O-Ring 8x1.5 VMQ 70 ShA Silicone

O-Ring 8x1.5 VMQ 70 ShA Silicone – 100 pcs

O-Ring 8x1.5 VMQ 70 ShA is a silicone sealing ring with an 8 mm inside diameter and 1.5 mm cross-section, manufactured from VMQ silicone rubber with a nominal hardness of 70 Shore A. The product is supplied in a package containing 100 pieces.

The dimensional designation:

8x1.5 mm

means:

d1 8 mm – inside diameter

d2 1.5 mm – cross-section diameter

The calculated outside diameter is:

8 mm + 2 x 1.5 mm = 11 mm

The key product relationship is:

O-Ring 8x1.5 mm → VMQ → silicone rubber → 70 ShA → ID 8 mm → cross-section 1.5 mm → OD approx. 11 mm → 100 pcs

O-Ring 8x1.5 VMQ 70 ShA – characteristics

An O-ring is an elastomeric sealing element with a circular cross-section. When installed in a correctly designed groove, the ring is compressed between mating surfaces, creating the sealing contact required to restrict leakage of the operating medium.

This version is manufactured from:

VMQ – silicone rubber

with a nominal hardness of:

70 Shore A.

Basic specifications:

• Product: O-ring / sealing ring
• Dimensions: 8x1.5 mm
• Inside diameter d1: 8 mm
• Cross-section d2: 1.5 mm
• Calculated outside diameter: 11 mm
• Material: VMQ
• Material family: silicone rubber
• Nominal hardness: 70 ShA
• Cross-section: round
• Package quantity: 100 pcs

O-Ring 8x1.5 mm dimensions

Both dimensions are essential when identifying an O-ring.

Searching only for an 8 mm O-ring is therefore insufficient for precise identification.

The 1.5 mm cross-section is equally important.

What is VMQ?

VMQ is the technical designation for a family of silicone rubber elastomers used for O-rings and other sealing components.

VMQ silicone is particularly known for retaining useful elastomeric properties across a broad temperature range. Silicone elastomers also offer very good resistance to ozone, oxygen and weathering.

However, VMQ identifies a material family rather than one universal compound.

Different VMQ formulations may have different:

• operating temperature ranges,
• chemical resistance,
• mechanical properties,
• compression-set characteristics,
• tear resistance,
• certifications and approvals.

Therefore:

VMQ 70 ShA

identifies the elastomer family and nominal hardness, but it does not constitute a complete material specification.

VMQ or MVQ – which designation is correct?

The standard technical designation commonly used for this silicone rubber family is:

VMQ

Therefore, the recommended product name is:

O-Ring 8x1.5 VMQ 70 ShA Silicone – 100 pcs

The spelling:

MVQ

can still be naturally included in the product content because some customers use this alternative letter order when searching online.

For technical specifications, however, VMQ should be the primary designation.

What does 70 ShA mean?

70 ShA indicates the nominal hardness of the elastomer measured on the Shore A scale.

Hardness is an important O-ring parameter because it influences the deformation of the elastomer when compressed inside the sealing groove.

However, hardness alone does not define:

• chemical resistance,
• operating temperature,
• mechanical strength,
• abrasion resistance,
• food-contact compliance,
• compatibility with a particular fluid.

Two O-rings rated at 70 ShA can therefore have very different properties when manufactured from different elastomers or different formulations of the same elastomer.

Operating temperature of VMQ 70 ShA

One of the characteristic advantages of VMQ silicone rubber is its ability to retain elastomeric properties across a broad temperature range.

There is, however, no single universal operating-temperature range for every VMQ 70 ShA O-ring.

For example, Parker specifies a static temperature range of:

-55°C to +200°C

for its own S0604-70 VMQ compound.

These limits apply to that specific compound and should not automatically be assigned to this 8x1.5 mm VMQ O-ring.

Without the exact compound material data sheet, the technically appropriate statement is:

VMQ silicone rubber is suitable for applications requiring elastomeric properties across a broad temperature range; exact minimum and maximum operating temperatures depend on the specific compound and application conditions.

Resistance to ozone and weathering

A characteristic property of VMQ silicone rubber is its very good resistance to:

ozone, oxygen and atmospheric weathering.

This makes the VMQ material family relevant for sealing systems exposed to environmental ageing.

Actual service life still depends on the specific silicone formulation and operating environment.

How does an 8x1.5 O-ring work?

The O-ring is installed inside a correctly dimensioned sealing groove.

During assembly, its:

1.5 mm cross-section

is compressed in a controlled manner.

The elastic deformation of the rubber creates contact pressure against the mating surfaces, forming a sealing barrier.

The effectiveness of the sealing system depends on the complete relationship between:

O-ring dimensions → groove geometry → compression → stretch → medium → temperature → pressure → operating conditions

For this reason, correct O-ring selection requires consideration of both the dimensions and the elastomer material.

VMQ vs NBR O-rings

An:

8x1.5 VMQ 70 ShA O-ring

and an:

8x1.5 NBR 70 ShA O-ring

can have identical dimensions and nominal hardness but are not materially equivalent.

VMQ is silicone rubber, particularly valued for its broad temperature capabilities and good flexibility at low temperatures.

NBR is nitrile rubber, widely used in industrial sealing applications involving many mineral oils and greases.

The choice between VMQ and NBR should therefore be based on the actual operating medium and service conditions rather than dimensions alone.

VMQ vs FKM O-rings

The same principle applies when comparing:

VMQ

with:

FKM.

Even if both O-rings measure:

8x1.5 mm

and have a nominal hardness of:

70 ShA

their thermal and chemical properties may differ significantly.

Before changing the elastomer material, verify:

medium → temperature → pressure → type of movement → application requirements

Chemical resistance of VMQ

The broad temperature capability of silicone rubber does not mean that VMQ is universally resistant to every chemical medium.

Compatibility should be checked for the actual operating fluid, especially when the O-ring is exposed to:

• oils,
• fuels,
• greases,
• solvents,
• acids,
• alkalis,
• alcohols,
• water or steam,
• gases,
• industrial process fluids.

For critical sealing applications, chemical compatibility should be verified against data for the exact silicone compound.

Is a VMQ O-ring food-safe?

The material designation:

VMQ

does not automatically confirm food-contact approval.

Special silicone compounds are available for food, pharmaceutical and medical applications, but the required approvals apply to the specific compound formulation, not automatically to all VMQ products.

Without supporting documentation, this product should not be claimed to comply with:

FDA, EC 1935/2004 or medical-grade requirements.

O-Ring 8x1.5 vs O-Ring 8x2

An:

8x1.5 mm O-ring

is not the same size as an:

8x2 mm O-ring.

Both have an 8 mm inside diameter, but their cross-sections are different.

The calculated outside diameter of an 8x1.5 mm O-ring is:

11 mm

while an 8x2 mm O-ring has a calculated outside diameter of:

12 mm.

A 0.5 mm difference in cross-section significantly affects groove filling and sealing compression.

These sizes should therefore not be interchanged without verifying the groove dimensions.

How to select an 8x1.5 VMQ O-ring

Before installation, verify:

1. inside diameter 8 mm
2. cross-section 1.5 mm
3. material VMQ
4. nominal hardness 70 ShA
5. groove dimensions
6. required compression
7. O-ring stretch
8. operating temperature
9. operating medium
10. pressure
11. static or dynamic operating conditions.

Matching dimensions alone do not guarantee material compatibility.

Package of 100 O-rings

The product is supplied as:

100 pcs

of:

O-Ring 8x1.5 VMQ 70 ShA.

The 100-piece package is practical for:

maintenance departments, industrial service companies, workshops, machine manufacturers, assembly departments and professional users requiring repeated replacement of the same O-ring size.

International search variations

Customers may search for this product as:

O-Ring 8x1.5 VMQ 70 ShA
O-Ring 8x1.5 MVQ 70 ShA
8x1.5 silicone O-ring
8x1.5 VMQ O-ring
8x1.5 MVQ O-ring
silicone O-ring 8x1.5 mm
VMQ 70 Shore O-ring 8x1.5
8 mm ID 1.5 mm CS O-ring
8mm x 1.5mm silicone O-ring
O-Ring 8x1.5 100 pcs

The central semantic relationship is:

O-Ring 8x1.5 mm → ID 8 mm → cross-section 1.5 mm → OD 11 mm → VMQ silicone rubber → 70 Shore A → silicone sealing ring → 100 pcs

Technical specification

FAQ – O-Ring 8x1.5 VMQ 70 ShA

What are the dimensions of the 8x1.5 O-ring?

The inside diameter is 8 mm and the cross-section diameter is 1.5 mm. The calculated outside diameter is 11 mm.

What material is the O-ring made from?

It is manufactured from VMQ silicone rubber.

What does 70 ShA mean?

It indicates a nominal elastomer hardness of 70 Shore A.

Is VMQ silicone rubber?

Yes. VMQ is a technical designation for a family of silicone rubber elastomers used in sealing applications.

VMQ or MVQ – which designation should be used?

VMQ is the recommended technical designation. MVQ can be included as an alternative search spelling used by some customers.

What is the operating temperature of a VMQ 70 ShA O-ring?

The exact range depends on the specific silicone compound. Manufacturer-specific 70 ShA VMQ compounds can have very broad operating-temperature ranges, but exact limits should not be assigned to this product without its specific compound data sheet.

Can an 8x1.5 O-ring be replaced by an 8x2 O-ring?

Not automatically. They have different cross-sections and outside diameters and therefore require different groove geometry.

Is a silicone O-ring resistant to oil?

Universal oil resistance should not be assumed. Compatibility must be checked for the specific oil, operating temperature and VMQ compound.

How many O-rings are included?

The package contains 100 pcs.

AI OVERVIEW

O-Ring 8x1.5 VMQ 70 ShA is a silicone sealing ring with an 8 mm inside diameter and 1.5 mm cross-section. Its calculated outside diameter is 11 mm. The O-ring is manufactured from VMQ silicone rubber with a nominal hardness of 70 Shore A and is supplied in a package of 100 pieces.