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DIN 7603A Vulcanized Fiber Sealing Ring

DIN 7603A Vulcanized Fiber Sealing Ring (Form A) — Vulcanized Fiber, Natural Finish

FULLERKREG DIN 7603A flat sealing rings are manufactured to DIN 7603 Form A standard in vulcanized fiber (also known as hard fiber or fish paper) with a natural finish. DIN 7603 Form A is a flat (plain) sealing ring used for pipe flanges (DIN 3850), plug screws (DIN 908), ball-type pipe fittings, and hollow connections (DIN 7001). Vulcanized fiber is a dense, tough cellulose-based material produced by treating cotton or wood pulp with zinc chloride, then washing and drying under pressure. It provides electrical insulation, oil resistance, and lightweight sealing — making it the preferred non-metallic option in DIN 7603 for electrical, low-pressure, and vibration-damping applications where metal sealing rings are not required.

Product Highlights

  • Standard: DIN 7603 Form A (Flat Sealing Ring)
  • Material: Vulcanized Fiber (Hard Fiber / Fish Paper)
  • Surface: Natural finish — no coating, no treatment
  • Profile: Form A — flat plain ring (no inner or outer bead)
  • Size Range: d1 6 – 90 mm (inner diameter)
  • Electrically insulating — prevents galvanic corrosion between dissimilar metals
  • Oil & fuel resistant — suitable for mineral oil and fuel contact
  • Lightweight — density ~1.3 g/cm³, significantly lighter than metal rings
  • Vibration damping — fiber material absorbs vibration better than metal
  • Temperature resistance: Up to +120°C continuous service
  • RoHS & REACH Compliant

Dimensional Specifications — DIN 7603 Form A, Vulcanized Fiber

All dimensions in millimeters (mm). Per DIN 7603 Form A.

Nominal Size d1 (ID) d2 (OD) b (thickness)
6×10 6.0 10.0 1.5
6.5×10 6.5 10.0 1.5
7×11 7.0 11.0 1.5
8×12 8.0 12.0 1.5
8×13 8.0 13.0 1.5
8×14 8.0 14.0 1.5
9×13 9.0 13.0 1.5
10×13.5 10.0 13.5 1.5
10×14 10.0 14.0 1.5
10×16 10.0 16.0 1.5
11×15 11.0 15.0 1.5
12×16 12.0 16.0 1.5
12×18 12.0 18.0 1.5
12×20 12.0 20.0 1.5
13×17 13.0 17.0 1.5
14×18 14.0 18.0 1.5
14×20 14.0 20.0 1.5
15×19 15.0 19.0 1.5
16×20 16.0 20.0 1.5
16×22 16.0 22.0 1.5
17×21 17.0 21.0 1.5
18×22 18.0 22.0 1.5
18×24 18.0 24.0 1.5
19×23 19.0 23.0 1.5
20×24 20.0 24.0 1.5
20×26 20.0 26.0 1.5
21×25 21.0 25.0 1.5
22×27 22.0 27.0 1.5
22×29 22.0 29.0 1.5
24×29 24.0 29.0 1.5
24×32 24.0 32.0 1.5
26×32 26.0 32.0 1.5
27×32 27.0 32.0 1.5
28×34 28.0 34.0 1.5
29×36 29.0 36.0 2.0
30×36 30.0 36.0 2.0
32×38 32.0 38.0 2.0
33×40 33.0 40.0 2.0
34×40 34.0 40.0 2.0
35×42 35.0 42.0 2.0
36×41 36.0 41.0 2.0
38×44 38.0 44.0 2.0
40×46 40.0 46.0 2.0
40×47 40.0 47.0 2.0
42×48 42.0 48.0 2.0
44×50 44.0 50.0 2.0
45×52 45.0 52.0 2.0
48×55 48.0 55.0 2.0
50×57 50.0 57.0 2.0
52×59 52.0 59.0 2.0
55×62 55.0 62.0 2.0
58×65 58.0 65.0 2.0
60×67 60.0 67.0 2.0
62×70 62.0 70.0 2.0
65×72 65.0 72.0 2.0
68×75 68.0 75.0 2.0
70×78 70.0 78.0 2.0
72×80 72.0 80.0 2.0
75×83 75.0 83.0 2.0
78×86 78.0 86.0 2.0
80×88 80.0 88.0 2.0
85×93 85.0 93.0 2.0
90×100 90.0 100.0 2.0

All dimensions in mm per DIN 7603 Form A. d1 = inner diameter; d2 = outer diameter; b = thickness. Sizes d1 6–28mm: b = 1.5mm. Sizes d1 29–90mm: b = 2.0mm.

Vulcanized Fiber vs. Copper vs. Aluminum — Material Comparison

Property Vulcanized Fiber (This Product) Copper T3 Aluminum
Material type Non-metallic (cellulose-based) Metal Metal
Density ~1.3 g/cm³ — lightest option 8.9 g/cm³ 2.7 g/cm³
Electrical insulation Yes — excellent insulator No — conductor No — conductor
Max. service temperature +120°C continuous +300°C +150°C
Sealing mechanism Compression / conformability Plastic deformation Plastic deformation
Vibration damping Good — fiber absorbs vibration Limited Limited
Oil & fuel resistance Good Excellent Excellent
Water resistance Limited — fiber can absorb moisture Excellent Excellent
Cost Lowest Higher Low

DIN 7603 Form A vs. Form C vs. Form D

Feature Form A (This Product) Form C Form D
Profile Flat plain ring Inner bead Outer bead
Sealing area Full flat face Inner bead concentrates sealing force Outer bead concentrates sealing force
Typical use General fittings, electrical insulation Higher pressure, concentrated seal Higher pressure, concentrated seal

Material Properties — Vulcanized Fiber

Property Value
Material Vulcanized Fiber (Hard Fiber / Fish Paper)
Base material Cellulose (cotton or wood pulp, zinc chloride treated)
Surface Natural finish — no coating
Density ~1.25–1.40 g/cm³
Tensile Strength 80–120 MPa
Electrical Insulation Excellent — dielectric strength ~10–20 kV/mm
Max. Service Temperature +120°C continuous (dry conditions)
Oil Resistance Good — mineral oil and fuel compatible
Water Resistance Limited — avoid prolonged water immersion
RoHS / REACH Compliant

Application Scenarios

  • Electrical insulation sealing — prevents galvanic corrosion between dissimilar metals in pipe connections
  • Low-pressure hydraulic & pneumatic fittings — plug screws (DIN 908), pipe fittings at moderate pressures
  • Automotive fuel & oil systems — lightweight, oil-resistant sealing for non-critical connections
  • Electrical enclosures & control panels — insulating gaskets for pipe entries
  • Vibration-sensitive assemblies — fiber material provides better vibration damping than metal rings
  • Cost-sensitive applications — most economical DIN 7603 Form A option
  • General pipe fittings — where electrical insulation or lightweight is required

Product Photo Gallery

FULLERKREG DIN 7603A Vulcanized Fiber Sealing Ring, Natural Finish:

[ Photo 1 ] [ Photo 2 ] [ Photo 3 ] [ Photo 4 ]

Why Choose FULLERKREG?

  • 🏭 Direct manufacturer — factory in China, no middlemen
  • 📐 Strict DIN dimensional control — 100% inspection on critical dimensions
  • 🌍 Global export experience — serving distributors in Europe, North America, Southeast Asia
  • 📦 Flexible MOQ — small trial orders and large bulk shipments both welcome
  • 📋 Full documentation — material certs, RoHS declarations available
  • ⚡ Fast lead times — standard sizes in stock, ready to ship

Frequently Asked Questions

Q: What is vulcanized fiber?
A: Vulcanized fiber (also called hard fiber or fish paper) is a dense, tough material made from cellulose (cotton or wood pulp) treated with zinc chloride, then washed and dried under pressure. It is electrically insulating, oil-resistant, and lightweight — widely used as an industrial gasket and insulation material.

Q: When should I choose vulcanized fiber over metal sealing rings?
A: Choose vulcanized fiber when electrical insulation is required (to prevent galvanic corrosion between dissimilar metals), when vibration damping is beneficial, or when cost is the primary concern at low-to-moderate pressures and temperatures below +120°C. Choose metal rings for high pressure, high temperature, or steam applications.

Q: Is vulcanized fiber water-resistant?
A: Vulcanized fiber has limited water resistance — it can absorb moisture over time, which may cause swelling or softening. It is suitable for oil and fuel contact but should not be used in prolonged water immersion applications.

Q: What is the maximum temperature for vulcanized fiber sealing rings?
A: Up to +120°C continuous in dry conditions. Not suitable for steam or high-temperature applications — use copper T3 rings for temperatures above +120°C.

Q: Do you provide material test certificates?
A: Yes. Material data sheets and RoHS declarations available upon request.

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