DPM-8628 Solvent-free high-temperature resistant methylsilicone resin

Overview

• This product is an organic silicone resin designed for room-temperature curing and high-temperature resistance, featuring a two-component room-temperature curing system with rapid surface drying at ambient temperature. It offers outstanding performance characteristics including excellent aging resistance, resistance to both high and low temperatures, high hardness, wear resistance, as well as color and surface gloss retention.
• The room-temperature curing high-temperature resistant silicone resin coating, formulated with DPM-8628, addresses the limitation inherent in other silicone resin products—where hardness and toughness cannot be simultaneously achieved—by offering superior overall performance. The cured coating, characterized by high hardness and high density, ensures exceptional thermal resistance, low permeability, and corrosion resistance, effectively isolating the metal surface from external factors such as water, air, and salts, thereby protecting it from environmental damage. Its high toughness ensures that the coating is resistant to cracking or delamination even under extreme conditions (e.g., acidic/alkaline environments, salt spray, or extreme temperatures), allowing for long-term durability and guaranteeing protective effectiveness for 20–30 years.
• DPM-8628 contains no VOCs and features a high solid content combined with low viscosity; the resulting coating can be applied by spraying or brushing without the need for any diluents, thereby complying with environmental protection regulations. It offers high hardness – up to 8H or higher – but to ensure adequate adhesion to the substrate, the coating thickness should not exceed 35 μm. The coating does not discolor at high temperatures.The room-temperature curing high-temperature resistant silicone resin coating overcomes the limitation of traditional high-temperature coatings (e.g., Teflon, inorganic coatings, solvent-based silicone resin coatings, water-based silicone resin coatings, etc.) that cannot cure at room temperature; it is therefore more suitable for application in outdoor construction environments where large-scale workpieces, equipment, pipelines, platforms, or units cannot be baked at high temperatures. DPM-8628 is packaged in separate Component A and Component B

Typical Characteristic

Test item	Reference standards	Data
Cross-hatched adhesion	GMW14669	After 168 hours – Level 0
surface hardness	Mitsubishi Pencil	After 168 hours, the value is greater than 8 H
glossiness	60°	Greater than 96°
High-humidity test	GMw14669	No surface change after 240 hours
Fuel-resistant	GMW14333-A	Level 2: No surface changes
Cyclic corrosion test	GMw14669	Severe condition (Level 9): <3 mm radial deformation
High humidity resistance to scratching	GMw14729	After 144 hours, a 5 N force cannot penetrate the coating.
filiform corrosion	GMW15287	No change; no fiber formation at the marked area.
Abrasion resistance	GMW14669	No aerosolized adhesions
Prohibited and Restricted Substances	GB/T30512	Lead, cadmium, and lead-benzophenanthroline levels are significantly below the standard limits.
Low-humidity impact resistance	ESOw3	No cracks or spalling
Detergent-resistant	GMw143334	Table 2: No swelling or dullness – Color change
1-year aging test / 96-hour humidity test / Adhesion test	GMw14873 14829	Final polishing gloss: 85°; Polishing durability: 92°
Durable resistance to washing and scratches	GMw14865	Equal to the control sample

Product Features

• High gloss and high hardness;
• High wear resistance and stain resistance;
• Oxidation resistance and aging resistance;
• Resistance to contamination and solvents;
• Resistance to acids, alkalis, salts, and detergents;
• Non-toxic, environmentally friendly, and cost-effective

Application Area

• Used for preparing colored paints; can be widely applied to stone, plastic, metal surfaces, painted areas, walls, and floors.
• Home appliances, cookware, stoves, fireplaces, ovens, kilns, flues, chimneys, vehicle exhaust pipes, and high-temperature resistant coatings for engines
• Weather-resistant, high-temperature resistant outdoor coating
• Household appliances (e.g., non-stick cookware coated externally), electronic and electrical components, and mechanical and electrical products – high-temperature resistant insulating coatings
• The most suitable base material for preparing high-temperature resistant insulation and thermal insulation coatings, fireproof coatings, heavy-duty anticorrosion coatings, thermal conductive coatings, etc.

Main parameter

Combination and Ratio		appearance	Solid content wt%	specific gravity g/cm3	Viscosity
					25℃ cps
DPM-8628 A/B	8628A	Colorless to pale yellow transparent liquid	>98	0.95-1.05	10月20日
A/B=100/2~5	8628B	Light yellow transparent liquid	>98	0.95-1.05	2月5日
Curing conditions: Recommended for ambient temperature curing (25°C); the material should be touch-dry within 1 hour, and its performance will reach optimal conditions after 7 days or more of curing; if heating is required to accelerate the curing process, low-temperature baking is recommended (e.g., 80–100°C for 30 minutes); the material will achieve optimal performance after 7 days of storage; please refer to the application test for specific requirements.

Method of use

1、Coating formulation
Pigments and fillers should be added to DPM-8628A and dispersed uniformly at high speed; before use, they should be thoroughly mixed with DPM-8628B. A diluent may be used to thin the resin as required; the exact amount of diluent to be added should be determined based on actual application requirements.Room-temperature curing high-temperature resistant coating formulation (Component A)：

Constituent	Mass fraction
DPM-8628A	100
high-temperature resistant rubber	22
mica flour	11
Low-melting-point glass powder（350℃）	22
High-purity zinc phosphate	11
KH560 silane coupling agent	1

production processes：

Disperse all components directly until a uniform mixture is obtained; it is recommended to disperse the mixture at 1200–1500 rpm for 45 minutes. During packaging, filter the mixture using a 200-mesh filter bag.

Room-temperature curing high-temperature resistant coating formulation (Component B)：DPM-8628B

Coating formulation ratio: Component A: Component B = 100:2–3

2、form of construction work

For the spray coating process, it is recommended to clean the substrate thoroughly before spraying – including degreasing and rust removal – and to sand the surface; increasing the substrate’s roughness will better enhance adhesion. The coating thickness should ideally be maintained between 25–35 μm; coatings that are too thick are prone to cracking at high temperatures.

3、condition of cure

Natural air-drying at room temperature: surface drying in 1 hour; achieves 8-hour drying time after 7 days; Low-temperature drying: bake at 80–100°C for 15–30 minutes to accelerate surface drying; To achieve maximum coating hardness and optimal performance, a minimum curing time of 7 days is required.

For the product after solvent addition, the appropriate drying temperature should be selected based on the solvent’s evaporation rate; for solvents with a high boiling point and slow evaporation rate, it is recommended to bake the product at 80–100°C to accelerate solvent evaporation. The residual solvent content will significantly affect the hardness and adhesion of the paint film.

Matters need attention

1.After pouring out the resin from the container, wipe away any excess resin from the container opening, tighten the bottle cap securely, and store the container in a cool place after sealing.
2.After use, brushes, spray guns, and similar tools should be promptly cleaned with a diluent for future use.
3.Open flames are strictly prohibited during construction; ensure proper ventilation.
4、This product has a slight odor and may cause mild irritation to the skin or eyes; if it accidentally comes into contact with the eyes, rinse immediately with plenty of water; if any discomfort occurs, seek medical attention at a hospital.
5、When the ambient temperature at the construction site is <15°C or the relative humidity is>75%, please proceed with the construction with caution.

Safety, Packaging and Storage

• Component A is packaged at 200 kg per barrel; store in a cool, dry place protected from light, with the storage temperature maintained between 5–25°C. Keep the packaging intact; the shelf life of both the main agent and the curing agent is 12 months. Component B must be stored in a tightly sealed container to prevent contact with moisture. 
•  Important Notice: The technical consultation information and instructions provided by our company – whether delivered orally, in writing, or as test reports – are intended as guidance for users and do not constitute any warranty. We cannot guarantee that a specific product is necessarily suitable for a particular application. Users are advised to test the product and its formulation to ensure they are appropriate for their specific process and intended use before deployment. Our company only guarantees the consistency of product quality.

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Disclaimer：The above information is provided based on the specific characteristics of our products and is derived from existing knowledge; it is intended solely as an introduction and usage recommendation for our products and does not constitute a warranty regarding the specific characteristics of our products when used in particular applications. Therefore, we assume no responsibility for this information or recommendations.