UNIVERSITI TEKNIKAL MALAYSIA MELAKA

PERFORMANCE ANALYSIS ON THE EFFECTS OF FILLER

MATERIAL ON HDPE PLASTIC

This report submitted in accordance with requirement of the Universiti Teknikal

Malaysia Melaka (UTeM) for the Bachelor Degree of Manufacturing Engineering

(Manufacturing Process) (Hons.)

by

MUHAMMAD SYAZWAN BIN ROSIDI

B051210187

910905-14-6139

FACULTY OF MANUFACTURING ENGINEERING

2015

UNIVERSITI TEKNIKAL MALAYSIA MELAKA

BORANG PENGESAHAN STATUS LAPORAN PROJEK SARJANA MUDA

TAJUK: PERFORMANCE ANALYSIS ON THE EFFECTS OF FILLER MATERIAL ON HDPE PLASTIC

SESI PENGAJIAN: 2014/15 Semester 2 Saya MUHAMMAD SYAZWAN BIN ROSIDI mengaku membenarkan Laporan PSM ini disimpan di Perpustakaan Universiti Teknikal Malaysia Melaka (UTeM) dengan syarat-syarat kegunaan seperti berikut:

1. Laporan PSM adalah hak milik Universiti Teknikal Malaysia Melaka dan penulis. 2. Perpustakaan Universiti Teknikal Malaysia Melaka dibenarkan membuat salinan

untuk tujuan pengajian sahaja dengan izin penulis. 3. Perpustakaan dibenarkan membuat salinan laporan PSM ini sebagai bahan

pertukaran antara institusi pengajian tinggi.

4. **Sila tandakan ( )

SULIT

TERHAD

TIDAK TERHAD

(Mengandungi maklumat yang berdarjah keselamatan atau kepentingan Malaysia sebagaimana yang termaktub dalam AKTA RAHSIA RASMI 1972)

(Mengandungi maklumat TERHAD yang telah ditentukan oleh organisasi/badan di mana penyelidikan dijalankan)

Alamat Tetap:

No 199, Taman Desa Kamela,

05400 Alor Star,

Kedah Darul Aman.

Tarikh: ________________________

Disahkan oleh:

Cop Rasmi: Tarikh: _______________________

** Jika Laporan PSM ini SULIT atau TERHAD, sila lampirkan surat daripada pihak berkuasa/organisasi berkenaan dengan menyatakan sekali sebab dan tempoh laporan PSM ini perlu dikelaskan sebagai SULIT atau TERHAD.

DECLARATION

I hereby, declared this report entitled “Performance Analysis on The Effects of Filler

Material on HDPE Plastic” is the results of my own research except as cited in

references.

Signature : ……………………………………………..

Author’s Name : MUHAMMAD SYAZWAN BIN ROSIDI

Date : 2 July 2015

APPROVAL

This report is submitted to the Faculty of Manufacturing Engineering of UTeM as a

partial fulfillment of the requirements for the degree of Bachelor of Manufacturing

Engineering (Department of Manufacturing Process) (Hons.). The member of the

supervisory is as follow:

……………………………………….

(Dr. Raja Izamshah Bin Raja Abdullah)

i

ABSTRACT

There are many products that are already created by human to provide comfort

for users that comes in verity of uses. Plastics are inexpensive, lightweight and durable

materials, which are moulded-ready into a variety of products that has a wide range of

applications. As a consequence, the production of plastics has increased in market over

the last 60 years. However, current levels of their usage and disposal generate several

environmental problems. Recycling is one of the most important actions currently

available to reduce impacts and represents one of the most dynamic areas in the plastics

industry today. There are many products that already invented by using these plastic

recycle. The one possible application was HDPE wall tiles. There are few limitations or

defects on pure HDPE wall tile in terms of their properties. The ideas that the filler

materials are mixed with recycled HDPE plastic are generated to increase performance

and improve the properties such as hardness, water absorption and flammability. The

blends were processed by an internal mixture machine or Haake machine at 180oC

processing temperature. Then, the materials which have been mixed will be placed

inside the tiles mould of Hot Press Machine or Hot Isostatic Press Machine and melted

at a nominal set temperature of 210oC. The wall tile will be tested on flammability test

according to method of ASTM handbook. The flammability test was important because

the HDPE are flammable and to see if that when mixed with filler material, it will able

to reduce the flammability of wall tiles. Other than that, the testing for hardness and

water absorption was following the standard that provide by Malaysian Standards. The

Statistical Analysis shows that by using filler material of Silica sand give more effects

on the HDPE plastic.

ii

ABSTRAK

Terdapat banyak produk yang telah dicipta oleh manusia untuk memberi

keselesaan kepada pengguna yang datang dalam kejujuran kegunaan. Plastik adalah

murah, ringan dan tahan lama bahan-bahan, yang dibentuk-siap ke dalam pelbagai

produk yang mempunyai pelbagai aplikasi. Akibatnya, pengeluaran plastik telah

meningkat di pasaran sejak 60 tahun yang lalu. Walau bagaimanapun, tahap semasa

penggunaan dan pelupusan mereka menjana beberapa masalah alam sekitar. Kitar

semula adalah salah satu tindakan yang paling penting pada masa ini untuk

mengurangkan impak dan merupakan salah satu kawasan yang paling dinamik dalam

industri plastik hari ini. Terdapat banyak produk yang telah dicipta dengan

menggunakan ini kitar semula plastik. Satu aplikasi mungkin adalah jubin dinding

HDPE. Terdapat beberapa batasan atau kecacatan pada HDPE tulen jubin dinding dari

segi sifat-sifat mereka. Idea bahawa bahan-bahan pengisi dicampur dengan HDPE

plastik kitar semula yang dihasilkan untuk meningkatkan prestasi dan memperbaiki

sifat-sifat seperti kekerasan, penyerapan air dan terbakar. Campuran telah diproses oleh

mesin campuran dalaman atau mesin Haake pada suhu 180oC pemprosesan. Kemudian,

bahan-bahan yang telah dicampurkan akan diletakkan di dalam acuan jubin yang Hot

Mesin Tekan atau panas isostatic Press Mesin dan cair pada suhu set nominal 210oC.

Jubin dinding akan diuji pada ujian kemudahbakaran mengikut kaedah ASTM buku

panduan. Ujian kemudahbakaran adalah penting kerana HDPE yang mudah terbakar dan

untuk melihat apakah yang apabila dicampur dengan bahan pengisi, ia akan dapat

mengurangkan terbakar jubin dinding. Selain daripada itu, ujian untuk kekerasan dan

penyerapan air mematuhi standard yang disediakan oleh Standard Malaysia. Analisis

statistik menunjukkan bahawa dengan menggunakan bahan pengisi pasir Silika memberi

lebih kesan ke atas plastik HDPE itu.

iii

DEDICATION

First and foremost, this dedication is for my father and mother, who always pray for my

safety and health. Thanks to them because always be my side no matter what happen.

Without blessing from them, maybe I’m not here. All guidance and advice given by them

always I follow. For me, their prayer is key of my success. I am grateful because I have

them as my mother and father. Thank you

iv

ACKNOWLEDGEMENT

Alhamdulillah, all my praise to Allah S.W.T for the bless that been given to

complete Project Sarjana Muda (PSM) and successfully finished writing this report. I

wish to acknowledge and express my gratitude and appreciation to my supervisor, Mr

Dr. Raja Izamshah bin Raja Abdullah for his supervision, encouragement, suggestion

and assistance through the final year project study. Apart from that, I would like to

express my gratitude to Mr. Hairulhisham bin Rosnan as FKP technician that help and

guide me for doing the machine that used. I also would like to thanks to all peoples that

involved in giving help, guiding me in order to learn new thing and finish this final year

project. Moreover, I would like to thank the entire lecturer, FKP staff and friend that has

help me before and during final year project. I have been giving opportunity to carry out

a research, machining processing, experimental data, and using measurement equipment

which all of this things are really important to be learn in manufacturing industry.

v

TABLE OF CONTENT

Abstract i

Abstrak ii

Dedication iii

Acknowledgement iv

Table of Content v

List of Tables viii

List of Figures ix

List of Abbreviations, Symbols and Specialized Nomenclature xi

CHAPTER 1: INTRODUCTION 1

1.1 Overview of study 1

1.2 Background of study 2

1.3 Problem statement 5

1.4 Objective of study 6

1.5 Scope of study 7

CHAPTER 2: LITERATURE REVIEW 8

2.1 Introduction 8

2.2 High Density Polyethylene (HDPE) 9

2.2.1 Characteristics of HDPE plastic 9

2.2.1.1 Flammable 11

2.2.2 Mixing of High Density Polyethylene 11

2.3 Fire Retardant Material 13

2.3.1 Silica sand 14

2.3.1.1 Size Grading 15

2.3.2 Clay powder 15

2.3.3 Shell powder (Calcium Carbonate (CaCO3) 16

2.4 Processing of HDPE plastic 18

vi

2.4.1 Extrusion Machine 18

2.4.2 Internal Mixture Machine 19

2.4.3 Hot Press Machine 20

2.5 Product/Material Testing 21

2.5.1 Flammability Test 22

2.5.2 Water Absorption 23

2.5.3 Hardness Test 24

CHAPTER 3: METHODOLOGY 26

3.1 Research Flowchart 26

3.1.1 Project Planning 27

3.2 Research Materials 28

3.3 Experimental Procedure 31

3.4 Recycled HDPE Plastic Bottles Collection 33

3.5 Cleaning 33

3.6 Crushing 34

3.6.1 Crushing of Fire retardant material 35

3.7 Mixing Process 36

3.8 Hot Press Process 39

3.9 Material testing 40

CHAPTER 4: RESEULTS AND DISCUSSIONS 41

4.1 Results 41

4.1.1 Composition of the sample of mixed plastic and code names 41

4.1.1.1 The resulting sample weight during the mixing process 42

4.1.1.2 Sample of wall tile after mixing process 43

4.1.2 Water Absorption 47

4.1.2.1 Results for HDPE/Clay of wall tile 50

4.1.2.2 The Results for HDPE/Silica sand of wall tile 53

4.1.2.3 The Results for HDPE/Shell powder of wall tile 56

4.1.3 Hardness 59

vii

4.1.3.1 Result for HDPE/Clay of wall tile 62

4.1.3.2 Result for HDPE/Silica sand of wall tile 65

4.1.3.3 Result for HDPE/Shell powder of wall tile 68

4.1.4 Flammability 71

4.1.4.1 Result for flammability test 72

4.1.5 Optimize of Final Product/Sample 75

4.2 Discussions 77

CHAPTER 5: CONCLUSIONS AND RECOMMENDATIONS 82

5.1 Conclusions 82

5.2 Future work recommendations 83

REFERENCES 84

APPENDIX

A Gantt chart PSM I

B Gantt chart PSM II

viii

LIST OF TABLES

2.1 The properties of High Density Polyethylene (HDPE) 10

2.2 Size grading of silica sand 15

3.1 Total amount of wall tile with ratio of 60% HDPE and 40% Sand silica 30

3.2 Total amount of wall tile with ratio of 60% HDPE and 40% Clay 30

3.3 Total amount of wall tile with ratio of 60% HDPE and 40% Shell 30

4.1 Name of plastic samples and explanations 42

4.2 The weight of sample 42

4.3 The result of water absorption, % 49

4.4 ANOVA table 53

4.5 ANOVA table 55

4.6 ANOVA table 58

4.7 The result of hardness testing 61

4.8 ANOVA table 64

4.9 ANOVA table 67

4.10 ANOVA table 70

4.11 Burning characteristics of wall tile 73

4.12 The final sample 76

4.13 The comparison between the existing product and selected product 77

4.14 Mechanical Properties of HDPE-Silica sand composites 79

ix

LIST OF FIGURES

1.1 Pure HDPE Wall tile 2

1.2 Plastic waste 3

2.1 Mer structure of PE 10

2.2 Diagram Tensile Modulus versus Quantity Polystyrene 12

2.3 The example of silica sand 14

2.4 The sample of clay 16

2.5 Shell 17

2.6 Extrusion machine at FKP laboratory 19

2.7 Internal Mixture at FKP laboratory 20

2.8 Hot Press Machine at FKP laboratory 21

2.9 Heat release capacity, Flame resistance of commercial polymers and

Cost 22

2.10 Bunsen burner 23

2.11 ASTM D785 Rockwell Hardness Test 24

2.12 Shore Durometer 25

3.1 Research Flow chart 27

3.2 Recycled HDPE bottle 28

3.3 Digital Weighing Balance (DWB) 29

3.4 The overall processes (material preparation) 32

3.5 Recycled HDPE Plastic Bottles 33

3.6 Crushing Machine 34

3.7 Size of sample after crushing 34

3.8 Ball Mill Machine 35

3.9 The different size of particles of shell before and after using

Ball Mill machine 36

3.10 The amount of weight of both material 37

3.11 Mixing process of recycled HDPE with Fire retardant material

by using Internal Mixture 38

x

3.12 Hot Press Machine 39

4.1 HDPE 60%-40% Silica sand 43

4.2 HDPE 50%-50% Silica sand 43

4.3 HDPE 45%-55% Silica sand 44

4.4 HDPE 55%-45% Silica Sand 44

4.5 HDPE 50%-50% Clay 44

4.6 HDPE 45%-55% Clay 45

4.7 HDPE 60%-40% Clay 45

4.8 HDPE 55% - 45% Clay 46

4.9 HDPE 60%- 40% Shell powder 46

4.10 HDPE 50%- 50% Shell powder 46

4.11 100% HDPE 47

4.12 The sample immersed into a container 48

4.13 The different state after 14 days 48

4.14 The water absorption for all material composition 50

4.15 Effects of HDPE/Clay composition with water absorption 51

4.16 Effects of HDPE/Silica sand composition with water absorption 54

4.17 Effects of HDPE/Shell powder composition with water absorption 57

4.18 Shore Durometer 59

4.19 Type D (sharp 30o angle) 60

4.20 The hardness of all specimens 62

4.21 The Effects of HDPE/Clay composition with hardness 63

4.22 The Effects of HDPE/Silica sand composition with hardness 66

4.23 The Effects of HDPE/Shell powder composition with hardness 69

4.24 ASTM D-568 Flammability test 71

4.25 The Apparatus of flammability testing 72

4.26 The difference burning characteristics after flammability test 75

4.27 The example of container 80

xi

LIST OF ABBREVIATIONS, SYMBOLS AND

SPECIALIZED NOMENCLATURE

HDPE - High Density Polyethylene

SIRIM - Standards and Industrial Research Institute of Malaysia

FKP - Fakulti Kejureteraan Pembuatan

LDPE - Low Density Polyethylene

NFPA - National Fire Protection Association

PS - Polystyrene

CaCO3 - Calcium Carbonate

ATH - Alumina Trihydrate

NIST - National institute of Standards and Technology

UTeM - University Technical of Malaysia

DWB - Digital Weighing Balance

WA% - Water Absorption %

1

CHAPTER 1 INTRODUCTION

1.1 Overview of study

This section will explain the problem statement, project background, objective and scope

of the object. The title of this project is a performance analysis on the effects of filler

material on HDPE plastic. The one possible application was wall tile. The goal of this

project is to study of recycled plastic HDPE wall tile. High-density polyethylene (HDPE)

was one of the most commonly used plastics in the world. The HDPE plastic marked as

2, typically found in milk bottle or jugs, plastic bags and refillable plastic bottles.

Moreover, recycled HDPE plastic mostly it is used to manufacture lawn and garden

products, and automobile parts.

HDPE plastic has few properties that make it suitable as a packaging and manufacturing

product. It is extremely stronger than existing polyethylene, serves as a very effectively

against humidity and then remains solid at room temperature. It resists against rot and

other chemicals corrosion. It was easily recyclable and can be used for making a new

product again. Recycled HDPE creates no harmful extrication during its production or

during its usage by the user or consumer. Also, HDPE puncture no toxic chemicals into

the ground or water.

The existing wall tile is 100% pure HDPE. The HDPE plastics are flammable. So that,

many of product that made by HDPE cannot have longer life. This context actually will

happen when the product made by HDPE was burnt. Apart from that, the testing for the

wall tiles includes the water absorption and hardness. So that, to ensure that the wall tile

can be improved by using mixing method. The Figure 1.1 shows that the pure HDPE

wall tile.

2

Figure 1.1: Pure HDPE Wall tile

The type of input such as filler or additional material contains fire retardant element was

most important aspects to be considered in process of making HDPE product. The

parameter will be investigated during the process it will consider the filler material used

the ratio of mixed composition used and other.

1.2 Background of study

The idea of this project is actually come from the concept of tiles. In the modern era,

mostly houses are usually uses a used tile either in bathroom, hall room, kitchen and

other places. There are few types and characteristics of tiles that commonly used such as

ceramic tiles, homogeneous tile, glazed tiles, and rectified tile. The most tiles that used

by the people are ceramic tile or glazed ceramic. A existing tile could be a factory made

piece of hard and brittle material like ceramic, cement, stone, metal, or perhaps glass,

usually used for floors, covering roofs, walls, or alternative objects like tabletops

(Malaysian Standard, 1983). Ceramic tile was a mixture of clay and quartz ferrous sand

materials along with water. The special clays are mined from the earth, shaped, colored

and then fired in kilns. They can be colored and the surfaces can be glazed either in a

high gloss or matte finish. The ceramic tiles also have their disadvantage which is the

hardness. Hardness also can be measured by instrument. The hardness of ceramic tile are

lowest, if the high force is apply it will cracked (Malaysian Standard, 1981). The idea

3

that used by recycled plastic HDPE are generated. The recycle plastic HDPE wall tiles

are eco-friendly option. Other than that, plastic also have a defect such as flammable.

According to D.McEvoy (2008), producing plastic has a world environmental impact

because it uses many fossil fuels. There are about 3 million tons of plastic waste each

year that create by people in the world. The Government agency reports that around 80%

of plastic waste is reaching landfill sites. This is a primary problem cause for land fill

sites increasing and environmental impact. The possible solution is to reuse or recycle

the plastic that has already been produced. In fact, recycling plastic has many benefits

such as reducing consumption of energy and nonrenewable fossil fuels use.

Figure 1.2: Plastic waste (Masni, 2009)

According to Fletcher and Mackay (2002), proposes a new method of plastics recycling

for reduce the amount of plastic waste. They prove that recycling plastic can lessen the

quantity of waste to landfill. From that, the new plastics are produce by calling it as

thermoplastic polymers. Figure 1.2 shows that the plastic waste found in landfill.

Callister (2003), stated that thermoplastic become soft and easily formed when heating.

There a few common examples of thermoplastic such as polypropylene, polyethylene,

polyvinyl chloride, polycarbonate and many others. All these particular plastic have their

own properties such as fabric, films and packaging materials

4

A recycled plastic manufacturer produces various product plastic tiles for use in

construction or houses. They create a new product from recycled high density

polyethylene (HDPE) for improve quality of product and also reduce in terms of cost.

Certainly, HDPE is a thermoplastic that is easily reused or recycled and easily being

formed. Some primary properties of these thermoplastics are can use in highly

temperature range and it is also stronger, impact and temperature resistance and has an

optical properties. Unfortunately, these thermoplastics are one of the expensive plastic in

the world. That is why it needs to be recycled. A main issue is that mixture of different

type of material has giving high effect on HDPE plastic properties such as hardness,

water absorption, flammability, etc.

Shriver et al, (2010) stated that the amount of plastics recycled was mixed excessively

for making a products, it can improve and increase mechanical properties such as impact

and tensile strength. The amounts of mixture materials or components to produce

recycled plastic products must also be considered.

Gou et al, (2001) stated that the number amounts of mixture material or components to

produce plastic recycled products can be defined or determined. Mixing experimental

method is one of the most accurate and possible techniques for studying the effect of

mixture components on overall characteristics. This method is applied to any kind of

materials such as silica sand, clay powder and shell powder (CaCO3 calcium carbonate).

To determine the number amounts of mixture material or components to produce HDPE

plastic wall tiles, response surface methodology with mixture experiment was employed.

This research will apply or used the experiment of mixture method.

The Hot Press machine is used to make a recycled HDPE plastic wall tiles. In a hot press

machine, a die is mounted and then be heated, with the products pressed by using the

prescribed pressure. The molten material with temperature and time set in the mold used

and the specific pressure control The Hot Press process itself was uncontaminated

because the materials that used are in dry conditions. In this case, the recycle HDPE

plastic mixed with other material and melt into mould by heating element using Haake

internal mixture machine.

5

1.3 Problem Statement

On 16th century, the tile was used for decorative building and most of wall tile made by

ceramic (Malaysian Standard, 1981). To develop the ceramic tile requires very high

costs and it is brittle (Malaysian Standard, 1983). The solutions purposed was change the

materials and replace with recycled HDPE plastic. The problem faced by many

thermoplastics such as polyethylene, polypropylene, polyvinyl chloride and

polycarbonate products was the material are often flammable (Hilado, 1998). The

material need mixed by a fire retardant agent to resist heat (Frank Pitts, 2000). For this

research, the recycled high density polyethylene (HDPE) plastics are being chosen for

make a wall tiles. Thus, it also will become main research for doing flammability,

hardness and water absorption test. The flammability test will be performed as followed

by standards provide by ASTM Handbook and Malaysian Standard. The problem also

needs to identify the best filler material such as natural fiber material like clay powder

for mixed with the recycle HDPE plastic. It will be tough because it must be ensured that

the filler material are matched and can produce the wall tiles after be compressed with

hot press machine. Last but not least, the research also needs to suggest the suitable ratio

for combining both materials that used. The research also needs to know their hardness

and water absorption result for develop a good quality of wall tiles. The hardness test

and water absorption is tests that provide by Malaysian Standard and also established by

SIRIM.

6

1.4 Objective of study

The objectives of this study are:

1. To investigate the performances namely hardness, water absorption and

flammability of filler material on HDPE plastic.

2. To analyze the performances on different filler material composition ratio.

3. To choose the best filler material type and composition ratio for specific application.

7

1.5 Scope of Study

The project studies for this final year project only cover one station in FKP laboratory.

In this study mostly used the hot press machine at laboratory. Other than that, the

machine that used for mixed both materials is Internal Mixture or Haake machine.

Meanwhile, for crushing the filler material and recycled HDPE plastic bottle it will use

the crushing machine available at FKP laboratory. Apart from that, the machine that

used for crush a filler material into tiny particle or powder is Ball Mill Machine. The

studies also need to find out the best filler material involve for producing a recycle

HDPE plastic wall tiles. The factor involves the ratio of composition of filler material

with HDPE plastic recycle. The project also needs to find out the result of flammability,

water absorption and hardness of product.

8

CHAPTER 2 LITERATURE REVIEW

2.1 Introduction

This chapter describe about the source and the history of the research that had been done

by other that related to my research. The project study will highlight the detail about the

process and quality tool that might be used to identify and problem solving in order to

carry out an efficient improvement product of recycled plastic HDPE wall tiles. The

explanation is aided with the literature concept and improvement method implemented

by past researcher. The knowledge applied from other expertise literature is significant

to produce a valid support for the project study to be referenced for other people in the

future. The research carried out in the past has been fully approved by professional

organization and the knowledge is valid to become a reference for preliminary stage for

student to come out with their own article and journal in the future.

The chapter will outline some aspect need to consider in producing a fire resistance of

recycled plastic HDPE wall tiles. The literature concept also needs to know about the

characteristics and properties of HDPE plastic. It also summarized a several type of fire

retardant material selected that will be a major parameter need to consider. Apart from

that, the processes of mixing the material need to describe properly that include the ratio

of combination material.

9

2.2 High Density Polyethylene (HDPE)

Muller (2007), stated HDPE is a discovery began in 1951 by J. Paul Hogan and Robert L

Banks. Both researchers are exploring ways to convert the properties of ethylene and

propylene, a hydrocarbon produced when burning natural gas. In the process, they

discovered a catalyst that can convert these products into a solid polymer, plastic

produced is crystalline polypropylene and high-density.

Plastic revenue impact extends to the use of plastic products. At present, most of the

sectors that have been used plastic for producing a product. Among these is the use of

plastic like bottles, containers of liquid filling materials and items of daily use.

Koerner (1992), stated thermal plastic material is viscoelastic, that means the properties

such as mechanical properties is reflect on the viscous liquid and an stretchy solid at

once. But when elastic stresses are imposed, it shows the action of dissipate energy

means that the materials are viscous flow and the elastic displacement (ie stored energy).

The properties of elastic materials depend on the temperature, time and rate of

deformation. However, stress and strain testing usually be used as to determine

mechanical properties of plastics.

2.2.1 Characteristics of HDPE plastic

Muller (2007), stated that HDPE plastic made by petroleum. To make one kilogram of

HDPE, the petroleum need have around 1.75 kilograms. It has tensile strength and

intermolecular forces higher than low density polyethylene (LDPE). In addition, the

HDPE is also more robust and can withstand temperatures of at the point (120oC / 248oF

in the short term and, 110oC / 230oF for prolonged. the density that produce by HDPE is

around range between 0.935-0.965 g/cm3 and also highly crystalline compared to LDPE.

HDPE slightly quite expensive but in terms of properties, it more stiffer and stronger.