Internal Floating Roof Seals - Primary Seals

Comparison Chart



HMT offers multiple primary seal options for internal floating roof tanks. Each seal is customized to fit to the tank to ensure non-gapping performance, long life and safe operation. Internal primary seals include a variety of configurations, component sizes and material options to handle any application and stored product.

Compare HMT’s Internal Floating Roof Primary Seals

Contact an HMT sales rep to discuss which one is right for your application.

Internal Floating Roof Seals - Primary

Foam Log


Liquid Filled


Flip Flop Wiper

MINI-SHOE™
(for Aluminum roofs)*

MINI-SHOE™
(for Steel roofs)

Retro-Fit Shoe
(for lightweight aluminum roofs)

Scissor Shoe**

SealMaster™ǂ

Conforms to shell roundness anomalies Good - with limited range Good - with limited range Average - with limited range Good Good Good Excellent Excellent
Chemical compatibility Average Average Average Excellent Excellent Excellent Excellent Excellent
Pressure distribution on shoe N/A N/A N/A 6 points 6 points 6 points 9 points Uniform pressure with full contact
Roof centering capabilities None None Limited Good Good Good Excellent Excellent
Abrasion resistance Not Recommended Not Recommended Not Recommended Excellent Excellent Excellent Excellent Excellent
Life expectancy Not Recommended Not Recommended Not Recommended Excellent Excellent Excellent Excellent Excellent
Applicable guidelines API 650 API 650 API 650 API 650 API 650 API 650 API 650 EEMUA 159, EN 14015, API 650
Capable of handling waxy shell residue N/A N/A N/A With wax scrapers use scissor hangers With wax scrapers use scissor hangers N/A With wax scrapers With wax scrapers
Available with riveted tank option N/A N/A Can be used for riveted tanks Use scissor hangers Use scissor hangers N/A

*For heavy duty aluminum roofs and UNIDECK® roofs

**For large rim spaces, riveted tanks and when wax scrapers are required

ǂCapable of gas tight (TÜV) certification