描述
VESTAMID X7099 is a 20% glass-fiber-reinforced PA612 engineering resin from Evonik Operations GmbH developed specifically for the production of plastic-rubber composite components.
Its most important differentiator is direct bonding to selected elastomers. Parts molded from VESTAMID X7099 can be co-vulcanized with rubber compounds such as XNBR, HNBR, AEM and FPM/FKM without using a separate adhesive or adhesion promoter.
Evonik refers to this application concept as the K&K process / direct-bonding-to-rubber technology. It allows the rigid thermoplastic section and the elastomeric section to be combined during rubber vulcanization, potentially reducing separate bonding steps and simplifying production of integrated plastic-rubber assemblies.
This makes VESTAMID X7099 highly relevant to automotive and industrial components where a stiff PA612 support section must be permanently integrated with an oil-resistant, heat-resistant or flexible rubber element.
The grade contains approximately 20% glass fiber, providing a dry tensile modulus of approximately 5,800 MPa and a dry yield stress of approximately 125 MPa. These values give the thermoplastic portion enough stiffness and strength for structural support while retaining the chemical and moisture-resistance advantages of long-chain PA612.
PA612 is especially useful in fluid-contact and under-hood environments. Compared with PA6 and PA66, VESTAMID X7099 has significantly lower moisture absorption. Current grade data lists approximately 2.0% water absorption and 0.8% humidity absorption, helping molded dimensions and mechanical behavior remain more stable as ambient humidity changes.
The semi-crystalline resin also provides strong resistance to fuels, oils, greases and many other chemicals. These properties are valuable in seals, engine components, valve elements, vibration-control parts and other assemblies exposed to automotive or industrial fluids.
Thermal capability is another major advantage. The grade has a melting temperature of approximately 215°C, HDT of approximately 190°C at 1.80 MPa and 210°C at 0.45 MPa, and a Vicat B softening temperature around 205°C.
Current grade data also shows good impact behavior for a reinforced PA612: approximately 80 kJ/m² unnotched Charpy at 23°C, 60 kJ/m² at -30°C, 10 kJ/m² notched Charpy at 23°C and 7 kJ/m² at -30°C.
The current generic grade is supplied in natural-color cylindrical pellets in moisture-proof packaging. Evonik states a shelf life of at least two years in the original undamaged package when stored dry at temperatures not exceeding 30°C.
For more engineering-polyamide materials, browse our PA12 / Specialty Polyamide Product Category →.
For manufacturer information about this direct-bonding technology, see the Evonik Plastic-Rubber Composites Guide →.
Key Features of VESTAMID X7099
| Feature | Engineering Benefit |
|---|---|
| 20% Glass Fiber Reinforcement | Provides high stiffness and structural strength |
| PA612 Base Resin | Lower moisture sensitivity than PA6 and PA66 |
| Direct Bonding to Rubber | Enables co-vulcanization without separate adhesives or adhesion promoters |
| Compatible Rubber Families | Suitable for selected XNBR, HNBR, AEM and FPM/FKM compounds |
| Heat Stabilized | Supports elevated-temperature automotive and industrial use |
| Fuel Resistance | Useful for components exposed to hydrocarbon fuels |
| Oil & Grease Resistance | Suitable for lubricated and under-hood environments |
| High Heat Deflection | HDT up to approximately 190–210°C depending on load |
| Good Dimensional Stability | Low moisture uptake and glass-fiber reinforcement reduce dimensional change |
| Injection Molding | Supports repeatable molding of precision structural inserts |
| Semi-Crystalline Morphology | Provides chemical resistance and mechanical durability |
| Global Availability | Current public material data lists broad regional availability |
The strongest reason to specify VESTAMID X7099 is the combination of PA612-GF20 structural performance and direct rubber-bonding capability.
Typical Applications for VESTAMID X7099
VESTAMID X7099 is most useful where a rigid thermoplastic structure must be permanently integrated with an elastomer.
| Application Area | Typical Use |
|---|---|
| Plastic-Rubber Composite Components | Rigid PA612 insert combined with a vulcanized elastomer |
| Oil-Resistant Seals | Reinforced plastic carrier with bonded rubber sealing surface |
| Engine & Machinery Sealing Components | Parts exposed to oil, grease, fuel and heat |
| Valve Flaps / Valve Components | Structural thermoplastic section bonded to sealing rubber |
| Reinforced Profiles | Stiff PA612 reinforcement integrated with flexible rubber |
| Vibration-Control Components | Rigid carrier plus elastomeric damping section |
| Automotive Under-Hood Components | Parts requiring fluid resistance and dimensional stability |
| Industrial Machinery Components | Composite parts combining stiffness and elastomeric sealing |
| Rubber-Molded Inserts | Injection-molded PA612 insert subsequently co-vulcanized with rubber |
Evonik’s plastic-rubber composite literature identifies applications across oil-resistant seals, molded components, valve elements and other automotive/industrial hybrid parts.
Typical Properties of VESTAMID X7099
Physical & Rheological Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Density | 1.20 g/cm³ | ISO 1183 |
| Glass Fiber Content | 20% | Grade classification |
| Water Absorption | 2.0% | Similar to ISO 62 |
| Humidity Absorption | 0.8% | Similar to ISO 62 |
| Molding Shrinkage – Parallel | 0.6% | ISO 294-4 / 2577 |
| Molding Shrinkage – Normal | 0.9% | ISO 294-4 / 2577 |
| Structure | Semi-crystalline | Manufacturer information |
| Delivery Form | Cylindrical Pellets | Manufacturer information |
The relatively low moisture uptake is a key advantage of VESTAMID X7099 compared with more hygroscopic PA6 and PA66 compounds.
Mechanical Properties
| Property | Typical Dry Value | Test Method |
|---|---|---|
| Tensile Modulus | 5,800 MPa | ISO 527 |
| Yield Stress | 125 MPa | ISO 527 |
| Yield Strain | 3.9% | ISO 527 |
| Nominal Strain at Break | 4.4% | ISO 527 |
| Charpy Impact, 23°C | 80 kJ/m² | ISO 179/1eU |
| Charpy Impact, -30°C | 60 kJ/m² | ISO 179/1eU |
| Charpy Notched Impact, 23°C | 10 kJ/m² | ISO 179/1eA |
| Charpy Notched Impact, -30°C | 7 kJ/m² | ISO 179/1eA |
These properties position VESTAMID X7099 as a stiff reinforced thermoplastic rather than an impact-modified flexible nylon.
Thermal Properties
| Property | Typical Value | Test Method |
|---|---|---|
| Melting Temperature | 215°C | ISO 11357-1/-3 |
| HDT @ 1.80 MPa | 190°C | ISO 75-1/-2 |
| HDT @ 0.45 MPa | 210°C | ISO 75-1/-2 |
| Vicat Softening Temperature B | 205°C | ISO 306 |
| Flammability @ 1.6 mm | HB | IEC 60695-11-10 |
The high HDT and 215°C melting point make the grade suitable for many elevated-temperature automotive and machinery applications.
Electrical Properties
| Property | Typical Dry Value | Test Method |
|---|---|---|
| Relative Permittivity, 100 Hz | 4.4 | IEC 62631-2-1 |
| Relative Permittivity, 1 MHz | 3.9 | IEC 62631-2-1 |
| Dissipation Factor, 100 Hz | 0.065 | IEC 62631-2-1 |
| Dissipation Factor, 1 MHz | 0.043 | IEC 62631-2-1 |
| Volume Resistivity | 1 × 10¹² Ω·m | IEC 62631-3-1 |
These values can be useful when VESTAMID X7099 is used in molded hybrid parts near electrical or electromechanical systems.
Why Choose VESTAMID X7099?
The main reason to choose VESTAMID X7099 is its ability to combine a rigid glass-reinforced polyamide component with an elastomer without a conventional adhesive layer.
Traditional plastic-rubber assemblies often require surface pretreatment, primer, adhesive application and curing. Every additional step creates process time, quality-control requirements and another possible failure interface.
The direct-bonding concept can simplify this structure. The PA612 component is first injection molded, then combined with the selected rubber compound and co-vulcanized under the appropriate process conditions.
This can be especially valuable in components where the rubber performs a sealing, damping or flexible function while the thermoplastic section provides stiffness, dimensional control or assembly features.
The 20% glass fiber content also gives the grade significantly higher stiffness than unfilled PA612. A tensile modulus around 5.8 GPa provides strong structural support without the density and rigidity of a 40–50% glass-filled grade.
Chemical resistance is another major selection factor. Oils, fuels and greases can contact both the plastic and rubber portions of under-hood components. VESTAMID X7099 is specifically designed for these environments.
Lower water absorption than PA6 or PA66 improves dimensional stability, which is especially valuable where the plastic section must maintain sealing geometry around a rubber interface.
Finally, the grade provides high thermal resistance. HDT values around 190–210°C support demanding applications where ordinary lower-temperature engineering plastics may soften excessively.
Processing Guidelines for VESTAMID X7099
VESTAMID X7099 is designed primarily for injection molding.
Current grade-specific ISO test-specimen conditions are:
| Processing Parameter | Published Value |
|---|---|
| Injection-Molding Melt Temperature | 260°C |
| Mold Temperature | 80°C |
| Injection Velocity | 200 mm/s |
Evonik’s dedicated VESTAMID processing guide gives a broader PA612 processing-temperature range of approximately 230–270°C for X7099.
This means the 260°C ISO value should be treated as a standardized test condition, while 230–270°C is the more useful general starting range for production optimization.
For commercial molding, evaluate:
- Melt temperature
- Mold temperature
- Injection speed
- Holding pressure
- Gate size and position
- Fiber orientation
- Weld-line location
- Shrinkage
- Surface quality
- Dimensional tolerance
- Rubber-contact geometry
- Co-vulcanization temperature and time
Because the final application often depends on direct bonding to rubber, the plastic molding process and subsequent rubber vulcanization process should be developed as one integrated process.
The actual bond strength depends not only on the PA612 grade but also on the rubber formulation, cross-linking chemistry, molding conditions, surface cleanliness and composite geometry.
Material is supplied in moisture-proof packaging. Opened material should be kept dry, and the latest Evonik handling recommendations should be followed before production.
VESTAMID X7099 vs. VESTAMID DX9321
| Feature | VESTAMID X7099 | VESTAMID DX9321 |
|---|---|---|
| Base Polymer | PA612 | PA612 |
| Glass Fiber | 20% | 20% |
| Impact Modification | No specific impact-modified designation | Impact Modified |
| Density | 1.20 g/cm³ | Approx. 1.19 g/cm³ |
| Tensile Modulus, Dry | 5,800 MPa | Approx. 5,700 MPa |
| Main Tensile Strength | 125 MPa yield | Approx. 115 MPa break |
| 23°C Unnotched Charpy | 80 kJ/m² | Approx. 93 kJ/m² |
| 23°C Notched Charpy | 10 kJ/m² | Approx. 18 kJ/m² |
| -30°C Notched Charpy | 7 kJ/m² | Approx. 11 kJ/m² |
| Melting Temperature | 215°C | Approx. 215°C |
| Primary Positioning | Direct-bonding PA612-GF20 | Impact-modified PA612-GF20 for plastic-rubber composites |
| Main Selection Reason | Higher structural focus with direct rubber bonding | Greater impact performance with similar reinforcement level |
Both grades are used in Evonik’s plastic-rubber composite technology.
Choose VESTAMID X7099 when the specification calls for the standard 20% glass-fiber PA612 direct-bonding grade.
Choose VESTAMID DX9321 when the design requires a 20% GF impact-modified PA612 with higher notched impact performance.
Rubber compatibility and bond performance must be validated with the exact elastomer compound and vulcanization system.
Related Products
VESTAMID DX9321 – 20% glass-fiber-reinforced, impact-modified PA612 for plastic-rubber composites.
VESTAMID DX9323 – 35% glass-fiber-reinforced impact-modified PA612 for higher stiffness plastic-rubber composite components.
VESTAMID DX9325 – 40% glass-fiber-reinforced PA612 for high-stiffness plastic-rubber hybrid components.
View More Specialty Polyamide Materials →
Technical Documents for VESTAMID X7099
| Document Type | Description |
|---|---|
| TDS | Physical, mechanical, thermal, electrical and molding data |
| SDS | Safety Data Sheet |
| Plastic-Rubber Composite Guide | Direct-bonding and K&K process overview |
| Processing Guide | PA612 injection-molding guidance |
| COA | Batch-specific quality information where available |
| Application Support | Rubber compatibility and composite-part evaluation |
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FAQ About VESTAMID X7099
Q1: What is VESTAMID X7099?
VESTAMID X7099 is a 20% glass-fiber-reinforced PA612 from Evonik developed specifically for plastic-rubber composite parts.
Q2: What does PA612-GF20 mean?
PA612 is polyamide 612, while GF20 indicates approximately 20% glass-fiber reinforcement.
Q3: Can VESTAMID X7099 bond directly to rubber?
Yes. Evonik states that the grade can be co-vulcanized with selected rubbers without a separate adhesive or adhesion promoter.
Q4: Which rubbers can be used with VESTAMID X7099?
Evonik specifically identifies XNBR, HNBR, AEM and FPM/FKM families for direct-bonding plastic-rubber composite applications.
Q5: What is the density of VESTAMID X7099?
The typical density is approximately 1.20 g/cm³.
Q6: What is the tensile modulus?
The current dry tensile modulus is approximately 5,800 MPa according to ISO 527.
Q7: How heat resistant is VESTAMID X7099?
The grade has a melting temperature around 215°C, HDT around 190°C at 1.80 MPa and approximately 210°C at 0.45 MPa.
Q8: Is VESTAMID X7099 resistant to fuel and oil?
Yes. Evonik specifically identifies strong resistance to fuels, oils and greases.
Q9: What processing temperature is recommended?
Evonik’s PA612 processing guide lists approximately 230–270°C for X7099. The standardized ISO test-specimen melt temperature is 260°C, with an 80°C mold temperature.
Q10: What is the difference between VESTAMID X7099 and DX9321?
Both are 20% glass-fiber PA612 grades for plastic-rubber composites. DX9321 is specifically impact modified and provides higher notched impact strength, while VESTAMID X7099 is the standard direct-bonding PA612-GF20 grade.
Request VESTAMID X7099 Price & Technical Support
For pricing, availability, technical documents or application support for VESTAMID X7099, please provide:
- Required quantity
- Destination country or port
- Plastic-rubber composite application
- Rubber type: XNBR, HNBR, AEM, FPM/FKM or other
- Rubber formulation / cross-linking system
- Part dimensions
- Required stiffness
- Operating temperature
- Fuel, oil or grease exposure
- Required bond strength
- Injection-molding machine information
- Vulcanization temperature and cycle time
- TDS, SDS or COA requirements
- Sample requirement, if applicable
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