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chem99.com

https://chem99.com· First analyzed 17 May 2026· Updated 17 May 2026
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chem99.com
Desktop screenshot of chem99.com
Mobile screenshot of chem99.com
Mobile

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Hosting Provider

Chinanet SD

IP Address

58.57.118.4

Site Location

🇨🇳 Chinavia ip

Server Location

🇨🇳 Jinan, China

ASN

AS4134

Organization

Chinanet SD

Server

Nginx

Nameservers

ns2.dnsv2.com.ns1.dnsv2.com.

Performance

81

Core Web Vitals

Weight

First Contentful Paint
2.1 s10%
Speed Index
2.8 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
752 KB
108 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Chinanet SD

Technology Stack

4 Technologies Detected

Libraries

1
jQueryv1.9.1

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Nginx

Frameworks

1
ASP.NET

SEO Analysis

F38/100
9
12
3
Meta Tags7/15
Content9/12
Headings0/8
Technical7/25
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile1/4
Indexability3/3
C
chem99.comchem99.com

卓创资讯化工 - 化工行业资讯门户网站

提供石油、化工、塑料、橡胶、天然气、化纤、煤炭等多个门类、几百个小类、上万种产品的行情资讯；旨在为行业内企业的经营运作提供资讯与商机，辅助企业决策和决策的执行。

Title Length19 chars

Recommended: 50-60 chars (~117px / 580px)

Description Length80 chars

Recommended: 120-160 chars

Issues (3)

  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (40/46) — critical for accessibility and SEO
  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

15 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

18 rules

Local SEO

Local Search Readiness

3/100
Poor
1 14 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

F29/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
0/25
Citation
1/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
def. lists
Text ratio:6%
Words:390
Token eff.:Optimal
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary
Descriptive Headings
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
AI readiness recommendation preview...
Upgrade to view recommendations

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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
D
42/100
5
Passed
6
Critical
2
Warnings
Images & Alt Text
5/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
3/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
10/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
0/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
6 recommendations
  • •Accessibility recommendation preview...
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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
39/100
B
93 mg
CO₂e / view
752.5 KB
Page Weight
80%
Cleaner Than
New Visitor
106 mg
vs
Returning (cached)
53 mg
Annual (10K/mo)
11.2 kg
Emission Segments
Data Center
21 mg
Network
22 mg
Device
50 mg
Resource Breakdown
Images
420.2 KB
CSS
323.0 KB
HTML
9.2 KB
Green Hosting Not Verified
Chinanet SD
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
F

Security Score

21%Critical
Interactive

HTTPS

No WAF

181d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

WoTrus CA Limited

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

14.10.2025

Valid Until

14.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.chem99.comchem99.com

SHA-256 Fingerprint

74:2F:43:C8:12:63:0A:06:7F:78:43:03:0A:92:C7:A8:21:6D:99:12...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🔴 No Cache(public, no-cache="Set-Cookie", max-age=60)
content-encoding
📦 Gzip(gzip)
content-type
text/html; charset=gb2312
date
Sun, 17 May 2026 11:40:01 GMT
expires
Sun, 17 May 2026 11:41:01 GMT
last-modified
Sun, 17 May 2026 11:40:01 GMT
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

45

SPF
DKIM
DMARC

MX Records (4)

cdn.corpemail.net
cdn.corp-email.cn
mail.biz-email.net
cnc.biz-email.net

Domain Information

chem99.com

Domain Age
22y 2m

Created

28.02.2004

Expires

28.02.2028

Last Updated

14.02.2025

Registrar

Xiamen 35.com Information Co., Ltd.

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
F
35/100
Not Mobile Friendly1 breakpoint
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
4 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

宋体

WCAG Partial
46/100
Readability
/30
9/30

11px · LH 2.00

Hierarchy
/20
9/20
WCAG
/25
14/25

1.95:1 min contrast

Performance
/25
14/25

1 font

Heading Font

宋体

Body Font

宋体

Sans11px

Contrast Ratio

1.95:1

23 issues

Reading Comfort

~86 CPL

Wide lines
11px
p

❌ Critical: 11px body text is too small. Minimum 14px, recommend 16px+.

⚠️ Wide line spacing (2.00). 1.4–1.6 is optimal for body text.

⚠️ Wide lines: ~86 chars/line. Use max-width: 65ch for comfortable reading.

⚠️ Partial contrast: 23 elements below WCAG AA threshold (min 1.9:1).

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFonts

Color Palette

10 unique colors
2.33:1 Fail Light
#ffffff
Background· 30.2%
#a7aaae
Other· 6.3%
#ff9600
Primary· 18.7%
#f2efec
Secondary· 13.100000000000001%
#153b71
Accent· 8.7%
#4a7dc0
Secondary· 7.8%
#dde2e6
Border· 7%
#de7e22
Accent· 5.4%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

13 Resources

9
Scripts
4
Styles
2
Async
0
Defer

Top Script Sources

img.sciimg.com(2)cbjs.baidu.com(2)libat-old.sci99.com(1)newuser.test.sci99.com(1)hm.baidu.com(1)

Website Identity

chem99.com

22 years old
Location detected: 🇨🇳 Chinavia ip
Xiamen 35.com Information Co., Ltd.

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Last analyzed: 17 May 2026 at 11:40

Historical Analysis & Change Tracking