We offer a lineup of 4mm, 2mm, and 1mm to suit various usage purposes. It is used for turf sand in soccer and baseball fields, sandboxes and ground leveling in schools and parks, as well as for plastering sand, among other applications. 【Mountain Sand Product Lineup】 ■ Sand 4mm ■ Sand 2mm ■ Sand 1mm ■ Fine sand (10mm, 6mm) *For more details, please download the PDF or feel free to contact us.

『山砂4mm』は、山砂は岩国市獺越(おそごえ)の山より採取した 風化花崗岩を多く含む真砂を自社製造工場にて精製しております。 海砂のような塩分を含まず、有機物や微粒土を丁寧に洗浄除去しているため、 非常にきれいな砂と好評を頂いております。 左官砂、建設用資材をはじめ、ゴルフ場・サッカー場・野球場の芝用砂、 学校や公園の砂場・グラウンド、お庭敷き砂、 自然薯などの耕作など 園芸用の砂としても使用されている無塩・無添加の砂です。 公共工事材料にも使用されており、材料試験表もございます。 また、品質に関する各種ご要望も承ります。 山砂4ｍｍの他にも、1ｍｍ、2ｍｍもご用意しております。 【規格】 ■主に2.4～0.6mm(4.35mm網) ■粗粒率2.97(R7年4月) ※詳しくはPDFをダウンロードしていただくか、お気軽にお問い合わせください。

"Yama-suna 2mm" is a fine sand composed of 70% medium grain and 20% fine grain, sourced from weathered granite in the Osogoe mountains of Iwakuni City, and refined at our own manufacturing facility. It does not contain salt like sea sand, and we carefully wash and remove organic matter and fine particles, resulting in very clean sand that has received high praise. This salt-free and additive-free sand is used for plastering sand, construction materials, as well as for golf courses, soccer fields, baseball fields, sandboxes in schools and parks, garden sand, and for cultivating natural yam. It is also used in public works materials, and we have material test reports available. Additionally, we welcome various requests regarding quality. In addition to 2mm Yama-suna, we also offer 4mm and 1mm options. It is also used in public works materials, and we have material test reports available. Additionally, we welcome various requests regarding quality. 【Specifications】 ■ Mainly 1.0–0.4mm (2.28mm mesh) ■ Coarse particle rate 2.56 (April of the 7th year of Reiwa) *For more details, please download the PDF or feel free to contact us.

『山砂4mm』は、微粒分少なく極めて細かい砂で、 山砂は岩国市獺越(おそごえ)の山より採取した 風化花崗岩を多く含む真砂を自社製造工場にて精製しております。 海砂のような塩分を含まず、有機物や微粒土を丁寧に洗浄除去しているため、 非常にきれいな砂と好評を頂いております。 左官砂、建設用資材をはじめ、インターロッキング目地、コンクリート2次製品の仕上用骨材、 挿し木培土、ゴルフ場グリーン芝用砂、サッカー場・野球場の芝用砂、 学校や公園の砂場・グラウンド、お庭敷き砂、 自然薯などの耕作など 園芸用の砂としても使用されている無塩・無添加の砂です。 公共工事材料にも使用されており、材料試験表もございます。 また、品質に関する各種ご要望も承ります。 山砂1ｍｍの他にも、4ｍｍ、2ｍｍもご用意しております。 公共工事材料にも使用されており、材料試験表もございます。 また、品質に関する各種ご要望も承ります。 【規格】 ■主に0.3mm(0.84mm網) ※詳しくはPDFをダウンロードしていただくか、お気軽にお問い合わせください。

We would like to introduce a case of delivering 2mm mountain sand to a certain golf club in Shunan City. "2mm mountain sand" is fine sand consisting of 70% medium grains and 20% fine grains. The mountain sand is refined at our own manufacturing plant and contains a high amount of weathered granite sourced from the mountains of Osogoe in Iwakuni City. It does not contain salt like sea sand, and because organic matter and fine particles are carefully washed away, it has received high praise for being very clean sand. This salt-free and additive-free sand is used not only as plastering sand and construction materials but also as sand for golf courses, soccer fields, and baseball fields, as well as for sandboxes in schools and parks, ground coverings, and gardening applications such as cultivating natural yam. 【Specifications】 ■ Mainly 1.0–0.4mm (2.28mm mesh) ■ Coarse particle rate 2.56 (April 2025)

Here is a case where 4mm mountain sand was delivered to a certain soccer field in the prefecture. Since the lines were drawn with lime, the field sand mixed with the lime and turned into a sticky mud, so we replaced it with "4.0 mountain sand" and paved it. It has been revived into a clean and solid field without foreign materials like shells, and it does not become sticky even when it rains, nor does it harden when dry, which has been greatly appreciated. 【Features of 2mm Mountain Sand】 It is a fine sand consisting of 70% medium grain and 20% fine grain, and the mountain sand is refined at our own manufacturing plant, containing a lot of weathered granite sourced from the mountains of Osogoe in Iwakuni City. It does not contain salt like sea sand, and because organic matter and fine soil are carefully washed and removed, it has received high praise as very clean sand. This salt-free and additive-free sand is used not only for plastering sand and construction materials but also as sand for golf courses, soccer fields, and baseball fields, as well as for sandpits in schools and parks, garden paving sand, and for cultivating natural yam. ■ Specifications - Mainly 1.0 to 0.4mm (2.28mm mesh) - Coarse particle rate 2.56 (April of the 7th year of Reiwa)

We would like to introduce a case where "4mm mountain sand" was delivered to the sand play area of S Kindergarten in Shimonoseki City. We received an inquiry stating, "The sand pit uses sea sand, which contains sharp shells and poses a danger for children playing barefoot. Does mountain sand contain shells?" In response, we replaced approximately 4.5m3 of sand with "4mm mountain sand." The children were able to play barefoot on the shell-free mountain sand right away. Additionally, for younger children, we recommend the finer "2mm mountain sand" and the pleasantly textured "1mm mountain sand." We encourage everyone to take off their shoes and play. 【Case Overview】 ■ Delivery Location: Sand play area of S Kindergarten in Shimonoseki City ■ Delivered Product: 4mm mountain sand ■ Product Features: No shells or foreign objects *For more details, please download the PDF or feel free to contact us.

We would like to introduce a case where "4mm mountain sand" was delivered to the sandpit at S Kindergarten in Shimonoseki City. The children are happily playing in the sandpit, and we deliver "mountain sand" every year. The principal mentioned, "The new students will be delighted." Even when left in a pile, the children climb and play on it, but we can also level it off upon request. 【Case Overview】 ■ Delivery Location: Sandpit at S Kindergarten in Shimonoseki City ■ Delivered Item: 4mm Mountain Sand ■ Work Details: Unloaded 3m3 with a 4-ton dump truck and then leveled it nicely. *For more details, please download the PDF or feel free to contact us.

We would like to introduce a case of delivering "2mm mountain sand" to Y Baseball Stadium in Iwakuni City. The sand was brought in for use as top dressing for the grass and for infield maintenance. It was unloaded using a 10-ton dump truck (7m3). "2mm mountain sand" is a product made from carefully selected masato soil that has been washed and screened, consisting of 70% medium sand and 20% fine sand. It is sourced from weathered granite containing a high amount of masato from the mountains in Takagoe, Iwakuni City, and is refined at our own manufacturing plant. [Case Overview] ■ Delivery Location: Y Baseball Stadium in Iwakuni City ■ Delivered Product: 2mm mountain sand ■ Work Details: Unloading with a 10-ton dump truck (7m3) *For more details, please download the PDF or feel free to contact us.

Here is an example of delivering "1mm mountain sand" as joint sand for interlocking. We used "4mm mountain sand" for the base and "1mm mountain sand" for the finish. It was leveled with a trowel and broom, and finally compacted with water, resulting in a completed surface. It easily fills the gaps of just a few millimeters. We received feedback saying, "It turned out beautifully." 【Case Overview】 ■ Delivery Location: Private residence ■ Delivered Materials: 1mm and 4mm mountain sand ■ Purpose: Interlocking joints *For more details, please download the PDF or feel free to contact us.

We would like to introduce a case where we delivered 250 bags of "2mm mountain sand" (15kg per bag) to K High School for ground leveling purposes. The delivery will be made by placing 50 bags on each pallet. We can deliver to locations where unloading can be done with a crane. "2mm mountain sand" is a product made from carefully selected sand that has been washed and screened, consisting of 70% medium sand and 20% fine sand. It is sourced from weathered granite found in the mountains of Iwakuni City, specifically from the Dako area, and is refined at our own manufacturing facility. [Case Overview] ■ Delivery Destination: K High School ■ Delivered Product: 2mm Mountain Sand ■ Purpose: Ground leveling *For more details, please download the PDF or feel free to contact us.

We would like to introduce the "Yamazuna (Mountain Sand) 2mm" available on our official online store. "Yamazuna" is sand that has been crushed, sorted, and washed from masato (a type of sand). "Yamazuna 2mm" is free of large particles and spreads evenly. It is suitable for lawn top dressing, turf sand, bunker sand, golf courses, baseball fields, soccer grounds, sandboxes, plastering, block joint mortar, vegetation, and cultivation (such as yam and natural yams, sand cultivation). 【Specifications (partial)】 ■ Raw material: Gravelly weathered granite (masato soil) ■ Origin: Iwakuni City, Yamaguchi Prefecture ■ Manufacturing method: Crushing, sorting, washing *May be wet due to natural dewatering ■ Color: Gray-beige *For more details, please download the PDF or feel free to contact us.

We would like to introduce "Yamazuna (Mountain Sand) 1mm," which is available on our official online store. "Yamazuna" is sand that has been crushed, sorted, and washed from Masago (fine sand). "Yamazuna 1mm" is a fine, smooth sand. It is suitable for sandboxes, lawn top dressing, finishing mortar, crafts, dioramas, sandblasting, sand art, mud ball polishing, interlocking joints, and more. 【Specifications (partial)】 ■ Raw material: Gravelly weathered granite (Masatsuchi) ■ Origin: Iwakuni City, Yamaguchi Prefecture ■ Manufacturing method: Crushing, sorting, washing *May be wet due to natural dewatering ■ Color: Gray-beige *For more details, please download the PDF or feel free to contact us.

In foundation work at construction sites, stable ground formation and long-term durability are required. In particular, when used in combination with cement or as backfill material, the quality of sand significantly affects the final outcome. The use of inappropriate sand can lead to insufficient strength, cracking, and even deterioration of structures. Our "Yamasuna 4mm" is free from salt and has been carefully refined to remove organic matter and fine soil, making it safe for use as construction material. 【Usage Scenarios】 - Foundation work at construction sites - Backfill material - General civil engineering work 【Benefits of Implementation】 - Stable ground formation - Improved long-term durability - Reduced impact on rebar