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TPE，是基于SEBS改性的。TPU，指的是熱塑性聚氨酯。TPE與TPU都屬于熱可塑性的具有橡膠彈性的材料,硬度接近的TPE和TPU材料，特別是黑色，都具有一定柔軟度和橡膠彈性，如僅靠肉眼觀察，有時(shí)還是很難分清是TPE還是TPU的。但從細(xì)節(jié)入手，還是可以從多方面來分析TPE與TPU的區(qū)別和差異。
1、硬度（范圍）的差異 基于SEBS改性的TPE具有廣泛可調(diào)整的硬度，其硬度范圍可以在Shore A Scale 0~100范圍變動(dòng)，而TPU硬度范圍則通常是在Shore 60A~Shore70D(目前國外出現(xiàn)硬度在45A左右的軟性TPU,不過價(jià)格相當(dāng)昂貴）。因此，可以說TPE的硬度區(qū)間是中低硬度，而TPU硬度則是中高硬度。
2、燃燒區(qū)分 TPE燃燒，氣味為特殊芳香味附帶石油氣味（石油味為PP組分燃燒氣味），火焰先端黃，火焰根部藍(lán)（超軟硬度TPE,火焰根部為黃色）。TPU燃燒則帶有一定的刺激性異味，燃燒時(shí)有茲茲的輕微爆炸聲。
3、性能差異 TPU的彈性及彈性恢復(fù)性能（耐屈撓抗蠕變性能）優(yōu)于TPE。主要是TPU的材料結(jié)構(gòu)為聚合物均相結(jié)構(gòu)，屬于聚合物樹脂類。而TPE則是多組分共混而成的多相結(jié)構(gòu)聚集的合金材料。高硬度的TPE加工容易發(fā)生制品變形，而在所有硬度區(qū)間范圍內(nèi)，TPU均表現(xiàn)出優(yōu)良的彈性，并且制品不易變形。
4、觸感上的差異 一些包覆成型的產(chǎn)品，如手柄、輪子,可能是TPE或TPU的。TPU材質(zhì)的產(chǎn)品，手感較為粗糙，摩擦阻力強(qiáng)；而TPE材質(zhì)產(chǎn)品，則手感比較細(xì)膩柔和，摩擦性能較弱。
綜上所述，TPE和TPU都屬于軟性材料，都具有良好的橡膠彈性。相比較而言,TPE在觸感的舒適度方面更為，TPU則更多的呈現(xiàn)優(yōu)異的彈性和強(qiáng)度。較低硬度的產(chǎn)品（如30A以下），需選用TPE,可以起到防滑緩沖減震回彈的效果。而對于較高硬度（80A以上）的要求彈性好的產(chǎn)品，用TPU才能勝任。TPE縮水率1.2~3%；TPU縮水率0.8~1.8%。
TPE is based on SEBS modification. TPU refers to thermoplastic polyurethane. TPE and TPU are rubber elastic materials with thermal plasticity. TPE and TPU materials with similar hardness, especially black, have certain softness and rubber elasticity. For example, it is difficult to distinguish TPE or TPU only by naked eyes. But starting from the details, we can analyze the differences between TPE and TPU from many aspects.
1. The difference of hardness (range) is based on the widely adjustable hardness of SEBS modified TPE. The hardness range of TPE can be changed from shore a scale 0 to 100, while the hardness range of TPU is usually from shore 60A to shore 70D (soft TPU with hardness of about 45A appears in foreign countries, but its price is quite expensive). Therefore, it can be said that the hardness range of TPE is medium to low hardness, while that of TPU is medium to high hardness.
2. TPE combustion is distinguished by combustion. The odor is special aromatic with petroleum odor (petroleum odor is the combustion odor of PP component), the flame tip is yellow, and the flame root is blue (super soft hardness TPE, and the flame root is yellow). TPU combustion has a certain irritating odor, and there is a slight explosion sound of zzz during combustion.
3. The elastic and elastic recovery properties of TPU are better than that of TPE. The main reason is that the material structure of TPU is polymer homogeneous structure, which belongs to polymer resin. TPE is a kind of alloy material with multi-component blending and multi-phase structure aggregation. High hardness TPE processing is prone to product deformation, and in all hardness ranges, TPU shows excellent elasticity, and the product is not easy to deformation.
4. Tactile differences some products, such as handles and wheels, may be TPE or TPU. TPU products have rough hand feel and strong friction resistance, while TPE products have delicate and soft hand feel and weak friction performance.
In conclusion, TPE and TPU are soft materials with good rubber elasticity. Compared with TPE, TPE is more excellent in tactile comfort, TPU is more excellent in elasticity and strength. For products with lower hardness (such as below 30a), TPE should be selected, which can play a role of antiskid, buffer, shock absorption and rebound. For products with high hardness (above 80A) and good elasticity, TPU is competent. The shrinkage of TPE is 1.2-3%, and that of TPU is 0.8-1.8%.
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