AK Flex Insulation

Name: AK Flex Insulation
Brand: Knauf Insulation

This semi-rigid fiberglass blanket measures 48" (1,219 mm), has a density of 2.5 PCF (40 kg/m³), and comes in roll form. The fiber orientation provides excellent compressive strength while maintaining flexibility for ease of installation.

Applications

Certifications

Product Features

For Pipes & Tanks

Typical uses include tanks, vessels and large-diameter (greater than 10" (25.4 cm)) pipes. It can be used for any curved or irregular surfaces that require finished characteristics of rigid fiberglass insulation.

Versatile

AK Flex is available plain or with a factory applied ASJ or FSK vapor retarder jacket.

Sustainable

All of our products are made from sustainable resources, such as recycled glass and sand.

Product Details

Technical Data


TECHNICAL DATA
PROPERTY (UNIT)	TEST	PERFORMANCE
Corrosiveness	ASTM C665	Does not accelerate corrosion of steel
Maximum Service Temperature	ASTM C411	850° F (454° C)
Linear Shrinkage	ASTM C356	Less than 0.3%
Water Vapor Sorption (by weight)	ASTM C1104	5% or less
Water Vapor Permeance	ASTM E96, Procedure A	0.02 perms (FSK, ASJ facing
Puncture Resistance	TAPPI Test T803, Beach Units	FSK facing: 25, ASJ facing: 50
Compressive Strength	ASTM C165	Not less than 25 PSF (1.2 kPa) at 10% deformation
Mold Growth	ASTM C1338	Pass
Surface Burning Characteristics (flame spread/smoke developed)	ASTM E84, UL 723, CAN/ULC S102	UL/ULC Classified FHC 25/50

Thermal Conductivity k


MEAN TEMPERATURE	K	K(SI)
75° F (24° C)	0.24	0.035
100° F (38° C)	0.25	0.036
200° F (93° C)	0.32	0.046
300° F (149° C)	0.39	0.056
400° F (204° C)	0.49	0.070
500° F (260° C)	0.61	0.088

Forms Available

FORMS AVAILABLE
THICKNESS	WIDTH	LENGTH
1" (25 mm)	48" (1,219 mm)	52' (15.85 m)
1½" (38 mm)		30' (9.14 m)
2" (51 mm)		26' (7.92 m)
2½" (64 mm)		21' (6.40 m)
3" (76 mm)		18' (5.48 m)
4" (102 mm		10' (3.05 m)

Stretch-outs

STRETCH-OUTS \| ADDITIONAL 2" (51 mm) TO 4" (102 mm) SHOULD BE ADDED FOR LAP
NOMINAL IRON PIPE SIZE	IRON PIPE OUTSIDE DIAMETER	THICKNESS
NOMINAL IRON PIPE SIZE	IRON PIPE OUTSIDE DIAMETER	1" (25 mm)	1^1/2" (38 mm)	2" (51 mm)	3" (76 mm)
10" (254 mm)	10^_3/4" (273 mm)	40¹ ⁄8" (1019 mm)	43^1/4" (1099 mm)	46^3/8" (1178 mm)	52^5/8" (1337 mm)
12" (305 mm)	12^3/4" (324 mm)	46³ ⁄8" (1178 mm)	49^1/2" (1257 mm)	52^_3/4" (1340 mm	59" (1499 mm)
14" (356 mm)	14" (356 mm)	50³ ⁄8" (1280 mm)	53^1/2" (1359 mm)	56^5/8" (1438 mm)	62^7/8" (1597 mm
16" (406 mm)	16" (406 mm)	56⁵ ⁄8" (1438 mm)	59^_3/4" (1518 mm)	62^7/8" (1597 mm)	69^_1/8" (1756 mm
18" (457 mm)	18" (457 mm)	62⁷ ⁄8" (1597 mm)	66" (1676 mm)	69^1/4" (1756 mm	75^1/2" (1918 mm)
20" (508 mm)	20" (508 mm)	69¹ ⁄8" (1756 mm)	72^3/8" (1838 mm)	75^1/2" (1918 mm)	81^3/4" (2076 mm)
22" (559 mm)	22" (559 mm)	75¹/2" (1918 mm)	78^5/8" (1997 mm)	81^3/4" (2076 mm)	88" (2235 mm)
24" (610 mm	24" (610 mm	81³/4" (2076 mm)	84^7/8" (2156 mm)	88" (2235 mm)	94^3/8" (2397 mm)
26" (660 mm)	26" (660 mm)	88" (2235 mm)	91^1/8" (2315 mm)	94^3/8" (2397 mm)	100^5/8" (2556 mm)
28" (711 mm)	28" (711 mm)	94³ ⁄8" (2397 mm)	97^1/2" (2477 mm)	100^5/8" (2556 mm)	106^7/8" (2715 mm)
30" (762 mm)	30" (762 mm)	100⁵ ⁄8" (2556 mm)	103^3/4" (2635 mm)	106^7/8" (2715 mm	113^1/8" (2873 mm
32" (813 mm)	32" (813 mm)	106⁷ ⁄8" (2715 mm)	110" (2794 mm)	113^1/8" (2873 mm)	119^1/2" (3035 mm)
34" (864 mm)	34" (864 mm)	113¹ ⁄8" (2873 mm)	116^1/4" (2953 mm)	119^1/2" (3035 mm)	125^3/4" (3194 mm)
36" (914 mm)	36" (914 mm)	119¹/2" (3035 mm	122^5/8" (3115 mm)	125^3/4" (3194 mm)	132" (3353 mm)
38" (965 mm)	38" (965 mm)	125³/4" (3194 mm)	128^7/8" (3273 mm)	132" (3353 mm)	138^1/4" (3512 mm)
40" (1016 mm)	40" (1016 mm	132" (3353 mm)	135^_1/8" (3432 mm)	138^1/4" (3512 mm)	144^5/8" (3673 mm
42" (1067 mm)	42" (1067 mm)	138¹/4" (3512 mm)	141^_1/2" (3594 mm)	144^5/8" (3673 mm)	150^7/8" (3832 mm)