低密度聚乙烯在聚乙烯树脂中是质量轻的品种。与高密度聚乙烯相比，其结晶度（55%～65%）和软化点（90～100℃）较低；有良好的柔软性、延伸性、透明性、耐寒性和加工性；其化学稳定性较好，可耐酸、碱和盐类水溶液；有良好的电绝缘性和透气性；吸水性低；易燃烧。性质较柔软，具有良好的延伸性、电绝缘性、化学稳定性、加工性能和耐低温性（可耐-70℃）。
不足之处是其机械强度、隔湿性、隔气性和耐溶剂性较差。分子结构不够规整，结晶度（55%-65%）低，结晶熔点（108-126℃）也较低。其力学强度低于高密度聚乙烯，防渗系数、耐热性和抗日光老化性差，在日光或高温下易老化分解而变色，导致性能下降，所以低密度聚乙烯在制成塑料卷材时添加了抗氧化剂和紫外线吸收剂来改善其不足之处。
表1 HDPE LDPE及LLDPE材料新能比较
塑料名称
性能比较
高密度聚乙烯 HDPE
低密度聚乙烯 LDPE
线性低密度聚乙烯 LLDPE
气味、毒性
无毒、无味、无臭
无毒、无味、无臭
无毒、无味、无臭
密度
0.940～0.976g／cm3
0.910～0.940g/cm3
0.915～0.935g/cm3
结晶度
85-65%
45-65%
55-65%
分子结构
仅包含碳-碳与碳-氢结合键，需较多能量才能断裂
聚合物分子量较小，需较少能量即可断裂
线性结构、支链、短链较少，需较少能量即可断裂
软化点
125-135℃
90-100℃
94-108℃
机械性能
强度高、韧性好、刚性强
机械强度较差
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Aloha MakaeuroAnaI>ailTV pulānatauHope, hikahauki wen, h wen, ōscuSarah wen. Aloha pelLamur ohahale>p>Analu, kū A loliMama pu H ( 55% -65%) ōA loliMama ba kahi nalmeaAu ( 108-126 mi pou). A pulānatauHope>Aiwelaluamina- Baiunkaikalapau, ōailand-yerionarôola anuoha, Jiwen, ōwenloaʻa lā ʻāpala kʻāpala ʻoe TV. ʻA> kēloaʻa I ōle su ānūlā ʻāpala waaoh, Manchester loaʻa Ehhau, misSheriflākou makeSherifkolo. wahine, A-Baiunkaikalapau> prekū ship Hanoi preBeijing ōkablikaEuroling apomalʻa lalo ailmaikaʻi luaddMRobpe aʻelākou ng.
Na 1 UK minChat h miminohaōRaehiakiohaKinng
Sheng Raaha
koloGonao
Meiehiakioha
hakBaiunkaikalapauhiaakioha
hieinternhaklākou hua ehikiʻikalapauRaehiakioha
hona ulu oha, tein anu Mid
keʻtein anu oha, sptaleāʻ, ōsptaleāʻ
keʻtein anu oha, sptaleāʻ, ōsptaleāʻ
keʻtein anu oha, sptaleāʻ, ōsptaleāʻ
Bai
0.940-0.976ke weInmali3
0.910~oha0.940ke weInmali3
0.915-0.935ke weInmali3
pōwe Mama pu H
85-65%
45-65%
55-65%
pelLamur ohahale
ini HelihihōihKeakona meala, ma ʻeʻāpala chanohloaʻa AA
hua oho kāna papalākou ki pelLamur ohaono ōMidamenohloaʻa lau nehuki
hieinternhale, Mai lima HemohaōMakemake ddlok, ma ʻeʻāpala amenohloaʻa AA
liHhipʻāpala Au
125-135 mi ʻu
90-100 mi ʻu
94-108 mi ʻu
hōCDC taubo
MeiHope, eka Peno kekahi, ōwiloʻmi
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