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Review side-by-side product details, technical notes, and practical differences.

Product comparison

Origin Pro HP3 vs DOWSIL 999-A Building and Glazing Sealant

A Practical Comparison for Window, Door & Siding Professionals
Sellador exterior de silicona 100 % HP3 (curado con acetoxi)

Origin Pro

Sellador exterior de silicona 100 % HP3 (curado con acetoxi)

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DOWSIL™ 999-A Building and Glazing Sealant

Compared with

DOWSIL™ 999-A Building and Glazing Sealant

Core Performance & Application Attributes

Sealant Technology

Sellador exterior de silicona 100 % HP3 (curado con acetoxi)

Premium Neutral-Cure (Alkoxy) RTV Silicone

DOWSIL™ 999-A Building and Glazing Sealant

One-Part Acetoxy RTV Silicone
Product Class & Movement (ASTM C920)

Sellador exterior de silicona 100 % HP3 (curado con acetoxi)

ASTM C920 – Class 50 (±50% Joint Movement)

DOWSIL™ 999-A Building and Glazing Sealant

ASTM C920 – Class 25
Skin Formation / Tack-Free Performance

Sellador exterior de silicona 100 % HP3 (curado con acetoxi)

Skins in approximately 20–30 minutes. Tack-free in approximately 30 minutes. Full cure approximately 24 hours.

DOWSIL™ 999-A Building and Glazing Sealant

Tooling time approximately 5–10 minutes. Tack-free in approximately 10–20 minutes.
Application Temperature Range

Sellador exterior de silicona 100 % HP3 (curado con acetoxi)

40°F to 100°F

DOWSIL™ 999-A Building and Glazing Sealant

Not published in the provided TDS.

Comparative Overview

Both HP3 and DOWSIL™ 999-A are professional 100% silicone sealants designed for demanding construction sealing applications.

αβγ προσωρινό comparative overview
αβγ προσωρινό comparative overview

Differences You’ll Notice

HP3 utilizes neutral-cure (alkoxy) silicone technology, while DOWSIL™ 999-A utilizes acetoxy-cure silicone technology. HP3 meets ASTM C920 Class 50 requirements compared with Class 25 for DOWSIL™ 999-A. HP3 provides ±50% joint movement capability and is specifically positioned for professional window, door, siding and trim applications. HP3's neutral-cure formulation is non-corrosive, while Dow specifically limits DOWSIL™ 999-A on surfaces sensitive to corrosion from acetic-acid cure vapors. HP3 is available through flexible contractor and dealer purchasing programs with delivery directly to your shop or jobsite.

Ready to Make the Switch?

Premium neutral-cure silicone technology. ASTM C920 Class 50 performance. ±50% joint movement capability. Non-corrosive formulation. Direct online ordering. Delivered to your shop or jobsite.

Beyond the Product Direct Online Ordering · Flexible Ordering Options · Pro Dashboard
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Product Comparison Disclaimer

Product comparison information is based on publicly available technical data published by the respective manufacturers and available at the time of review. Comparisons are provided for general informational purposes only and do not imply product equivalence, specification approval, certification, or suitability for any particular application.

Product names, trademarks, packaging, and images are the property of their respective owners and are used solely for identification and comparative purposes. Legacy Sealants, Inc. and Origin Pro are not affiliated with, sponsored by, or endorsed by any referenced manufacturer.

Product formulations and specifications may change. Users should review current manufacturer technical literature and independently determine product suitability for their specific application.

All third-party trademarks are the property of their respective owners. Their use is solely for identification and comparative purposes and does not imply affiliation, sponsorship, or endorsement.