HR-70 70℃ PVC Flame Retardant Flexible Sheath Compound

The HR-70 PVC Flame Retardant Compound is a specialized pelletized material designed for the extrusion of flexible cable sheathing. Engineered with a base of polyvinyl chloride resin and integrated with specific plasticizers and flame-retardant additives, this compound maintains a continuous service temperature of 70°C. The formulation is optimized to provide a balance between mechanical flexibility and thermal stability, ensuring the protective jacket remains intact under moderate thermal stress. HR-70 is processed as a masterbatch or ready-to-use compound, characterized by its consistent rheological properties, which facilitate smooth extrusion surfaces and stable dimensions during high-speed cable production. It complies with international safety standards regarding flame propagation, making it a functional component for low-voltage power and control cables.

HR-70 70°C PVC Flame Retardant Flexible Sheath Compound

Core Advantages

Thermal Resistance: Specifically formulated to withstand continuous operating environments up to 70°C without significant degradation of physical properties.

Flame Propagation Delay: The integrated chemical fire retardants effectively raise the Oxygen Index (OI), limiting the spread of fire along the cable run.

Extrusion Efficiency: Controlled particle size and melt flow index (MFI) allow for high-speed processing with minimal die drool or surface imperfections.

Flexibility Retention: High-purity plasticizers ensure the sheath remains flexible at room temperature, facilitating ease of installation in tight radii.

Product Characteristics

Technical Property

Testing Standard / Value

Tensile Strength

≥ 12.5 MPa

Elongation at Break

≥ 150%

Oxygen Index (OI)

≥ 28%

Specific Gravity

1.45 - 1.55 g/cm³

Brittleness Temperature

≤ -15°C

Application Scenarios

Low-Voltage Power Cables: Used as the outer sheath for residential and industrial wiring systems requiring flame retardancy.

Communication Wiring: Applied in internal data cables and telecommunication lines where flexible protection is necessary.

Appliance Wiring Material (AWM): Suitable for the external jacket of household appliance power cords and internal electronic leads.

Automotive Wiring: Utilized in secondary wiring harnesses that operate within the 70°C temperature threshold.

Storage and Handling Guidelines

Environment Requirements: Store in a cool, dry, and ventilated warehouse. Keep away from direct sunlight and heat sources to prevent premature aging or clumping of the pellets.

Moisture Control: While PVC is relatively moisture-resistant, it is recommended to pre-dry the material at 60°C to 70°C for 2 hours if the compound has been exposed to high humidity, ensuring a pore-free extrusion finish.

Safety Precautions: Ensure adequate local exhaust ventilation at the extrusion die to remove potential hydrogen chloride (HCl) vapors generated during high-temperature processing.

Shelf Life: Under standard storage conditions (Temperature < 35°C), the material maintains its specified technical properties for 12 months from the date of manufacture.

Flame retardant PVC sheath material for wire and cable is a granular material prepared by mixing, plasticizing and granulating with polyvinyl chloride resin as the base material and adding plasticizers, stabilizers, flame retardants and other additives.

Model, brand, name, implementation standard and use

Model	trademark	Maximum core operating temperature (°C)	name	Enforce the standard	use
ZH-70	7031	70	70°C PVC flame retardant soft layer plastic	GB/T8815-2008	Core working temperature 70°C flame retardant PVC wire and cable sheath plastic
HR-70	7032	70	70°C PVC flame retardant soft layer plastic		Core working temperature 70°C flame retardant PVC flexible wire and cable layer layer plastic
ZH -90	9031	90	90°C PVC flame retardant soft layer plastic		Core working temperature 90°C flame retardant PVC power cable sheath layer plastic

Note: The relative density index and color are determined by the supply and demand sides through negotiation

Mechanical, physical and electrical properties

Pilot project	unit	Standard value
Pilot project	unit	7031	7032	9031
Tensile strength	≥MPa	15.0	12.5	16.0
Tensile strain at break	≥%	180	200	180
Impact embrittlement temperature	≤℃	-25	-30	-20
Volume resistivity at 20°C	≥Ω.m	1.0 X10⁸	1.0 X10⁸	1.0 X10⁹
Dielectric strength	≥MV/m	18	18	18
Thermal deformation	≤%	50	65	40
200°C thermal settling time	≥min	50	60	80
Oxygen index	%	26~36	26~32	26~36
Heat-aging properties
Thermal aging temperature	℃	100±2	100±2	100±2
Thermal aging time	h	168	168	240
Tensile strength after aging The maximum rate of change in tensile strength	≥MPa	15.0	12.5	16.0
	≤%	±20	±20	±20
Tensile strain at break after aging The maximum rate of change of tensile strain at break	≤%	180	200	180
	≤%	±20	±20	±20
Loss of quality	≤g/m²	23	25	15

Processing technology

Processed by general extruder, L/D≥20, the recommended setting temperature of each extruder is as follows

Zone	District 1	2nd arrondissement	3rd arrondissement	4th arrondissement	5th arrondissement	Die head
Temperature °C	140	160	170	175	180	175

Marking, packaging, transportation and storage

Logo: The packaging bag should be marked with: the name of the manufacturer, product variety and model, batch number, color, manufacturing date, net weight, this standard number, and affix the color mark;

Packing: (25.0±0.2) kg bag, polyethylene film inner bag, woven bag or kraft paper composite bag outer packaging, or other packaging quality (weight) quantity negotiated by both supply and demand;

Transportation and storage: cable materials should not be exposed to the sun and rain during transportation, and should be stored in a clean, cool, dry and ventilated warehouse.

Coming From China, Marketing To The World.

Hangzhou Meilin New Material Technology Co., Ltd. was established in July 1994 (formerly known as Zhejiang Lin'an Hongyan Plastic Factory). The company has two factories located at 619 Linglongshan Road and 259 Xingyu Street, Lingqiu Street, Linglong Industrial Park, Lin'an District, Hangzhou City. The registered capital of the company is 75 million yuan, covering an area of over 18000 square meters and a building area of over 30000 square meters. Currently, modern industrial factories and 18 advanced automated production lines have been built. The new factory area will be produced in 2021, making it the cleanest and most beautiful professional cable material manufacturer in the entire region, agreement conditions.

We are Wholesale HR-70 70℃ PVC Flame Retardant Flexible Sheath Compound Suppliers and HR-70 70℃ PVC Flame Retardant Flexible Sheath Compound Factory.

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