R-EPS

Introduction, Characteristics, Applications of REPS Materials

REPS is a material subdivided in the field of foam packaging materials. It has moderate toughness and strength and can be used in packaging projects with higher requirements. Derived from PS modification,the material.properties are more diversified.production.The standard particle size ranges from approximately 0.8 to 1.2 mm, and customized production can also be carried out according to specific projects to achieve structural refinement or overall lightweighting. Representative project: Tray-type products with a particle size of 0.65– The independent design of REPS raw material production equipment enables multi-layered particle size 0.8 mm.

Food-grade packaging materials

Liquid crystal panel

Medical

Automobile

New energy

Mobile phones and tablets

Comparison of REPS Traditional EPS Production Processes

REPS physical performance data

Project	Performance	Test Method (Standard Followed)	Unit	Magnification
Project	Foaming Rate		Unit	20	25	30	40
1	Density	GB/T6343-2009	g/L	50	40	33	25
2	Compressive Strength（10% deformation）	GB/T8813-2020Method A	kPa	258	213	159	105
3	Compressive Strength（25% deformation）		kPa	301	252	194	130
4	Compressive Strength（50% deformation）		kPa	382	328	264	180
5	Compressive Strength（75% deformation）		kPa	664	588	495	327
6	Tear Strength	ASTMD624-00(2020)	kN/m	1.7	1.3	1.1	0.7
7	Flexural Strength	GB/T8812.1-2007	kPa	462	407	299	211
8	Flexural Stress (5%)		kPa	421	369	254	178
9	Flexural stress at maximum load		kPa	462	407	299	211
10	Flexural strain at break		%	7.7	7.6	8.6	9.8
11	Tensile Strength	ISO1926:2009	kPa	380	272	243	162
12	Puncture Resistance	ASTMF1306-21	N	67.7	48.3	39	26.8
13	Dimensional Stability23℃→(80℃)→23℃	ASTMD1710-15(Reapproved2021) Section 12.5	%	Length：0.43 Width： 0.29	Length：0.39 Width： 0.34	Length：0.38 Width： 0.37	Length：0.48 Width： 0.42
14	Dimensional Stability23℃→(-30℃)→23℃	ASTMD1710-15(Reapproved2021) Section 12.5	%	Length：0.10 Width： 0.10	Length：0.11 Width： 0.10	Length：0.11 Width： 0.12	Length：0.16 Width： 0.15
15	Water Vapor Transmission Rate	ASTME96/E96M-22aProcedureB	g/(m²·h)	0.309	0.523	0.56	0.575
16	Tensile Strength at Break	GB/T1040-2006	Kpa	558	548	440	265
17	Elongation at Break	GB/T1040-2006	mm	8.6	7.5	6.1	5.1
18	Poisson’s Ratio	ISO527-1-2019&ISO527-3-2018	μB	0.17	0.25	0.26	0.28
19	Tensile Modulus of Elasticity	ISO527-1-2019&ISO527-3-2018	Mpa	23.9	16.3	13.2	8.47
20	Compressive Modulus of Elasticity	ASTM-D1621	Kpa	9880	9216	6200	3135
21	Bead particle size	QB/T4009-2010	mm	0.76	0.76	0.76	0.76

Comparison between REPS and other foam materials

Project	REPS	EPO（PE+PSCopolymer）	EPS	EPP	EPE
Bubble structure	Independent closed cell	Independent closed cell	Independent closed cell	Independent closed cell	Independent closed cell
Mechanical strength	Medium	Medium	Brittle	Strongest	Medium、but soft
Maximum service temperature	85℃	80℃	85℃	110℃	80℃
Impact resistance	Good	Good	Bad	Superior	Superior
Toughness	Good	Good	Bad	Superior	Superior
Oil resistance and chemical resistance	Good	Good	Good	Superior	Superior
Water absorption rate	Low	Low	Low	Low	Medium
Recycling grade and difficulty of recycling	Level 6, equivalent to EPS	Difficult to recycle	Level 6	Level 5	Level 4
Compressive strength	Good	Good	Superior	Bad	Bad
Bending strength	Good	Good	Bad	Superior	Superior
Heat resistance	Medium	Medium	Medium	Superior	Bad
Weather resistance	Medium	Medium	Superior	Bad	Bad
Dimensional stability	Superior	Bad	Superior	Bad	Bad
Moisture resistance	Superior	Superior	Superior	Superior	Bad
Non – flaking performance	Superior	Superior	Bad	Superior	Superior
Density range g/l	22~50	20~40	5~50	20~60	30~60
Price	Medium	Relatively expensive	Cheap	Relatively expensive	Relatively expensive
Cost – performance evaluation	The performance is equivalent to that of EPS, but it has flexible applicability, a low unit price, and a significantly high comprehensive cost-performance ratio.	The process is fixed, the unit price is high, it is non-recyclable, and the acceptance degree of end customers is low.	It has a wide range of application fields and a low unit price, but its performance is generally for low performance packaging.	It has superior performance and a high unit price. It is generally recommended for packaging high-value products.	The performance advantages and disadvantages are polarized, the applicability is limited, and the cost is onthe high side.

Statistics of REPS production process

Manufacturer/Process flow	Item	YXC(16.0)GPO
Raw material	Material	Modified expandable polystyrene resin (GPO)
	Model specification	High-strength material (GPO)
	Supplier	Anhui Qiantai New Materials Co., Ltd.
Pre-expansion	Temperature	85°C±2°C
	Time	Pre – expansion cycle: 100 seconds – 200 seconds
	Density	Lid and bottom: 40 times
Curing	Time	4-8H
	Bin height	10 m
	Single silo full storage	450 molds
Molding	Steam pressure	0.55-0.85bar
	Steam heating time	Mold transfer heating time: 6±3 seconds.Fixed mold heating time: 6±3 seconds.Main heating time: 7±3 seconds.
	Mold water cooling time	1.0-5.0 seconds
	Vacuum stabilization time	50.0-90.0 seconds
Antistatic liquid	Manufacturer and model of electrostatic liquid	Guangzhou Jiamosen Environmental Protection Technology Co., Ltd.+SN/NMP-2208B/2218B
Antistatic liquid	Coating method	Spraying
Drying	Coating method	50C±5°C
Drying	Time	8H
Air-drying	Temperature and humidity	Indoor environmental temperature(0-40~C/20%–80%)
Air-drying	Time	24H

Comparison of advantages between REPS traditional materials

REPS products have excellent impact resistance and toughness. The original intention of their research anddevelopment was to optimize the use of traditional EPS in packaging material projects.

	REPS	EPS	Advantage Comparison
Masterbatch Process	Physical method	Chemical method	The physical method replaces the chemical method to reduce the emission of three wastes.
Product molding	Pre-foaming + Molding	Pre-foaming + Molding	The comprehensive energy consumption for molding is saved by more than 20%, and the comprehensive molding efficiency is increased by more than 50%.
Project Application	Flexible	Relatively fixed	Customized production can be carried out according to specific products, optimizing performance and particle size, and enriching colors.
Recycling	Recyclable	Difficult to recycle	It complies with the international PS recycling category 6, can be used for export projects, and can be recycled internally for re – granulation or downgraded treatment.
Cost	Localization	Import	Localized production offers obvious cost advantages.

REPS application case

Projects where REPS is applicable in the display industry: OC (TV), modules (MNT), tray plates (NB, TPC, OLED), etc., with actual testing and usage data.