1. Materials Stability and Durability
EPDM is a synthetic rubber material designed for decades of outdoor exposure to the elements and inert to the effects of buried environments containing microorganisms.
Bentonites are hydrated aluminosilicate minerals, comprised chiefly of montmorillonite, inorganic substance, one of characteristics is cation exchange which is easily subjective to reaction with the microorganisms.
2. The Waterproofing Principles
EPDM is imperious to water itself, be of excellent waterproofing performance, it can bear high water pressure.
Sodium bentonite expands when wet, possibly absorbing several times its dry mass. Sodium Bentonite usually is "sandwiched" between synthetic materials to create GCL for waterproofing .Permeable to water itself, it needs rely on the substrate and cover layer to provide the confined force and space to fulfill the requirement. In practical project the product without HDPE can’t apply in the high water pressure condition.
3. Onsite Transportation Convenience
EPDM is relatively light, 1.25kg per square meter(1.02mm thick), easily and convenient to onsite transport and install.
The weight of the bentonite is very heavy, around 5kg per square meter, and not convenient to transport and install.
4. Field Condition Demanding
EPDM can be applied on the soft substrate, for instance sands, and exposed to use.
The bentonite need to provide the enough limited force to make itself work .there must be covering layer to make it work. The substrate and the covering layer must be flat and compact, and the covering layer could be 300mm thick compacted soil or 100mm thick cast-in-situ concrete.
5. Root Resistance
EPDM can resist the small aquatic plants penetration.
Bentonite can’t resist any plants penetration.
6. Alkaline Water Application
EPDM doesn’t react with the alkaline water for instance, sea water, which make it possible for this field’s application.
The sea water will resist the Bentonite’s expansion which makes it fail in this field.
三元乙丙卷材与膨润土防水毯对比分析
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三元乙丙卷材
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膨润土防水毯
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三元乙丙材料本身防水，具有极佳的防水性能，能够承受高水压；完全可以暴露在自然条件下使用。
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材料本身不防水，它需要基层和覆盖层提供足够的局限力和有限的空间来满足防水要求，遇水以后形成一层不透水膜；实际项目中不贴HDPE膜的膨润土防水毯不能应用在大于2米的水压条件；
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凡士通三元乙丙卷材断裂延伸率大于450%，柔韧性很好，能够适应结构应力产生的形变防止破坏；
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膨润土防水毯断裂延伸率仅仅是30%，适应结构应力下的变形相对较弱；
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凡士通三元乙丙本身分子结构很稳定性能够应用在海水以及轻度污染的防水防渗项目中；
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目前普通膨润土防水毯不能应用在海水中以及污染水中；
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防水性能优异并且由于凡士通三元乙丙卷材化学分子结构很稳定，它的寿命可以与建筑主体相同；
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天然钠基膨润土防水毯比人工钠化膨润土防水毯更稳定；在国内大多数膨润土基本采用是人工钠化的膨润土防水毯，稳定性是主要问题；
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凡士通三元乙丙防水系统拥有成熟的辅材体以及施工应用体系；利用成熟的凡士通特有的丁基橡胶“快接Quickseam tape“搭接带能够保证搭接缝部位滴水不漏，针对不同情况下不同的施工方法也确保防水效果优异；
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膨润土防水毯辅材体系是不完善的；较好的膨润土生产厂家在搭接缝部位采用膨润土防水浆和膨润土防水粉作为辅材密封；而大多数厂家采用人工钠化的膨润土防水粉作为搭接缝的密封材料将导致防水失败 ；
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三元乙丙卷材相对较轻， 1.25㎏/㎡;方便施工操作；
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膨润土防水毯很重，5㎏/㎡.人工施工很困难，尤其在较小的工作面内；
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凡士通三元乙丙卷材优异主材以及辅材质量以及针对性的施工工法共同组成防水体系大大降低了防水失败的可能性；
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膨润土防水毯的防水原理是在局限力和局限空间下膨润土遇水以后形成一层胶质的不透水膜；防水成功的因素较多；主材和辅材的质量，足够的局限力和有限的空间；任何一项产生问题都将导致防水失败 ；
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