CAF 99 AXAD
CAF 99 AXAD Black — 2-component silicone, fast-curing (3–5 min pot life), black, up to +300 °C peak temperature. Ideal for oven doors, glass-ceramic cooktops, and ship portholes.
CAF 99 AXAD Black — 2-component silicone sealant, acetic acid-cured, black.
Fast curing at room temperature: pot life 3–5 min, touch-dry after 25–30 min. Also suitable for thick layers and in closed systems. Shore A 51, continuous use up to +250 °C, peak temperature +300 °C. For household appliances, oven doors, glass-ceramic cooktops, and ship portholes. From our Swiss warehouse.
documents
Internal reference:
40-351.KT
HS code:
39100000
CAF 99 AXAD Black – two-component high-temperature silicone rubber for rapid curing
CAF 99 AXAD Black from Elkem is a two-component silicone rubber that cures rapidly at room temperature. The chemical distinction is in the name: AXAD stands for "activated by X + acid"—a hybrid system in which an acetate-curing component (Part A, 90% by volume) is rapidly accelerated by an alcohol-based activator (Part B, 10%). Unlike traditional one-component silicones, which must rely on ambient humidity, curing in CAF 99 AXAD begins immediately after mixing—even in closed systems and at high film thicknesses that are unattainable for one-component products.
The pot life at room temperature is between 3 and 5 minutes; after 25 to 30 minutes, the part is cohesive enough for further processing. Curing can be further accelerated by applying heat (up to a maximum of +150°C)—at +100°C, nearly full Shore A hardness is achieved within one hour. The mechanical properties are designed for industrial applications: Shore A 51, tensile strength 4.3 MPa, tear strength 10 kN/m. The temperature resistance, ranging from −70 °C to +250 °C continuously and up to +300 °C peak, is among the best Elkem offers in this category.
What is CAF 99 AXAD Black typically used for?
The main areas of application are household appliances and glass bonding. In the white goods industry, CAF 99 AXAD is used for bonding and sealing stove gaskets, oven door hinges, oven door viewing windows, and glass-ceramic cooktops —in other words, wherever high temperatures and thermal cycling require reliable sealing. The second major application group involves bonding glass: typically ship portholes and cabin windows, where the product must simultaneously provide mechanical support while being heat-resistant and saltwater-resistant. Rapid curing even in thick joints is a decisive manufacturing advantage in both application groups—one-component silicones would take days to cure completely in such enclosed geometries and layers.
How should CAF 99 AXAD Black be applied correctly?
Despite its two-component chemistry, application is simple: The components are supplied pre-measured (9:1 volume ratio A:B) and mixed directly using a static mixer (single-use or reusable)—either manually via a two-component cartridge or automatically via a dispensing system. The similar viscosities of both parts ensure rapid, uniform mixing. CAF 99 AXAD is applied to one side of a clean, dry surface; the parts must be joined within the pot life before the material begins to set. Important: The joint should not be subjected to mechanical stress immediately—at room temperature, adhesion to aluminum does not reach 100% cohesive fracture until after 3 days. For stainless steel and plastics, a primary adhesion promoter (PM 131 or PM 820) is recommended.
Adhesion Performance and Long-Term Behavior
On aluminum AG3 (1 mm joint, without additional primer), CAF 99 AXAD achieves: 1.9 MPa (80% cohesive) after 1 day, 2.3 MPa (100% cohesive) after 3 days, and 2.7 MPa (100% cohesive) after 7 days. Even after heat aging at +250°C for 3 days, the bond strength remains at 2.5 MPa with 100% cohesive failure—this is the decisive proof for use in high-temperature applications such as oven door gaskets. The compression set after 7 days of compression at 125°C is only 35%—meaning the material largely returns to its original shape and remains permanently sealing.
Storage and Containers
CAF 99 AXAD Black can be stored in its unopened original packaging at temperatures between 2°C and +30°C for up to 18 months from the date of manufacture—longer than most one-component silicones, because the separate components do not initiate curing. Available in: 264 ml two-component cartridges (side-by-side, for static mixers), 30 l metal containers (9 containers of Part A + 1 container of Part B), 223 l drums for Part A for large production volumes. Complete set (9 x 1 L Part A + 3 x 310 mL Part B) available upon request.
CAF 99 AXAD Black is supplied by SILITECH AG with technical support, a batch certificate, and shipping from our Swiss warehouse within 24 hours.
Frequently Asked Questions About the CAF 99 AXAD Black
Answers regarding the 2K chemistry, processing, and high-temperature adhesion of CAF 99 AXAD Black silicone rubber.
AXAD stands for activated + acid —a two-component hybrid curing system consisting of a 90% acetate-crosslinking base and a 10% alcohol-based activator. Unlike 1K-CAFs such as CAF 1, which rely on atmospheric humidity, CAF 99 AXAD begins curing immediately after mixing, even in closed systems and with thick layers. This makes it the material of choice for thick joints, blind bonding, and high-throughput serial production.
The pot life at room temperature is 3 to 5 minutes. After 25 to 30 minutes, the part is cohesive enough for further processing. Applying heat (up to a maximum of +150°C) can significantly accelerate curing: at +100°C, nearly full Shore A hardness is achieved within just one hour.
The primary applications include household appliances subjected to high thermal loads (stove hinges, oven door hinges, viewing window gaskets, glass-ceramic cooktops) and glass bonding (ship portholes, cabin windows). In both cases, the combination of rapid curing at room temperature, high temperature resistance (+250°C continuous, +300°C peak), and good mechanical properties is crucial.
On AG3 aluminum, CAF 99 AXAD achieves 2.7 MPa with 100% cohesive fracture after 7 days at room temperature. After additional aging at +250°C for 3 days, the strength drops to 2.5 MPa—but the fracture remains 100% cohesive. This is the decisive proof of suitability for long-term use in furnace doors and other high-temperature applications.
product specifications
| Physical properties | |
|---|---|
| Paint cured | Black |
| Self-leveling | No |
| consistency | Thixotropic |
| product information | |
|---|---|
| brand | CAF |
| network type | Two-component (acetate-activated) |
| manufacturer | Elkem Silicones |
| Number of components | 2K (two-component) |
| mixing ratio | 9:1 |
| container | 301 g |
| Additional features | |
|---|---|
| UV resistance | No |
| product approvals | |
|---|---|
| food contact | No |
| Suitable for medical use | No |
| Areas of application | |
|---|---|
| Main application | Sealing & Joints or Adhesives |
| Electrical Properties | |
|---|---|
| Electrical insulation | Yes |
| keywords | |
|---|---|
| keywords | |
| Mechanical properties | |
|---|---|
| Shore A hardness | 51.0 Shore A |
| Modulus at 100% elongation | 2.3 MPa |
| tensile strength | 4.3 MPa |
| elongation at break | 235.0 % |
| Tear resistance | 10.0 kN/m |
| processing | |
|---|---|
| Pot life at 23°C | 4.0 min |
| Physical & Thermal | |
|---|---|
| Density (23°C) | 1.15 g/cm³ |
| Temperature resistance (duration) | -70 to 250 °C |
| Peak temperature (short-term) | 300 °C |
| thermal conductivity | 0.25 W/(m·K) |
| Electrical specifications | |
|---|---|
| Dielectric constant ε (1 kHz) | 3.2 |
| Dielectric strength | 18.0 kV/mm |
| Forward resistance | 2e+15 Ω·cm |
| Loss factor tan δ | 0.004 |
| storage | |
|---|---|
| Shelf life in original packaging | 18 months |
| Storage temperature | 2 to 30 °C |