{"id":49896,"date":"2024-02-20T15:08:41","date_gmt":"2024-02-20T06:08:41","guid":{"rendered":"https:\/\/www.taiyokogyo.co.jp\/products\/49896\/"},"modified":"2025-12-12T20:11:57","modified_gmt":"2025-12-12T11:11:57","slug":"high-density-polyethylene-sheet-gundel-sheet-hd-series","status":"publish","type":"products","link":"https:\/\/www.taiyokogyo.co.jp\/en\/products\/49896\/","title":{"rendered":"“Gundle Sheet HD”-High Density Polyethylene sheet-"},"content":{"rendered":"\n
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Product & Service<\/h2>\n\n\n\n
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Product Lineup<\/h3>\n\n\n\n
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Gundle Sheet HD<\/h4>\n\n\n\n

This is the most standard high-density polyethylene (HDPE) sheet. HDPE has excellent tensile strength and chemical resistance, and is highly elastic (spring-like in its ability to return to its original shape when force is applied). Its wide width reduces on-site joints, contributing to quality and construction time.<\/p>\n\n\n\n

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Gundel Sheet HD Product Catalog<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Gundle Sheet HDW<\/h4>\n\n\n\n

This is a high-density polyethylene (HDPE) sheet with a white layer on the surface. The white layer reflects sunlight and prevents the sheet from rising in temperature, thereby reducing expansion and contraction of the sheet due to temperature changes. The white layer also makes it easier to see minor damage.<\/p>\n\n\n\n

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Gundel Sheet HDW Product Catalog<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Gundle Sheet HDCW<\/h4>\n\n\n\n

The most important factor in constructing a leak-free impervious sheet is a reliable watertightness inspection. The Gundel Sheet HDC Series has a conductive layer on the reverse side, which enables damage to be checked by a spark inspection machine. It is possible to electrically inspect for damage in areas where watertightness inspections have been difficult in the past.<\/p>\n\n\n\n

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Gundel Sheet HDCW Product Catalog<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Gundle Sheet HDF<\/h4>\n\n\n\n

This is a \u201chigh-friction (rough surface) sheet\u201d with polyethylene particles dispersed on the surface of the high-density polyethylene sheet to create a \u201crough\u201d surface. In areas where overburden loads are generated, if the interlayer frictional resistance of the impervious layer is low, tension is generated in the impervious sheet. In such locations, the use of \u201chigh friction type (rough surface) sheets\u201d can reduce the stress on the impervious sheets by increasing the frictional resistance between the impervious layers.<\/p>\n\n\n\n

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Gundel Sheet HDF Product Catalog<\/a><\/div>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
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Method of joining impervious sheets<\/h3>\n\n\n\n
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Self-propelled welding situation<\/h4>\n\n\n\n

Self-propelled fusion bonding machines are mainly used to fuse impervious sheets. Pressure is applied while the sheets are heated by a hot plate or hot air to unify overlapping sheets.<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n

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Pressure test status<\/h4>\n\n\n\n

The watertightness of the joint is inspected by applying pressure to a predetermined value through the inspection hole in the center of two rows of joints (double seam method) and measuring the amount of pressure reduction.<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n

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Extrusion welding status<\/h4>\n\n\n\n

Extrusion welding is used for joints that are difficult to install with a self-propelled fusion splicer. Using a dedicated welding machine, cuttings of the same material as the impervious sheet are melted and integrated with the sheet.<\/p>\n<\/div><\/div>\n<\/div>\n\n\n\n

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standard value<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n
item<\/th>\nLow elasticity type<\/th>\nMedium elastic type<\/th>\nHigh elasticity type<\/th>\nTest procedure<\/th>\n<\/tr>\n
Thickness (mm)<\/td>\n1.5<\/td>\n1.5<\/td>\n1.5<\/td>\nJIS K 6250 compliant<\/td>\n<\/tr>\n
Tensile performance<\/td>\nTensile strength (N\/cm or more)<\/td>\n120<\/td>\n140<\/td>\n350<\/td>\nJIS K 6251 compliant<\/td>\n<\/tr>\n
Growth rate (% or more)<\/td>\n280<\/td>\n400<\/td>\n560<\/td>\n<\/tr>\n
Tear performance<\/td>\nTearing strength (N min.)<\/td>\n40<\/td>\n70<\/td>\n140<\/td>\nJIS K 6252 compliant<\/td>\n<\/tr>\n
Joint Strength Performance<\/td>\nTear performance<\/td>\n60<\/td>\n80<\/td>\n160<\/td>\nJIS K 6008 compliant<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div><\/div>\n\n\n\n
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Usage<\/h3>\n\n\n\n