HTP
GUIDE
HTP-301
HTP-301 is the specific latent hardener based on Dicyandiamide, the most widely used epoxy resin hardener for curing at elevated temperature. Its applications extend from composite materials to structural adhesives, from electrical laminates to powder coatings.
At moderate temperatures, general Dicyandiamide does not react with epoxy resins. This is because of the low basicity and poor solubility in epoxy resins. At the elevated temperatures, better solubility in epoxy resins becomes more important. Since the large grain size of Dicyandiamide frequently forms inclusions, it can cause the workpiece with defects till failure.
HTP-301 is an ultramicronized Dicyandiamide that has higher reactivity, no unreacted inclusions with large unreacted particles, no mechanical failure and no surface defects on coatings.
Typical properties:
Appearance: White powder (150mesh averagely)
Moisture: 0.30%max
Melting point: 209-212℃
Reacting ratio with solid epoxy resin (EEW ~750) 100/6—8
Unlimited storability in a dry place without chemical decomposition at the temperature under 20℃Long storage may result in caking but without chemical change within two years after the manufacturing date.
Package: 30kg/paper drum with plastic bag
HTP-302
HTP-302 is a special latent hardener based on Dicyandiamide with uncaking form with exactly same properties of HTC-301. It has better flow property. It can be stored at the temperature under 20℃ and used in all applications in which HTC-301 is used except for clear coating since there is a tiny portion of anti-caking agent used.
Typical properties:
Appearance: White powder (150mesh averagely)
Moisture: 0.30%max
Melting point: 209-212℃
Reacting ratio with solid epoxy resin (EEW ~750) 100/6—8
Unlimited storability in a dry place without chemical decomposition at the temperature under 20℃. Long storage may result in caking but without chemical change within two years after the manufacturing date.
Package: 30kg/paper drum with plastic bag
HTP-303
HTP-303 and HTP-305 are phenolic hydroxyl terminated solid granuled hardeners for functional and decorative epoxy powder coatings. HTP-305 contains 2-methylimidazole that functions as an accelerator to reduce the cure cycle. HTP-303 contains no accelerator. These two special hardeners are widely used for steel rebar powder coatings with extreme flexibility and elongation. It also is suitably used in pipe coating to get excellent chemical resistance.
Typical properties: HTP-303
Physical form Granule Granule
Phenolic hydroxyl (eq/100g) 0.36-0.40
Viscosity (cP, at 25°C1) 5.5-8.5
Color (Platinum-Cobalt2) 100 max
Density (grams/cm3)3 1.18
2-Methylimidazole (% by weight) None
With the ratio of 100 parts (EEW~750) 36.9
With the ratio of 100 parts (EEW~915) 28.6
1. Determined on a 40% by weight solution in MEK. ASTM D-445 (Kinematic Viscosity at 25 °C).
2. Determined on a 40% by weight solution in MEK. ASTM D-1209 (Test for Platinum-Cobalt Color).
3. Powder Coating Institute (PCI) recommended procedure #4, Density of Powder Coating Materials.
Packaging, Storage and Shipping
HTP-303 & HTP-305 are considered stable materials produced in granule form and packaged in 50kg net fiber drums with a plastic bag to minimize moisture pick-up.
Shelf life: At least 2 years when stored it in a cool place (<50°C) without sunlight affecting.
HTP-305
HTP-303 and HTP-305 are phenolic hydroxyl terminated solid granuled hardeners for functional and decorative epoxy powder coatings. HTP-305 contains 2-methylimidazole that functions as an accelerator to reduce the cure cycle. HTP-303 contains no accelerator. These two special hardeners are widely used for steel rebar powder coatings with extreme flexibility and elongation. It also is suitably used in pipe coating to get excellent chemical resistance.
Typical properties: HTP-303 HTP-305
Physical form Granule Granule
Phenolic hydroxyl (eq/100g) 0.37-0.42
Viscosity (cP, at 25°C1) 5.5-8.5
Color (Platinum-Cobalt2) 100 max
Density (grams/cm3)3 1.18
2-Methylimidazole (% by weight) 2.0 ± 0.1
With the ratio of 100 parts (EEW~750) 28.4
With the ratio of 100 parts (EEW~915) 22.1
1. Determined on a 40% by weight solution in MEK. ASTM D-445 (Kinematic Viscosity at 25 °C).
2. Determined on a 40% by weight solution in MEK. ASTM D-1209 (Test for Platinum-Cobalt Color).
3. Powder Coating Institute (PCI) recommended procedure #4, Density of Powder Coating Materials.
Packaging, Storage and Shipping
HTP-303 & HTP-305 are considered stable materials produced in granule form and packaged in 50kg net fiber drums with a plastic bag to minimize moisture pick-up.
Shelf life: At least 2 years when stored it in a cool place (<50°C) without sunlight affecting.
HTP-306
HTP-306 and HTP-307 are products from the reaction between the special epoxy resin and imidazole. They could be used as a sole hardener or as an accelerated curing agent with other materials, such as dicyandiamide. HTP-306 can be used to prepare both fast curing functional powders and low temperature cure decorative powders because of its finely divided powder form. The small granule form of HTP-307 is also available for customers who want to grind/mix it into their formulations for functional powder coating applications.
HTP-306 and HTP-307 are normally used at per hundred (portions of) resin (phr) about 2-4 parts of solid epoxy resin (EEW~750).
They should be melt compounded under low temperature and high shear conditions to limit pre-curing, reach best dispersion and minimize the formation of gel particles since HTP-306 & HTP-307 are very reactive in formulations. The possibility for gel formation increases if the hardener is not well mixed before the start of the melt compounding step. Therefore, HTP-307 is not recommended for thin film decorative applications, unless it is powdered just before it is used.
Typical properties:
Alkalinity1 Viscosity2 Melt point3 Density4 Package
HTP-306
Imidazole adduct 3.5-3.9 25-35 85-105 1.15-1.17 35kg/drum
HTP-307
Granule form of HTP-306 3.5-3.9 25-35 85-105 1.15-1.17 35kg/drum
1. ASTM D 2896 (Amine Nitrogen and Amine Value by Potentiometric Perchloric Acid Titration
2. Poise at 150 oC.
3. Mettler melt point, oC.
4. Grams/ml at 25 oC, Powder Coating Institute Test Procedure #4.
Storage and Handling
All of these products are physical stable if properly handled. They keep in a free-flowing powder or small granule form, with careful inventory management, shipping and storage to avoid exposure to high temperature and moisture. Exposure to excessively high temperature, greater than about 25°C, or high humidity conditions, can lead to some caking/solidification. While this caking does not mean that properties of curing agents are chemically changed, it is important that they be in their original form, either a finely ground powder or small granule, so they can be uniformly dispersed into the powder coating systems. Non-uniform dispersion could lead to powder coatings with inconsistent performance and/or gel particles. If refrigerated storage is used, the products should be allowed to come to room temperature before using in order to prevent excessive moisture pick-up from condensation.
HTP-307
HTP-306 and HTP-307 are products from the reaction between the special epoxy resin and imidazole. They could be used as a sole hardener or as an accelerated curing agent with other materials, such as dicyandiamide. HTP-306 can be used to prepare both fast curing functional powders and low temperature cure decorative powders because of its finely divided powder form. The small granule form of HTP-307 is also available for customers who want to grind/mix it into their formulations for functional powder coating applications.
HTP-306 and HTP-307 are normally used at per hundred (portions of) resin (phr) about 2-4 parts of solid epoxy resin (EEW~750).
They should be melt compounded under low temperature and high shear conditions to limit pre-curing, reach best dispersion and minimize the formation of gel particles since HTP-306 & HTP-307 are very reactive in formulations. The possibility for gel formation increases if the hardener is not well mixed before the start of the melt compounding step. Therefore, HTP-307 is not recommended for thin film decorative applications, unless it is powdered just before it is used.
Typical properties:
Alkalinity1 Viscosity2 Melt point3 Density4 Package
HTP-306
Imidazole adduct 3.5-3.9 25-35 85-105 1.15-1.17 35kg/drum
HTP-307
Granule form of HTP-306 3.5-3.9 25-35 85-105 1.15-1.17 35kg/drum
1. ASTM D 2896 (Amine Nitrogen and Amine Value by Potentiometric Perchloric Acid Titration
2. Poise at 150 oC.
3. Mettler melt point, oC.
4. Grams/ml at 25 oC, Powder Coating Institute Test Procedure #4.
Storage and Handling
All of these products are physical stable if properly handled. They keep in a free-flowing powder or small granule form, with careful inventory management, shipping and storage to avoid exposure to high temperature and moisture. Exposure to excessively high temperature, greater than about 25°C, or high humidity conditions, can lead to some caking/solidification. While this caking does not mean that properties of curing agents are chemically changed, it is important that they be in their original form, either a finely ground powder or small granule, so they can be uniformly dispersed into the powder coating systems. Non-uniform dispersion could lead to powder coatings with inconsistent performance and/or gel particles. If refrigerated storage is used, the products should be allowed to come to room temperature before using in order to prevent excessive moisture pick-up from condensation.
HTP-308
HTP-308 and HTP-309 are accelerated dicyandiamide types. They react with epoxy resins through both catalytic and addition type reaction of the dicyandiamide portion. HTP-308 is normally used for thick film decorative or functional powder coatings. HTP-309 is normally used to prepare thin film decorative powders. These curing agents can be used individually or in combination to formulate a wide variety of powder coatings designed for specific applications.
HTP-308 and HTP-309 are normally used at per hundred (portions of) resin (phr) about 4-6 parts of solid epoxy resin (EEW~750). Although HTP-308 and HTP-309 are less sensitive to pre-curing and gelation than HTP-306 and HTP-307, good pre-dispersion and moderate extrusion temperatures generally lead to improved appearance and performance.
Typical properties:
Alkalinity1 Density2 Package
HTP-308 Accelerated dicyandiamide 1.7-2.2 1.26-1.27 30kg/drum
HTP-309 Accelerated dicyandiamide 0.6-0.8 1.37-1.38 30kg/drum
1. ASTM D 2896 (Amine Nitrogen and Amine Value by Potentiometric Perchloric Acid Titration
2. Grams/ml at 25 oC, Powder Coating Institute Test Procedure #4.
Storage and Handling
All of these products are physical stable if properly handled. They keep in a free-flowing powder or small granule form, with careful inventory management, shipping and storage to avoid exposure to high temperature and moisture. Exposure to excessively high temperature, greater than about 25°C, or high humidity conditions, can lead to some caking/solidification. While this caking does not mean that properties of curing agents are chemically changed, it is important that they be in their original form, either a finely ground powder or small granule, so they can be uniformly dispersed into the powder coating systems. Non-uniform dispersion could lead to powder coatings with inconsistent performance and/or gel particles. If refrigerated storage is used, the products should be allowed to come to room temperature before using in order to prevent excessive moisture pick-up from condensation.
HTP-309
HTP-308 and HTP-309 are accelerated dicyandiamide types. They react with epoxy resins through both catalytic and addition type reaction of the dicyandiamide portion. HTP-308 is normally used for thick film decorative or functional powder coatings. HTP-309 is normally used to prepare thin film decorative powders. These curing agents can be used individually or in combination to formulate a wide variety of powder coatings designed for specific applications.
HTP-308 and HTP-309 are normally used at per hundred (portions of) resin (phr) about 4-6 parts of solid epoxy resin (EEW~750). Although HTP-308 and HTP-309 are less sensitive to pre-curing and gelation than HTP-306 and HTP-307, good pre-dispersion and moderate extrusion temperatures generally lead to improved appearance and performance.
Typical properties:
Alkalinity1 Density2 Package
HTP-308 Accelerated dicyandiamide 1.7-2.2 1.26-1.27 30kg/drum
HTP-309 Accelerated dicyandiamide 0.6-0.8 1.37-1.38 30kg/drum
1. ASTM D 2896 (Amine Nitrogen and Amine Value by Potentiometric Perchloric Acid Titration
2. Grams/ml at 25 oC, Powder Coating Institute Test Procedure #4.
Storage and Handling
All of these products are physical stable if properly handled. They keep in a free-flowing powder or small granule form, with careful inventory management, shipping and storage to avoid exposure to high temperature and moisture. Exposure to excessively high temperature, greater than about 25°C, or high humidity conditions, can lead to some caking/solidification. While this caking does not mean that properties of curing agents are chemically changed, it is important that they be in their original form, either a finely ground powder or small granule, so they can be uniformly dispersed into the powder coating systems. Non-uniform dispersion could lead to powder coatings with inconsistent performance and/or gel particles. If refrigerated storage is used, the products should be allowed to come to room temperature before using in order to prevent excessive moisture pick-up from condensation.