Loctite 638

50,25181,05

Loctite 638 is designed for the bonding of cylindrical fitting parts, particularly where bond gaps can approach 0.25 mm and where maximum strength at room temperature is
required. The product cures when confined in the absence of air between close fitting metal surfaces and prevents loosening and leakage from shock and vibration. Typical applications
include locking bushings and sleeves into housings and on shafts.

Loctite 638 provides robust curing performance. It not only works on active metals (e.g. mild steel) but also
on passive substrates such as stainless steel and plated surfaces. The product offers high temperature performance and oil tolerance. It tolerates minor surface contaminations from various oils, such as cutting, lubrication, anti-corrosion and protection fluids.

This product may vary on delivery times.

Minimum Order Quantity: 

  • 50 ml: 12;
  • 250 ml: 1.
SKU: L 638 Categories: , Tags: ,
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Description

NSF International

Registered to NSF Category P1 for use as a sealant where there is no possibilty of food contact in and around food processing areas. Note: This is a regional approval. Please contact your local Technical Service Center for more information and clarification.

TYPICAL PROPERTIES OF UNCURED MATERIAL

  • Specific Gravity @ 25 °C 1.1
  • Flash Point – See SDS
  • Viscosity, Brookfield – RVT, 25 °C, mPa·s (cP):
    • Spindle 3, speed 20 rpm 2,000 to 3,000LMS
  • Viscosity, Cone & Plate, 25 °C, mPa·s (cP):
    • Shear rate 129 s -1 1,900 to 3,100

TYPICAL CURING PERFORMANCE

Cure Speed vs. Substrate

The rate of cure will depend on the substrate used. The graph below shows the shear strength developed with time on steel pins and collars compared to different materials and tested according to ISO 10123.

Cure Speed vs. Bond Gap

The rate of cure will depend on the bondline gap. The following graph shows shear strength developed with time on steel pins and collars at different controlled gaps and tested according to
ISO 10123.

Cure Speed vs. Temperature

The rate of cure will depend on the temperature. The graph below shows the shear strength developed with time at different temperatures on steel pins and collars and tested according to ISO 10123.

Cure Speed vs. Activator

The graph below shows the shear strength developed with time on stainless steel pins and collars using Activator SF 7471™, SF 7649™ and SF 7091™ and tested according to ISO 10123.

Additional information

WeightN/A
Technology

Acrylic

Chemical Type

Urethane methacrylate

Appearance (uncured)

Green liquid

Fluorescence

Positive under UV light

Components

One component – requires no mixing

Viscosity

High

Cure

Anaerobic

Secondary Cure

Activator

Application

Retaining

Strength

High

Quantity

250 ml, 50 ml

Brand

EAN

0818231820348

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