PVDF Spectacle Blind Flange

Petron Thermoplast is a leading manufacturer and supplier of premium quality PVDF Spectacle Blind Flanges designed for highly corrosive and demanding industrial applications. Manufactured using high-grade Polyvinylidene Fluoride (PVDF), our spectacle blind flanges offer exceptional chemical resistance, excellent mechanical strength, and superior temperature performance.
A PVDF Spectacle Blind Flange is a safety isolation component consisting of one solid disc and one open ring connected by a metal bridge. The assembly resembles a pair of spectacles, which is why it is commonly known as a spectacle blind flange. It allows operators to easily switch between open and closed flow conditions while ensuring safe maintenance and inspection procedures.
PVDF spectacle blind flanges are widely used in chemical processing plants, semiconductor industries, water treatment systems, pharmaceutical facilities, and corrosive fluid handling applications where reliability and chemical resistance are essential.

PVDF Spectacle Blind Flange Details

Item	Dimension	Description	Unit
A	Overall Length	Total height of spectacle blind from top disc to bottom ring	mm
B	Top Blind Disc OD	Outside diameter of upper blind section	mm
C	Bottom Ring OD	Outside diameter of lower open ring section	mm
D	Bottom Ring ID / Bore	Internal opening diameter of flow ring	mm
E	Minimum Neck Width	Narrowest width between upper and lower sections	mm
F	Center-to-Center Distance	Distance between blind disc center and ring center	mm
G	Center Hole Diameter	Diameter of central lifting/locking hole	mm
H	Center Hole Offset	Distance from ring center to center hole	mm
I	Plate Thickness	Overall thickness of spectacle blind	mm
J	Neck Blend Radius	Radius connecting blind disc to neck section	mm
K	Straight Neck Length	Vertical neck section length	mm
L	Blind Disc Radius	Radius of upper blind disc section	mm
M	Ring Wall Thickness	Thickness of open ring wall section	mm
N	Material Thickness Reference	Side view thickness reference	mm
O	Special Fabrication Dimension	Customer-specific machining dimension	mm

Parameter	Specification
Product Name	PVDF Spectacle Blind Flange
Material	Virgin Polyvinylidene Fluoride (PVDF)
Manufacturing Process	CNC Machined / Fabricated
Construction Type	Blind Disc and Spacer Ring Assembly
Size Range	DN15 (½”) to DN600 (24″)
Pressure Ratings	PN6, PN10, PN16, Customized Ratings Available
Operating Temperature	-40°C to +140°C
Density	Approx. 1.77–1.80 g/cm³
Tensile Strength	Approx. 40–55 MPa
Elongation at Break	Approx. 20–50%
Water Absorption	Less than 0.05%
Thermal Conductivity	Approx. 0.19 W/m·K
Coefficient of Thermal Expansion	Approx. 1.2 × 10⁻⁴ mm/mm/°C
UV Resistance	Excellent
Weather Resistance	Excellent
Chemical Resistance	Excellent resistance to acids, alkalis, oxidizing agents, and solvents
Surface Finish	Smooth Machined Finish
Flange Face Type	Flat Face (FF), Raised Face (RF)
Connection Method	Bolted Flange Connection
Flange Standards	DIN, ANSI, JIS, BS, IS
Color	Natural White / Off White
Gasket Compatibility	PTFE, EPDM, FKM (Viton)
Installation Orientation	Horizontal and Vertical Pipelines
Service Life	Long-Term Industrial Service
Application Media	Acids, Alkalis, Chemicals, Ultra-Pure Water, Corrosive Fluids
Customization Options	Customized Sizes, Thicknesses, Pressure Ratings, and Drilling Patterns
Compliance Standards	ASTM, DIN, ISO, ANSI and Customer Specifications

Key Features of PVDF Spectacle Blind Flanges

Exceptional Chemical Resistance

Resistant to acids, alkalis, oxidizing agents, chlorinated chemicals, and aggressive solvents.

High Temperature Performance

Capable of operating continuously in elevated temperature environments.

Superior Mechanical Strength

Offers high impact strength and dimensional stability.

Corrosion-Free Construction

Will not rust, scale, or deteriorate in aggressive process conditions.

Excellent UV Stability

Suitable for outdoor installations and harsh environmental conditions.

High Purity Material

Ideal for ultra-pure fluid handling applications.

Easy Installation

Simple design allows quick flow isolation and maintenance procedures.

Long Service Life

Provides reliable performance with minimal maintenance requirements.

Nominal Size (DN)	Nominal Size (Inch)	PN6	PN10	PN16
DN15	½”	✔	✔	✔
DN20	¾”	✔	✔	✔
DN25	1″	✔	✔	✔
DN32	1¼”	✔	✔	✔
DN40	1½”	✔	✔	✔
DN50	2″	✔	✔	✔
DN65	2½”	✔	✔	✔
DN80	3″	✔	✔	✔
DN100	4″	✔	✔	✔
DN125	5″	✔	✔	✔
DN150	6″	✔	✔	✔
DN200	8″	✔	✔	Available on Request
DN250	10″	✔	Available on Request	Available on Request
DN300	12″	✔	Available on Request	Available on Request
DN350	14″	Available on Request	Available on Request	Available on Request
DN400	16″	Available on Request	Available on Request	Available on Request
DN450	18″	Available on Request	Available on Request	Available on Request
DN500	20″	Available on Request	Available on Request	Available on Request
DN600	24″	Available on Request	Available on Request	Available on Request

If you are searching for customized product designs that meet your requirements, don’t worry. Petron Thermoplast also offers custom product manufacturing services to meet the unique needs of various industries. Work with our expert engineers to create custom designs suited for your application.

Benefits of Using PVDF Spectacle Blind Flange

Excellent Chemical Resistance

Resistant to strong acids, alkalis, solvents, and halogens, making it ideal for highly corrosive services.

High Temperature Capability

Performs reliably up to 120°C, higher than PP and uPVC alternatives.

Corrosion-Free Material

Completely immune to rust, pitting, scaling, and galvanic corrosion.

Excellent UV Resistance

Suitable for both indoor and outdoor installations without degradation.

High Purity & Non-Contaminating

Suitable for pharmaceutical, semiconductor, and ultrapure chemical systems.

Lightweight Construction

Significantly lighter than metal blind flanges, reducing handling and installation effort.

Long Service Life

Maintains mechanical strength and chemical resistance over extended operating periods.

Low Maintenance

No coating, painting, or corrosion protection required

Thermal & Electrical Insulation

Low thermal conductivity and electrically non-conductive material enhance safety.

Easy Installation

Compatible with standard DIN / ANSI / ISO bolt patterns.

Leak-Proof Sealing

Flat-face design ensures effective gasket sealing.

Cost-Effective Over Lifecycle

Lower maintenance and replacement costs compared to metal flanges in corrosive environments.

Why Choose Petron Thermoplast?

At Petron Thermoplast, we specialize in manufacturing precision-engineered PVDF spectacle blind flanges according to global standards. Our advantages include:

Accurate machining and flat sealing faces

Full range from Class 150 to Class 2500

Materials certified to ASTM, EN, and ISO standards

Optional RTJ, FF, or RF face types

Quick delivery and custom production

Whether for a large infrastructure project or a small-scale pipeline system, Petron Thermoplast is your trusted partner for high-quality PVDF spectacle blind flanges.