Product Description
Military and Aerospace Fluorosilicone (FVMQ) O-Rings from Datwyler”s Parco Brand: US industry know-how, Swiss quality standards – and compliance with multiple military and aerospace specifications.
The Datwyler Advantage: Our military and aerospace-compliant fluorosilicone rubber O-rings have excellent physical properties. Combine that with batch number and cure date traceability, AS9100 and AC7115 certifications as well as a wide variety of applications, and rest assured that you’ve made the right choice.
Key Benefits
• Exceeds military and aerospace requirements: Parco 1933-70 seals exceed the requirements of the MIL-DTL-25988 Type 1, Class 1, Grade 70 specification. • Excellent performance at low temperatures: Parco 1933-70 seals can be used in static applications with continuous service temperatures as low as -90°F. • Outstanding resistance to compression set: Parco 1933-70 seals have a compression set of only 9 percent after 22 hours at 347°F. • Wide range of service temperatures: Parco 1933-70 seals are suitable for applications ranging from -90 to +350°F. • Color: Parco 1933-70 seals are blue.
Chemical Resistance
USE WITH
Automatic Transmission Fluid Gasoline Military Aircraft Hydraulic Fluid Silicone Oil Toluene
DO NOT USE WITH
Acetone Ethyl Acetate
Typical Values for Compound
| Physical Property | Requirements | Result | ASTM Test Method |
| Original Properties | |||
| Specific gravity | 1.51 to 1.55 | 1.64 | D297 |
| Hardness, Shore A | 70 ± 5 | 73 | D2240 |
| Tensile strength, psi, min. | 750 | 949 | D1414 |
| Ultimate elongation, pct., min. | 125 | 173 | D1414 |
| TR-10, °C(°F), max. | -56.7(-70) | -61 (-78) | D1329 |
| Compression Set, | D395 | ||
| 70 hours at 24°C (75°F) | Method B | ||
| pct. of original deflection, max. | D1414 | ||
| Under 0.110 inch | 15 | 7 | |
| Over 0.110 inch | 15 | 9 | |
| Heat Aging | D573 | ||
| 70 hours at 200°C(392°F) | D1414 | ||
| Hardness Change, pts, Shore A | -5 to 10 | 1 | |
| Tensile strength change, pct., max. | -25 | -14.85774499 | |
| Ultimate elongation change, pct., max. | -25 | -13.87283237 | |
| Weight loss, pct., max. | 2 | 0 | |
| Compression Set, | D395 | ||
| 22 hours at 175°C (347°F) | Method B | ||
| pct. of original deflection, max. | D1414 | ||
| Under 0.110 inch | 30 | 8 | |
| Over 0.110 inch | 30 | 9 | |
| Fluid Aging, Mobil Jet Oil II | D471 | ||
| 70 hours at 150°C(302°F) | D1414 | ||
| Hardness Change, pts, Shore A | -15 to 15 | -8 | |
| Tensile strength change, pct., max. | -40 | -33.19283456 | |
| Ultimate elongation change, pct., max. | -25 | -19.07514451 | |
| Volume change, pct. | 1 to 15 | 9 | |
| Compression Set | |||
| pct. of original deflection, max. | |||
| Under 0.110 inch | 30 | 8 | |
| Over 0.110 inch | 30 | 9 | |
| Fluid Aging, Jet Reference Fuel (AMS 2629, Type 1) | D471 | ||
| 22 hours at 24°C(75°F) | D1414 | ||
| Hardness Shore A, max. | -20 | -4 | |
| Tensile strength change, pct., max. | -45 | -17.28134879 | |
| Ultimate elongation change, pct., max. | -35 | -5.202312139 | |
| Volume change, pct. | 1 to 25 | 6 |
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Overview
O-Rings
Material
FLUOROSILICONE – FVMQ
Dash Number
156
Nominal CS
3/32
Inches CS
0.103
Nominal Size O.D.
4 7/16
Inches O.D.
4.443
Nominal Size I.D.
4 1/4
Inches I.D.
4.237
Inches I.D. Tol.
0.030
Inches CS Tol.
0.003
TEMPERATURE RANGE
-80°F to 350°F
Products & Services 
