ND Crushable Mastics


ND Crushable Mastic Sealer is an extruded product that is specially formulated for fastening and sealing operations that require holes and gaps to be filled and sealed. An extruded product, Crushable Mastic Sealer can be formed in a variety of shapes, sizes, and dimensions, and can be applied to your parts by ND Industries.

How it Works

ND Crushable Mastic Sealer is most often used in one of two ways. The most common is that of seal, pre-assembled directly to a fastener. Crushable properties enable it to evenly fill and seal holes, gaps, and other voids in bolts, nuts, stampings, or virtually any other item. Using resources specifically designed for this product, ND Industries is capable of bonding Crushable Mastic Sealer to a variety of substrates. The second most common use is as a loose seal. ND forms the material to specifications and the end user or assembler places the seal on the gap, prior to torquing the fastener into place.



Crushable Mastic Sealer can be extruded in a wide range of diameters, lengths, and durometers.

Heat Resistant

Unlike many other automotive sealers, Crushable Mastic Sealer can be exposed to temperatures of up to 400° F without losing its sealing qualities.

Complete Fill & Seal

Unlike plastic, rubber, and other washer materials which often fail to seal completely when torqued into place, Crushable Mastic Sealer is crushable and consistently provides reliable gap filling and sealing.

No Application Tooling

Crushable Mastic Sealer requires no special tools for application by the end user.

Long Shelf Life

Crushable Mastic Sealer is stable, with a long shelf life.

Does Not Stain

Crushable Mastic Sealer will not stain metal, fabric, or other surfaces.


  • Saves Time: Crushable Mastic Sealer is easy to incorporate into high-volume production functions and can be applied with a minimum of time and effort.
  • Saves Money: Crushable Mastic Sealer costs less than silicone and provides high-quality gap filling and sealing, even in high temperature applications.
  • Easy to Use: Crushable Mastic Sealer requires minimal employee training for efficient use.
  • Meets Automotive Specs: Crushable Mastic Sealer meets specifications for the “Big Three” automakers.


  • Crushable Mastic Sealer is stable, with a long shelf life.
  • ND can specially formulate Crushable Mastic Sealer to meet customer specifications (e.g. – penetrometers, tolerances, etc.). ND will work with you to produce extremely low tolerances – lower than any other crushable mastic supplier.

ND Crushable Mastics Competes With



Automotive Floor Boards, Firewall, Sound Deadening, Interior applications, Automotive Gaskets, Automotive Washers, drain plugs

Technical Data

Attribute/ProductND M97ND 505ND 600
DescriptionNon-reactive, crushable mastic washers for sealing against moisture, air, and dust.Injection molded or die-cut parts that do not require expansion. Similar formula to ND 500 without expansion.Injection molded or die-cut parts that need fluid and temperature resistance. Able to withstand harsh automotive environments.
Competes WithL&L Products: L1030,
Forest City Technologies: FC-XE-16,
Chemseco: 3002
Specific Gravity1.841.311.35
Hardness Shore A408575
Needle Penetrometer3.5 mm2.1 mm1.1 mm
Water Absorption0.50%.30%.20%
Solids Content99%99%99%
Product Sold asWashersPellets,
Die-Cut Parts,
9¾" Wide Roll
Die-Cut Parts,
9¾" Wide Roll
Spec. Meets or ExceedsMS-CD69, GM1131M A/B, WSS-M4G87-BGM9984193C


Particular formulations of ND Crushable Mastics meet or exceed the performance requirements of the following specifications and/or standards:

Spec ForSpec NumberND ProcessND Material
Fiat ChryslerMS-CD69Crushable MasticsND M97

Safety, Technical & Product Data Sheets

Process NameMaterialSafety Data Sheet (Applied)Technical Data Sheet (Applied)Process Data Sheet
ND Crushable Mastic SealerND 505Crushable Mastics - PDS
ND Crushable Mastic SealerND 600ND3274Crushable Mastics - PDS
ND Crushable Mastic SealerND M97ND2130M97 - TDS (Applied)Crushable Mastics - PDS
Increase product quality while saving time and money with Pre-Applied adhesives and sealants.