Sigma Plastics Group
(https://alpha-industries.com) 📸 Data Snapshot: May 29, 2026Inspect the JSON-LD. Is there an Organization or Person schema, and does it carry sameAs links to real external profiles (LinkedIn, socials)? Missing schema or no identity declaration signals an anonymous entity.
There is a significant authority gap regarding the leadership and expertise within the company, as no individual founders, engineers, or executives are named or linked via Person schema. The schema_json is limited to WebPage and WebSite types, missing the Organization schema that would typically house sameAs links to official corporate registries or social profiles. Additionally, the technical credibility is slightly undermined by the absence of an H1 on the homepage and the zeroed-out counter data (0Million lbs. silo storage) found in the clean text, suggesting neglected maintenance of key performance indicators.
The site makes bold performance claims regarding its status as North America’s largest privately held film manufacturer, but provides no third-party citations or industry reports to verify this rank. While the location count is verifiable through the list provided, the claim of excellence in reliability lacks a published uptime metric or delivery-in-full-on-time (DIFOT) percentage. The disconnect lies between the massive scale claimed (2 billion lbs) and the relatively thin description of the quality management systems that govern that production.
Identity & Authority is read from the structured data first: whether the site declares who it is in machine-readable schema, with verifiable identity links. Below is the schema captured per page, then the external proof links that support (or fail to support) that identity.
🔗 Identity & Technical Layer — schema JSON-LD: identity chains, entity gaps
Homepage schema
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebPage",
"@id": "https://www.sigmaplasticsgroup.com/",
"url": "https://www.sigmaplasticsgroup.com/",
"name": "Home",
"isPartOf": {
"@id": "https://www.sigmaplasticsgroup.com/#website"
},
"datePublished": "2018-11-15T02:00:39+00:00",
"dateModified": "2022-07-07T16:58:23+00:00",
"description": "Sigma Plastics Group of Companies is North America’s largest film manufacturer and producer extruded polyethylene products US-Canada.",
"breadcrumb": {
"@id": "https://www.sigmaplasticsgroup.com/#breadcrumb"
},
"inLanguage": "en-US",
"potentialAction": [
{
"@type": "ReadAction",
"target": [
"https://www.sigmaplasticsgroup.com/"
]
}
]
},
{
"@type": "BreadcrumbList",
"@id": "https://www.sigmaplasticsgroup.com/#breadcrumb",
"itemListElement": [
{
"@type": "ListItem",
"position": 1,
"name": "Home"
}
]
},
{
"@type": "WebSite",
"@id": "https://www.sigmaplasticsgroup.com/#website",
"url": "https://www.sigmaplasticsgroup.com/",
"name": "Sigma Plastics",
"description": "Quality, Innovation, and Expertise in Flexible Packaging",
"potentialAction": [
{
"@type": "SearchAction",
"target": {
"@type": "EntryPoint",
"urlTemplate": "https://www.sigmaplasticsgroup.com/?s={search_term_string}"
},
"query-input": {
"@type": "PropertyValueSpecification",
"valueRequired": true,
"valueName": "search_term_string"
}
}
],
"inLanguage": "en-US"
}
]
}
/sigmaPlastics2/locations/
{
"@context": "https://schema.org",
"@graph": [
{
"@type": "WebPage",
"@id": "https://www.sigmaplasticsgroup.com/locations/",
"url": "https://www.sigmaplasticsgroup.com/locations/",
"name": "Locations",
"isPartOf": {
"@id": "https://www.sigmaplasticsgroup.com/#website"
},
"datePublished": "2018-11-15T02:13:20+00:00",
"dateModified": "2022-07-07T17:14:11+00:00",
"description": "Sigma Plastics Group of Companies includes Aargus, Allied, Beta, Coastal Films, Emballage Performant, Epsilon, Filmtech, IsoFlex Packaging, McNeely, Mercury, New Excelsior, Omega, Performance Packaging, Poly Plastic, Reliance, Republic Bag, Sigma Stretch Film, Southeastern, Tara.",
"breadcrumb": {
"@id": "https://www.sigmaplasticsgroup.com/locations/#breadcrumb"
},
"inLanguage": "en-US",
"potentialAction": [
{
"@type": "ReadAction",
"target": [
"https://www.sigmaplasticsgroup.com/locations/"
]
}
]
},
{
"@type": "BreadcrumbList",
"@id": "https://www.sigmaplasticsgroup.com/locations/#breadcrumb",
"itemListElement": [
{
"@type": "ListItem",
"position": 1,
"name": "Home",
"item": "https://www.sigmaplasticsgroup.com/"
},
{
"@type": "ListItem",
"position": 2,
"name": "Locations"
}
]
},
{
"@type": "WebSite",
"@id": "https://www.sigmaplasticsgroup.com/#website",
"url": "https://www.sigmaplasticsgroup.com/",
"name": "Sigma Plastics",
"description": "Quality, Innovation, and Expertise in Flexible Packaging",
"potentialAction": [
{
"@type": "SearchAction",
"target": {
"@type": "EntryPoint",
"urlTemplate": "https://www.sigmaplasticsgroup.com/?s={search_term_string}"
},
"query-input": {
"@type": "PropertyValueSpecification",
"valueRequired": true,
"valueName": "search_term_string"
}
}
],
"inLanguage": "en-US"
}
]
}
🛡️ Trust Signals — external proof links that back the declared identity
| Page | Reviews | Proof links |
|---|---|---|
| / (home) | 8 | 0 |
| /sigmaPlastics2/locations/ | 8 | 0 |
This page presents a snapshot of public data from Sigma Plastics Group, captured on May 29, 2026, to show how machine logic reads Identity & Authority signals into an AI reputation evaluation.
Purpose: This data is presented under “Fair Use” for the purpose of independent signal analysis, allowing readers to see the raw signals behind the reputation score.
Notice to Sigma Plastics Group: This analysis is part of a non-adversarial audit conducted by 1 Euro SEO. The results are intended as professional feedback to help improve any website’s machine-readability and authority signals. The evaluation is free, and any company can request a fresh audit at any time.
Any company can use the insights for free and improve its voice. When a company has updated its content, it can always submit a new audit request, which will be reflected in a new current score.
To all users: You are encouraged to visit the live site at https://alpha-industries.com to view the most current version of its content and see directly what this company is about and what it offers.