UNP Polyvalves | Manufacturer of PFA/FEP/PTFE Lined & Plastic Valves, Pipes & Pipe Fittings

	Property	Specification(ASTM)	Unit	Material
				Normal Grade PP	Isotactic PP	PFA	FEP	ETFE	PVDF
General	Continuous service temperature	Maximum	°C			260	200	150	150
	Continuous service temperature	Maximum	° F			500	392	302	302
	Chemical resistance		-			Excellent	Excellent	Excellent	Good
	Specific gravity	D 792	-			2.15	2.15	1.73	1.78

Electrical	Dielectric constant	D 150 at 103 Hz	-			2.1	2.1	2.6	7.2
	Dielectric constant	D 150 at 106 Hz	-			2.1	2.1	2.6	8.5
	Dielectric dissipation factor	D 150 at 103 Hz	-			0.0002	0.0001	0.0008	0.030
	Dielectric dissipation factor	D 150 at 106 Hz	-			0.0003	0.0008	0.005	9 x 10-2
	Dielectric strength (short term) 10 mils film	D 149	Volt/mil			2 000	2 000	2 000	1 600
	Volume resistivity	D 257	Ohm•cm			>1018	>1018	>1016	>1014

Environmental	Water absorption	D 570	%			< 0.03	< 0.01	< 0.03	< 0.04
	Weather resistance	-	-			Excellent	Excellent	Excellent	Excellent
	Oxygene index	D 2863	%			> 95	> 95	> 30	44
	Flammability	UL 94	-			V-0	V-0	V-0	V-0

Mechanical	Tensile strength	D 1708, D 638	psi			4 000	3 500	6 500	5 000
	Elongation	D 1708, D 638	%			300	300	200	150
	Compressive strength	D 695	psi			2 200	2 200	7 000	11 600
	Impact strength	D 256 at +23°C	Ft-Lb/in			No Break	No Break	No Break	3-6
	Flexural Modulus	D 790 at +23°C	psi			100 000	95 000	200 000	250 000
	Tensile Modulus	D 638	psi			40 000	50 000	120 000	200 000
	Hardness	D 2240	-			D-60	D-55	D-75	D-78
Thermal	Melting point		° C			305	270	260° C	160
	Melting point		° F			581	518	500° F	320
	Thermal conductivity	C-177	BTU/hr/ft 2/°F. in			1.3	1.4	1.6	1.3
	Deflection temperature 66 psi 264 psi	D 648	° C			74 48	59 57	104 71	113
	Deflection temperature 66 psi 264 psi	D 648	° F			166 118	138 134	220 160	235

ADVANTAGES OF ISOTACTIC PP V/S NORMAL GRADE PP

ISOTACTIC PP is a fractional MFI homopolymer therefore it has sufficiently better toughness than any other homopolymer

Due to the presence of atmospheric oxygen, degradation and oxidation of NORMAL GRADE PP is inevitable even when there is no direct sunlight, while ISOTATIC PP is immune to such degradation and oxidation.

Chemical resistance of ISOTACTIC PP is more than that of NORMAL GRADE PP even at an elevated temperature.

ISOTACTIC PP has excellent heat resistance upto 120ÊC as against 85-90ÊC of NORMAL GRADE PP, w.r.t water.

This grade is proven in pickling lines (CRM) as well as ARP in steel Industries for handling HCL containing ferrous and ferric chloride at an elevated temp. upto 110ÊC

This grade is also proven in Caustic Chloro Plant for application in brine for Anolyte and Catholyte service upto 100ÊC.

This grade is also proven in application of HCL with solvent traces such as benzene, toluene etc. at an elevated temperature upto 110ÊC

MINIMUM LIFE EXPECTED IN HOURS

FOR THREE CONTINUOUS SERVICE & TEMPERATURE LEVELS

FORMULATION	AT 120 ⁰C	AT 100 ⁰C	AT 80 ⁰C
ISOTACTIC PP	18,000 (2 YRS)	1,04,000 (12 YRS)	7,15,000

UNIQUE PROPERTIES OF LINING MATERIALS

PTFE (POLYTETRAFLUOROETHYLENE)

PTFE has excellent properties such as chemical inertness, heat resistance (both high and low), electrical insulation properties, low coefficient of friction (Static 0.08 and Dynamic 0.01), and nonstick property over a wide temperature range up to 260ÊC. It has a density in the range of 2.1 to 2.3 g/cm3 and melt viscosity in the range of 25 mPa.s (cP). Molecular weight of PTFE cannot be measured by standard methods. Instead, an indirect approach is used to judge molecular weight. Standard Specific Gravity (SSG) is the specific gravity of a chip prepared according to a standardized procedure.The underlying principle is that lower molecular weight PTFE crystallizes more extensively, thus yielding higher SSG values.

TFM PTFE

The new generation of chemically modified PTFE enhances the performance of classic PTFE by providing outstanding low deformation under load, compression stress relaxation (recovery), reduced permeation, fewer voids, increased surface smoothness and good welding characteristics

PFA (PER FLURO ALKOXY)
(A POLYMER OF TETRAFLUOROETHYLENE AND PERFLUOROVINYLETHER)

PFA polymers are fully fluorinated and melt-processible. They have chemical resistance and thermal stability comparable to PTFE. Specific gravity of perfluoroalkoxy resins is in the range of 2.12 to 2.17. PFA has an upper continuous use temperature of 260ÊC crystallinity and specific gravity of PFA parts decrease when the cooling rate of the molten polymer is increased. The lowest crystallinity obtained by quenching molten PFA in ice was 48% (specific gravity 2.123).

FEP (FLUORINATED ETHYLENE-PROPYLENE COPOLYMERS)
(A POLYMER OF TETRAFLUOROETHYLENE AND HEXAFLUOROPROPYLENE)

Fluorinated ethylene-propylene copolymers are fully fluorinated and melt-processible. They have excellent chemical resistance and thermal stability. Specific gravity of FEP resins is in the range of 2.13 to 2.15. FEP has an upper continuous use temperature of 200ÊC.

ETFE (ETHYLENE TETRA FLUORO ETHYLENE)
(A POLYMER OF TETRAFLUOROETHYLENE AND ETHYLENE)

PVDF and equimolar ETFE are isomers but the latter has a higher melting point and a lower dielectric loss than the former. ETFE crystallizes into unit cells believed to be orthorhombic or monoclinic. The molecular conformation of ETFE is an extended zigzag.This polymer is dissolved in some boiling esters at above 230ÊC, thus allowing determination of molecular weight (weight-average) by light scattering. ETFE has several transitions, alpha relaxation at 110ÊC (shifts to 135ÊC at higher crystallinity), beta at 25ÊC and gamma relaxation at 120ÊC. ETFE has good mechanical properties including tensile and cut-through resistance and lower creep than perfluoropolymers. ETFE is more resistant to radiation than perfluoropolymers (modestly affected up to 20 Mrad) and can be crosslinked by radiation such as electron beam. Crosslinking is used to strengthen cutthrough resistance of ETFE wire insulation.

ECTFE

Halar ECTFE is a partially fluorinated semi-crystalline polymer offering a unique combination of properties for highly demanding industries.

Outstanding chemical, permeation and fire resistance

Low permeability

Excellent weatherability

Excellent release properties

Good abrasion resistance

It is widely used in anti-corrosion applications as a lining or in self-supporting constructions (piping).Its excellent fire resistance properties and chemical resistance make HalarÎ ECTFE a product of first choice in wire and cable applications, in communication cable or speciality cable.

PPH (POLYPROPYLENE HOMOPOLYMER)

Polypropylene is available in two basic types as either homo polymer or copolymer material. Although similar in many respects each type exhibits distinct differences in both appearance and performance. Polypropylene Homopolymer (PPH) is the most widely utilized. PPH offers a high strength to weight ratio and is stiffer and stronger than copolymer, this combined with good chemical resistance and weldability allows this material to be used in many corrosion resistant structures.

PFA (CONDUCTIVE)

3M DyneonTM Fluoroplastic PFA 8502ESDZ is an electrostatic dissipative fluorothermoplastic compound consisting of a fully fluorinated PFA base polymer and an electroconductive carbon black. The product has specifically been developed for transfer moulding.

Electrostatic dissipative

Processing : Transfer moulding

Wide service temperature range upto 240ÊC

ADVANTAGES OF ISOTACTIC PP V/S NORMAL GRADE PP

MINIMUM LIFE EXPECTED IN HOURS

UNIQUE PROPERTIES OF LINING MATERIALS

CORPORATE OFFICE

FACTORY

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