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ORIGIN PRO COMPARE
Origin Pro HP4 vs. NPC™ Solar Seal® #900
Compared with
NPC™ Solar Seal® #900
At a Glance
HP4 and NPC Solar Seal #900 are professional ASTM C920 Class 25 sealants used for exterior siding, window, roofing and flashing applications. Both publish application down to 0°F, while HP4 publishes faster tack-free and complete-cure times and supports application to clean, dry or damp surfaces.
| What Matters on the Job | Origin Pro HP4 | NPC™ Solar Seal® #900 |
|---|---|---|
| ASTM C920 Class 25 | ✓ Yes | ✓ Yes - except weight loss |
| Application Down to 0°F | ✓ Yes | ✓ Yes |
| Tack-Free Within 60 Minutes | ✓ Yes - 30-60 minutes | ✕ No - 4 hours |
| Published Cure of 24-72 Hours | ✓ Yes - 24-72 hours | ✕ No - 21 days |
| Damp-Surface Application | ✓ Yes - clean, dry to damp | ✕ No - clean, dry and frost-free |
View Detailed Specifications
| Attribute | Origin Pro HP4 | NPC™ Solar Seal® #900 |
|---|---|---|
| Sealant Technology | Advanced hybrid polymer (SMP / MS polymer) | Terpolymer elastomer / adhesive sealant |
| ASTM C920 Classification | Class 25 | Class 25 |
| Movement Capability | ±25% | Class 25 (±25%) |
| Application Temperature | 0°F to 120°F | 0°F to 125°F |
| Service Temperature | -40°F to 200°F | -40°F to 300°F |
| Tack-Free Time | Approximately 30-60 minutes | 4 hours - ASTM C679 |
| Complete Cure | 24-72 hours | 21 days at 75°F |
| Application Surface Condition | Can be applied to clean, damp surfaces after standing water is removed. Do not apply to saturated substrates. | Temperate, clean, dry and frost-free |
| Cool-Weather Preparation | No tube warming stated | TDS instructs: Warm tubes in cool weather |
| Paintable | Paintable after skin formation; test paint compatibility before finishing. | Yes, after skin forms |
| Cartridge Size | 10.1 fl oz | 10.3 oz consumer size; 19 oz pro size |
| Cartridge Construction | Plastic cartridge | Spiral-wound paperboard cartridge |
| Nozzle Options | V-notch nozzle and standard 4.25-inch nozzle | Standard cartridge nozzle |
| Color Matching | 3,500+ color matches; custom matching available | More than 200 standard colors plus custom colors |
| Published Applications | Windows, doors, siding, trim and exterior transitions | Siding and windows, roofing, flashing, masonry, architectural metals and other exterior materials |
| Direct Online Ordering | Yes - through Origin Pro | No - manufacturer states products are sold through wholesale building-product distributors |
| Pro Dashboard Tools | Yes - pricing, saved colors, projects and order history | No comparable NPC account dashboard identified |
Published manufacturer specifications are shown as stated in the applicable technical data sheets.
Differences You Will Notice
Both HP4 and NPC Solar Seal #900 meet ASTM C920 Class 25 requirements and publish application down to 0°F. On the job, HP4 becomes tack-free in approximately 30-60 minutes versus 4 hours for Solar Seal #900 and publishes a 24-72 hour complete cure versus 21 days. HP4 can also be applied to clean, dry or damp surfaces, while the Solar Seal #900 TDS calls for a clean, dry and frost-free surface and recommends warming tubes in cool weather. Origin Pro makes buying easier through direct online ordering and Pro Dashboard tools for pricing, saved colors, projects and past orders.
Beyond the Product
Origin Pro’s Pro Dashboard makes buying simpler, faster and more organized. See pricing before you order, find and save color matches, track projects and past orders, and quickly reorder—all in one place.
Product Comparison Information
These comparisons are intended to help contractors evaluate differences in product features and manufacturer-published specifications when considering products for a particular application. Unless expressly stated, Legacy Sealants, Inc. has not conducted head-to-head testing of the referenced products. Information is drawn from manufacturer technical literature identified on the page and was available as of the date shown. Because test methods and conditions may differ by manufacturer, published values should not be treated as directly equivalent unless specifically noted.
Product names, trademarks, packaging and images are the property of their respective owners and are used solely to identify the products being compared. Legacy Sealants, Inc. is 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.
Trademark Ownership
NPC™ is a trademark and Solar Seal® is a registered trademark of Nu-Puttie Corporation, operating as NPC Sealants.
Technical Literature
Origin Pro HP4 High Performance Hybrid Polymer Sealant Technical Data Sheet, version dated September 24, 2026. NPC Solar Seal® #900 Terpolymer Elastomer / Adhesive Sealant Technical Data Sheet, dated June 2016. NPC product and ordering pages were reviewed September 24, 2026 for current product availability, colors and ordering information.