Overview

CPP (Polypropylene) shares many properties with PE (Polyethylene), but it outperforms PE in terms of stress cracking resistance, transparency, and tensile strength.

Characteristics

• Lightweight Property
  Falls under the category of plastics with the lowest specific gravity.
• Unique PP Hinge Property
  Possesses excellent “hinge property,” meaning it resists repeated bending.
• Food Safety
  Compliant with food hygiene regulations.
• Resistant to Stress Cracking
• Excellent Surface Appearance
  Glossy surface and relatively scratch-resistant.

Applications

Automotive parts, home electrical components, tableware, household items, stationery, office supplies, medical containers, containers and miscellaneous goods, food packaging films, textile materials, flat yarns.

Specifications

– PP Sheets

PP	Color	Thickness(T)
	White	2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100
	Sage Green	5, 10, 15, 20

-PP Rods

PP Rods	Color	Diameter (Φ)
	White	10, 12, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 250, 300

Technical Data

The most notable feature of PP is its resistance to repeated bending, making it ideal for producing hinges (joint components).
Compared to PE, it is more vulnerable to impact and UV radiation at low temperatures.

Classification

Category	Property	Unit	Test Method (ASTM)	PP	HDPE
Mechanical Properties	Tensile Yield Strength	kg/cm²	D638	330	250
	Tensile Breaking Strength	kg/cm²	D638	310
	Elongation at Break	%	D638	>5100	800
	Flexural Modulus	kg/cm²	D790	17000	11000
	Surface Hardness	Rockwell	D785	R100	D65
	Impact Strength (Notched)	kg.cm/cm notch	D256	3.8	20
	Abrasion Resistance	mg/1000 cycles	D1044	40
Physical Properties	Specific Gravity			0.91	0.96
	Linear Expansion Coefficient	x10-5/		11	11
	Thermal Conductivity	kcal/M.Hr.℃		0.12	0.21
	Water Absorption (24 Hr in Water)	%	D570	<0.01	<0.01
	Specific Heat	kcal/M.Hr.℃		0.46	0.55
	Continuous Use Temperature	℃		65
	Flammability		D635	1.9~2.1	2.5~2.6