When setting out to find the best High Modulus Low Shrink (HMLS) polyester, it is important to know and understand the key physical properties you are looking for. The table below contains a list of some of the largest HMLS polyester yarn producers with a list of specifications for different types of their standard 1000 Denier HMLS polyester yarns.
HMLS Filament Polyester Yarn General Specifications Compared
| Fiber Producer | Type | Denier | Denier Range | Filament Count | Breaking Strength (lbs) |
Tenacity (g/d) |
Elongation at Break % |
Elongation at 10 lbs % |
Hot Air Shrinkage % |
| Hailide | HM1091 | 1000 | +/- 27 | 335 | 17.5 | 7.9 | 13.5 +/- 2.0 | 6.0 +/- 0.8 | 2.5 +/- 1.0A |
| Akra | 161ST-2 | 1017 | +/- 27 | 212 | 18.2 | 8.2 | 13.5 +/- 2.5 | 7.8 +/- 1.2 | 1.8 +/- 0.6B |
| Unifull | SFD | 1000 | na | 320 | 17.8 | 8.2 | 12.0 +/- 2.0 | 5.2 +/- 0.8 | 3.0 +/- 0.5C |
| Durafiber | 1X50 | 1000 | na | 330 | 17.4 | 7.8 | 10 | 5.1 | 3.8 +/- 0.8C |
| GXD | G1003T | 1018 | +/- 15 | 320 | 18.1 | 8.4 | 12.0 +/- 2.0 | 5.5 +/- 0.8 | 3.0 +/- 1.0D |
*A- Hot Air Shrinkage measured at 177C x 10 minutes with 0.05cN/dtex
*B- Hot Air Shrinkage measured at 180C x 1minutes with 9 g
*C- Hot Air Shrinkage measured at 177C x 2 minutes with 0.05cN/dtex
*D- Hot Air Shrinkage measured at 177C x 1 minutes with 0.05cN/dtex
What are the benefits of HMLS polyester?
First, what is High Modulus Low Shrink (HMLS) Polyester? As a material it is extremely tear resistant, however has elastic, temperature and dimensional stability. These properties are due to the polymer being more crystalline than its High Tenacity (HT) counterparts. While HMLS yarn typically has less tenacity than a standard HT polyester, it maintains a similar elongation while keeping heat shrinkage low.
Due to HMLS's unique properties (greater elasticity and dimensional stability), it is desirable in the production of hoses, automotive tires, cord fabrics, conveyors and v-belts for the mechanical rubber goods industry. The low shrinkage is beneficial because when the rubber is vulcanized and exposed to heat, it doesn’t shrink and reduce the overall size of the final product like a standard HT polyester would. When compared to a typical low shrink or super low shrink yarn, the elongation of HMLS materials is much lower which allows for higher working pressures in various hose types.
As the table indicates, there is very little variation between the major producers of HMLS polyester in the general physical properties measured. Other factors including availability, service, spin finish, and package wind quality are often the deciding factor in choosing the best choice for a particular processing application.
While there are many different types of polyester, the table above only lists some of the industrial yarn suppliers of HMLS 1000 Dn polyester. These yarns often need to be further processed through twisting, winding and/or single-end coated or treated to be used in product applications. See our list of yarn converters for help.
Let us know if you need help determining the best polyester for your application!
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