S-LEC® Polyvinyl Acetal Resin

S-LEC® is a polyvinyl acetal resin comprising three chemical units: acetyl unit, hydroxyl unit and acetal unit.

Polyvinyl alcohol (PVOH) is the raw material of S-LEC®. Manufacturers add caustic soda and other substances to polyvinyl acetate, a resin commonly used as a base material of gum, to create PVOH. This raw material reacts with aldehyde to produce a polyvinyl acetal resin: SEKISUI S-LEC®.

S-LEC Chemical Units Graphic

A main feature of S-LEC® is providing various effects by controlling bonding and releasing at the molecular level.

In addition to its three main benefits — toughness, adhesiveness and dispersibility — S-LEC® provides a variety of other advantages to solve issues in new product development. These advantages include leveling properties to achieve smooth, flat material surfaces and moldability to create strong, flexible molded products.

Find more technical information about S-LEC® here.

To stay up to date on new product updates, please visit our HPPC TECHs blog.

S-LEC® Grades and Physical Properties

Low-Molecular-Weight Type
Grade
Type
Volatiles
Mw
Viscosity
Hydroxyl content
Acetyl content
Acetal content
Tg
5wt% 10wt%
(%) ×10⁴ (mPa・s) (mol%) (wt%) (mol%) (wt%) (mol%) (wt%) (℃)
BL-10 P 3 or less 1.5 9 ~ 15 Approx. 28 Approx. 19 3 or less 4 or less Approx. 70 Approx. 78 67
BL-1 P 3 or less 1.9 10 ~ 30 Approx. 36 Approx. 26 3 or less 4 or less Approx. 63 Approx. 73 70
BL-1H P 3 or less 2.0 10 ~ 30 Approx. 30 Approx. 21 3 or less 4 or less Approx. 69 Approx: 78 68
BL-S P 3 or less 2.3 10 ~ 30 Approx. 23 Approx. 16 4 ~ 6 5 ~ 7 Approx. 72 Approx: 78 66
BL-2H P 3 or less 2.8 25 ~ 55 Approx. 30 Approx. 21 3 or less 4 or less Approx. 69 Approx: 78 70
BL-5Z Z 3 or less 3.2 30 ~ 50 Approx. 21 Approx. 14 3 or less 4 or less Approx. 77 Approx: 83 67
BL-7Z Z 3 or less 3.9 50 ~ 90 Approx. 30 Approx. 21 3 or less 4 or less Approx. 69 Approx: 78 71
Medium-Molecular-Weight Type
Grade
Type
Volatiles
Mw
Viscosity
Hydroxyl content
Acetyl content
Acetal content
Tg
5wt% 10wt%
(%) ×10⁴ (mPa・s) (mol%) (wt%) (mol%) (wt%) (mol%) (wt%) (℃)
BM-1 P 3 or less 4.0 60 ~ 100 Approx. 34 Approx. 24 3 or less 4 or less Approx. 65 Approx. 75 72
BM-S(Z) P/Z 3 or less 5.5 80 ~ 150 Approx. 23 Approx. 16 4 ~ 6 5 ~ 7 Approx. 72 Approx. 78 67
BM-2(Z) P/Z 3 or less 5.2 100 ~ 180 Approx. 30 Approx. 21 3 or less 4 or less Approx. 69 Approx. 78 71
BM-SHZ Z 3 or less 5.8 110 ~ 190 Approx. 23 Approx. 16 3 or less 4 or less Approx. 77 Approx. 83 68
BM-5 P 3 or less 5.6 140 ~ 220 Approx. 34 Approx. 24 3 or less 4 or less Approx. 65 Approx. 75 73
High-Molecular-Weight Type
Grade
Type
Volatiles
Mw
Viscosity
Hydroxyl content
Acetyl content
Acetal content
Tg
5wt% 10wt%
(%) ×10⁴ (mPa・s) (mol%) (wt%) (mol%) (wt%) (mol%) (wt%) (℃)
BH-S P 3 or less 6.6 20 ~ 40 Approx. 23 Approx. 16 4 ~ 6 5 ~ 7 Approx. 72 Approx. 78 67
BH-A P 3 or less 11.5 35 ~ 65 Approx. 27 Approx. 18 11 ~ 15 15 ~ 9 Approx. 60 Approx. 65 65
BH-6 P 3 or less 9.2 40 ~ 90 Approx. 30 Approx. 21 3 or less 4 or less Approx. 69 Approx. 78 73
BH-3(Z) P/Z 3 or less 11.0 60 ~ 120 Approx. 34 Approx. 24 3 or less 4 or less Approx. 65 Approx. 75 74
Heat-Resistant Type
Grade
Type
Volatiles
Mw
Viscosity
Hydroxyl content
Acetyl content
Acetal content
Tg
5wt% 10wt%
(%) ×10⁴ (mPa・s) (mol%) (wt%) (mol%) (wt%) (mol%) (wt%) (℃)
BX-L P 3 or less 1.8 10 ~ 30 Approx. 32 Approx. 25 3 or less 4 or less Approx. 67 Approx. 74 80
BX-1 P 3 or less 10.0 70 ~ 140 Approx. 27 Approx. 21 3 or less 4 or less Approx. 72 Approx. 78 95
BX-5(Z) P/Z 3 or less 13.0 130 ~ 200 Approx. 27 Approx. 21 3 or less 4 or less Approx. 72 Approx. 78 92
High-Heat-Resistant Type
Grade
Type
Volatiles
Mw
Viscosity
Hydroxyl content
Acetyl content
Acetal content
Tg
5wt% 10wt%
(%) ×10⁴ (mPa・s) (mol%) (wt%) (mol%) (wt%) (mol%) (wt%) (℃)
KS-10 P 3 or less 1.7 10 ~ 30 Approx. 25 Approx. 20 3 or less 4 or less Approx. 74 Approx. 78 105
KS-1 P 3 or less 2.7 65 ~ 95 Approx. 25 Approx. 20 3 or less 4 or less Approx. 74 Approx. 78 107
KS-6Z Z 3 or less 10.8 110 ~ 170 Approx. 25 Approx. 20 3 or less 4 or less Approx. 74 Approx. 78 113
KS-5Z Z 3 or less 13.0 210 ~ 270 Approx. 25 Approx. 20 3 or less 4 or less Approx. 74 Approx. 78 113

Note
Shape: P = Particulate, Z = Granule
Viscosity: Ethanol/toluene = 1/1 solution (Measurement instrument: BM Type rotary viscometer/Measurement temperature: 20ºC)
*The values above are not specifications.

Products

Selvol Polyvinyl Alcohol
Selvol Ultalux
Selvol Ultiloc
Selvol Premiol
S-LEC B/K Polyvinyl Acetal Resins
Advancell Thermo-Expandable Microspheres